Co-reporter:Huanhuan Wang, Enwei Zhu, Jiazhi Yang, Peipei Zhou, Dongping Sun, and Weihua Tang
The Journal of Physical Chemistry C June 21, 2012 Volume 116(Issue 24) pp:13013-13019
Publication Date(Web):May 25, 2012
DOI:10.1021/jp301099r
Bacterial cellulose (BC) nanofiber-supported polyaniline (PANI) nanocomposites have been synthesized via in situ polymerization of aniline onto BC nanofibers scalfold. Optimized preparation conditions were employed to achieve higher conductivity. The resultant BC/PANI nanocomposites were fully characterized in terms of structure, morphology, and thermal stability. The flake-like morphology of BC/PANI nanocomposites was observed using a field-emission gun scanning electron microscope. By manipulating the ordered flake-type nanostructure, BC/PANI nanocomposites achieved outstanding electrical conductivity as high as 5.1 S/cm. The as-prepared BC/PANI nanocomposites demonstrated a mass-specific capacitance of 273 F/g at 0.2 A.g–1 current density in supercapacitor application, the highest value reported so far for polymer-supported PANI composites.
Co-reporter:Ping Deng, Jiangsheng Yu, Xinxing Yin, Yongliang Geng, Baojing Zhou, Fujun Zhang, Weihua Tang
Dyes and Pigments 2017 Volume 138(Volume 138) pp:
Publication Date(Web):1 March 2017
DOI:10.1016/j.dyepig.2016.11.015
•The synthesis of bisalkylthiobenzo[1,2-b:4,5-b′]dithiophene based polymers.•The electrochemical characterization and molecular simulation of polymers.•The effect of bisalkylthio side chains on BDT polymer properties.•The highest PCE of 5.82% for PBDTT-DS2-BTff based OPVs.The length and conformation of solubilizing side chains in π-conjugated polymers impact polymers' self-assembling properties in thin-film devices. To reveal the effect of different bisalkylthio side chains, four copolymers containing bisalkylthio side chain modifying two-dimensional benzo[1,2-b:4,5-b′]dithiophene (BDT) donor with (5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole (BDff) acceptor have been developed and studied in this report. The different absorption maxima (λmax) of PBDTT-DS1-BTff, PBDTT-DS2-BTff, PBDTT-DS3-BTff and PBDTT-DS4-BTff are 578, 574, 591 and 594 nm in CHCl3 solution, respectively, indicating different aggregation behaviors. The devices based on PBDTT-DS1-BTff didn't reveal high PCEs due to its poor miscibility with PC71BM compared to those with other polymers. The devices blending PBDTT-DS2-BTff with PC71BM exhibited a highest PCE of 5.82%, with an enhanced JSC of 11.06 mA cm−2, a VOC of 0.92 V and a FF of 57.2%. This work demonstrates that suitable side chain lengths in π-conjugated polymers are of great significance in optimizing the performance of polymers based solar cells.Download high-res image (285KB)Download full-size image
Co-reporter:Jiangsheng Yu, Yuyin Xi, Chu-Chen Chueh, Jing-Qi Xu, Hongliang Zhong, Francis Lin, Sae Byeok Jo, Lilo D. Pozzo, Weihua Tang, Alex K.-Y. Jen
Nano Energy 2017 Volume 39(Volume 39) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.nanoen.2017.07.031
•An alcohol-soluble organic CDIN-based electron-transporting layer has been exploited in various inverted organic photovoltaics.•Effective enhancements of the various photovoltaic performance can be achieved by using CDIN-based electron-transporting layer.•A high PCE of 11.17% can be realized in the state-of-the-art fullerene-based organic photovoltaics.In this work, an alcohol-soluble, low-temperature processable and relatively thickness insensitive electron-transporting layer (ETL) comprising a planar coronene derivative, CDIN, was exploited to effectively enhance the photovoltaic performance of various inverted organic photovoltaics (OPVs). Besides the decent charge-transporting property, such CDIN ETL was manifested to facilitate the face-on orientation of atop bulk-heterojunction (BHJ) layers as evidenced by GIWAXS analysis, which might benefit from its discotic geometry endowed with strong face-on π–π stacking in solid-states and better compatibility to the constituent organic photoactive components. Consequently, an enhancement of over 9% in PCE can be achieved in the state-of-the-art fullerene-based OPVs to yield a PCE of 11.2% while over 13% enhancement can be realized in the representative non-fullerene OPVs to yield a PCE of 9%.An alcohol-soluble, low-temperature processable and relatively thickness-insensitive organic CDIN-based electron-transporting layer (ETL) has been exploited to effectively enhance the photovoltaic performance of various inverted organic photovoltaics (OPVs). Owing to its discotic geometry endowed with strong face-on π–π stacking in solid state and better compatibility to the constituent organic photoactive components, a high PCE of 11.17% can be achieved in the state-of-the-art fullerene-based OPVs.Download high-res image (207KB)Download full-size image
Co-reporter:Jie Zhou, Yun Liu, Jian Tang, Weihua Tang
Materials Today 2017 Volume 20, Issue 7(Issue 7) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.mattod.2017.02.006
Featuring size-tunable electrical and optical properties, semiconductor quantum dots (QDs) are appealing intensive interests in developing ingenious luminescent materials for chemosensory and biological applications. The surface modification of QDs with functional ligands not only fine-tunes the physiochemical properties and fluorescence emission behaviors, but also induces the designated interplay between analytes and probes for special determination. In this review, the fundamental principles guiding the rational design of high-efficiency luminescent sensors with surface engineering are overviewed. The state-of-the-art applications of QDs-based probes are highlighted for the sensing of molecular substrates and ionic species as well as various biological applications, with the inherent recognition mechanisms elaborated for representative cases. The challenge and future research direction in this emerging and promising research field are also discussed.
Co-reporter:Zhongsheng Xu, Guoping Luo, Jiangsheng Yu, Xinxing Yin, Enwei Zhu, Fujun Zhang, Hongbin Wu and Weihua Tang
Polymer Chemistry 2016 vol. 7(Issue 7) pp:1486-1493
Publication Date(Web):28 Dec 2015
DOI:10.1039/C5PY01632K
Two donor–acceptor alternating polymers of bis(octylthio)thienyl benzo[1,2-b:4,5-b′]dithiophene (BDTTs) and fluorinated benzo[c][1,2,5]thiadiazole (fBT) or 5-dodecylthienyl-6-fluorobenzo[c][1,2,5]thiadiazole were designed for organic photovoltaic applications. The polymers displayed strong absorptions in the range of 300–650 nm and bandgaps of ∼1.60 eV. Bulk-heterojunction solar cells of PBDTTs-fBT and (6,6)-phenyl C71-butyric acid methyl ester (PC71BM) blends exhibited a maximum power conversion efficiency of 6.27%. Experimental results and theoretical modelling were correlated to reveal the impact of substitution on fluorinated BT on the optoelectronic properties of the resulting polymers.
Co-reporter:Jian Tang, Limin Pang, Jie Zhou, Shaopeng Zhang, Weihua Tang
Analytica Chimica Acta 2016 Volume 946() pp:96-103
Publication Date(Web):23 November 2016
DOI:10.1016/j.aca.2016.10.015
•3-Chloro-4-methyl functionality enhanced enantioselectivities for CD clicked stationary phases.•Correlation study of chromatography separation with molecular simulation.•Enantioseparation of 39 racemates in multimode HPLLC.In this work, a detail study has been performed on the enantioselectivity of per(3-chloro-4-methyl)phenylcarbamate-β-CD clicked chiral stationary phase (CSP) in high-performance liquid chromatography. Both normal phase and polar organic mobile phases have been explored for the enantioseparation of 39 model racemic pairs including aromatic alcohols, flavonoids, β-blockers and amino acids. Chiral resolution values over 10 were achieved for flavonoids. The comparison study with reference perphenylcarbamate-β-CD clicked CSP reveals the significance of 3-chloro-4-methyl functionality in improving the enantioselectivities. This study may provide insight on the multiple interactions between functionalized CD and analytes.
Co-reporter:Jiangsheng Yu, Guanqun Ding, Jiefeng Hai, Enwei Zhu, Xinxing Yin, Zhongsheng Xu, Baojing Zhou, Fujun Zhang, Wanli Ma and Weihua Tang
Physical Chemistry Chemical Physics 2016 vol. 18(Issue 11) pp:7978-7986
Publication Date(Web):16 Feb 2016
DOI:10.1039/C5CP07942J
Four isostructural donor–acceptor alternating polymers of benzodithiophene (BDT)/naphthodifuran (NDF) and benzoselenadiazole (BSe)/benzothiadiazole (BT) have been developed and evaluated for organic photovoltaics. The substitution of one-atom (Se for S) in the accepting units exerts remarkable impact on the optoelectronic properties of polymers. Extended absorption, narrowed bandgap and higher HOMO energy levels were observed for Se-containing polymers in comparison to their S-containing counterparts. Theoretical calculations confirmed the measurable effect on energy levels as found in experimental studies. Bulk-heterojuction solar cells based on the BDT–BSe copolymer and [6,6]-phenyl-C71-butyric acid methyl ester (1:2, w/w) blend films deliver the best PCE of 5.40%. BSe-based polymers showed enhanced photovoltaic performances than BT-based polymers. The device performance is found to be strongly dependent on the processing conditions and morphology of the active layers.
Co-reporter:Yun Liu, Jie Zhou, Jian Tang, and Weihua Tang
Chemistry of Materials 2015 Volume 27(Issue 20) pp:7034
Publication Date(Web):September 30, 2015
DOI:10.1021/acs.chemmater.5b03060
Flexible energy storage systems have recently attracted great interest for portable electronic devices. The functionalization of graphene provides vast platform in tailoring its nanostructure and properties for energy storage via facile processing. Here, we first demonstrate the development of chemically bonded graphene oxide and bacterial cellulose hybrid composite coated with polypyrrole for robust and high-efficiency supercapacitor electrodes. The as-prepared composites exhibited a highest electrical conductivity (1320 S m–1) and the largest volumetric capacitance (278 F cm–3) ever shown by carbon-based electrodes, along with 95.2% retention of 556 F g–1 gravimetric capacitance over 5000 recycling tests in asymmetric supercapacitors. Impressively, the hybrid electrode contributed a 492 F g–1 gravimetric capacitance and 93.5% retention over 2000 recycling in symmetric supercapacitors. The nanostructure and composition of the composites were found to play a crucial role for the performance of these three-dimensional, chemically bonded hybrid composite electrodes.
Co-reporter:Yun Liu, Jie Zhou, Enwei Zhu, Jian Tang, Xiaoheng Liu and Weihua Tang
Journal of Materials Chemistry A 2015 vol. 3(Issue 5) pp:1011-1017
Publication Date(Web):24 Nov 2014
DOI:10.1039/C4TC01822B
Electrode materials with a three-dimensional network structure and high conductivity are crucial for the development of robust high-performance supercapacitors. We report the development of a facile method for the covalent intercalation of graphene oxide (GO) with bacterial cellulose (BC) fibres via a one-step esterification to construct a three-dimensional cross-linked structural scaffold. The as-prepared composite had a tensile strength of 18.48 MPa and an elongation at breakage of 24%. With an outstanding electrical conductivity of 171 S m−1, the composite electrode demonstrates a good mass-specific capacitance of 160 F g−1 at a current density of 0.4 A g−1. A robust supercapacitor was demonstrated with an outstanding capacitance retention of 90.3% over 2000 recycles. The impressive mechanical and electrochemical properties of this covalently intercalated BC/GO composite may open new avenues in developing cross-linked GO nanocomposites for stretchable electronics.
Co-reporter:Linyi Bian, Jiefeng Hai, Enwei Zhu, Jiangsheng Yu, Yun Liu, Jie Zhou, Guidong Ge and Weihua Tang
Journal of Materials Chemistry A 2015 vol. 3(Issue 5) pp:1920-1924
Publication Date(Web):09 Dec 2014
DOI:10.1039/C4TA06140C
A direct synthesis of 4,8-functionalized benzo[1,2-b:4,5-b′]difurans (BDFs) is developed. By fine-tuning the energy levels with different 4,8-functionalities or incorporating with electron-accepting units, BDFs show great potential as organic electronic materials, as demonstrated by 4.61% power conversion efficiency for polymer solar cells.
Co-reporter:Enwei Zhu, Guoping Luo, Yun Liu, Jiangsheng Yu, Fujun Zhang, Guangbo Che, Hongbin Wu and Weihua Tang
Journal of Materials Chemistry A 2015 vol. 3(Issue 7) pp:1595-1603
Publication Date(Web):09 Dec 2014
DOI:10.1039/C4TC02107J
We demonstrated herein the facile synthesis of triisopropylsilylethynyl (TIPS) functionalized benzo[1,2-b:4,5-b′]dithiophene (BDT). Three new TIPSBDT-based donor–acceptor alternating copolymers were further developed by Pd-catalyzed Stille coupling. The effect of accepting unit structure on the optical, electrochemical and energy levels of the polymer was studied. The positive impact of PFN layer, high-boiling solvents processing, polar solvent treatment and solvent annealing on the performance of polymer:PC71BM bulk heterojunction solar cells was revealed. The best devices delivered a power conversion efficiency of 5.46% when blend films processed using o-dichlorobenzene with 3 vol% DIO and treated with the optimization of THF annealing and insertion of PFN layer. The device performance was correlated with the morphology evolution of blend films processed with solvent choice, methanol treatment and THF annealing.
Co-reporter:Zhixing Zhang, Jie Zhou, Yun Liu, Jian Tang and Weihua Tang
Nanoscale 2015 vol. 7(Issue 46) pp:19540-19546
Publication Date(Web):27 Oct 2015
DOI:10.1039/C5NR06073G
Cyclodextrin (CD) capped CdTe quantum dots (QDs) were prepared with uniform dimension (average diameter ∼5 nm) and high quantum yield (ca. 65%). By taking advantage of the inclusion complexation of CD, β-CD-CdTe QDs exhibited strong fluorescence quenching in a linear relationship with the concentration of o-, m- and p-nitrophenol in the range of 20–100 μM. The detection limit reached 0.05 μM for o-/p-nitrophenol and 0.3 μM for m-nitrophenol. The fluorescence decay study revealed the stabilization effect of CD covering on CdTe QDs and fine-tuning of the fluorescence for selective ultrasensitive detection of nitrophenol isomers.
Co-reporter:Yun Liu, Jie Zhou, Enwei Zhu, Jian Tang, Xiaoheng Liu, Weihua Tang
Carbon 2015 Volume 82() pp:264-272
Publication Date(Web):February 2015
DOI:10.1016/j.carbon.2014.10.070
We report the transformation of hydrophilic graphene oxide (GO) sheets into superhydrophobic nanomaterial by direct esterification with epoxy-functionalized polyhedral oligomeric silsesquioxane (ePOSS). The covalently functionalized GO–ePOSS composite shows superhydrophobicity with a water/air contact angle of ∼145°. The highest dispersion limits for GO in selected organic solvents are obtained in the literature. The dispersion of GO–ePOSS can be extended to solvents with Hansen solubility parameters as low as 3.4. Efficient oil–water separation is also demonstrated by using a GO–ePOSS membrane.
Co-reporter:Jie Zhou, Yiying Wang, Yun Liu, Jian Tang, Weihua Tang
Analytica Chimica Acta 2015 Volume 868() pp:73-79
Publication Date(Web):8 April 2015
DOI:10.1016/j.aca.2015.02.013
In this paper, we demonstrate:•The click synthesis of a AC regioisomer cationic cyclodextrin (CD) as chiral selector.•The good enantioselectivities (chiral resolution over 5) for acidic racemates.•The strong chiral recognition of new CD by NMR study.•Baseline enantioseparation of some acidic racemates at CD of 0.5 mM.In this work, a novel methoxypropylamino β-cyclodextrin (β-CD) clicked AC regioisomer, 6A-4-hydroxyethyl-1,2,3-triazolyl-6C-3-methoxypropylamino β-cyclodextrin (HETz-MPrAMCD), was synthesized via nucleophilic addition and click chemistry. The chiral separation ability of this AC regioisomer cationic CD was evaluated toward 7 ampholytic and 13 acidic racemates by capillary electrophoresis. Dependence of enantioselectivity and resolution on buffer pH (5.5–8.0) and chiral selector concentration (0.5–7.5 mM) was investigated. Enantioselectivities (α ≥ 1.05) could be achieved for most analytes under optimal conditions except dansyl-dl-noreleucine and dansyl-dl-serine. The highest resolutions for 2-chloromandelic acid p-hydroxymandelic acid were 15.6 and 9.7 respectively. The inclusion complexation between HETz-MPrAMCD and each 3-phenyllactic acid enantiomer was also revealed with nuclear magnetic resonance study.
Co-reporter:Guidong Ge, Jinan Gu, Jiangsheng Yu, Enwei Zhu, Jiefeng Hai, Linyi Bian, Fujun Zhang, Zhongsheng Xu, Wanli Ma and Weihua Tang
Physical Chemistry Chemical Physics 2015 vol. 17(Issue 12) pp:7848-7856
Publication Date(Web):2015/02/12
DOI:10.1039/C5CP00349K
Three dialkylthio benzo[1,2-b:4,5-b′]dithiophene (S-BDT) based polymers have been developed using different accepting units to tune their bandgaps. The polymer:PC71BM solar cells achieved the highest power conversion efficiency (PCE) of 4.51% without any post-treatment (such as annealing and solvent additive) in conventional single-cell devices. Joint photophysical, electrical and computational studies on the polymer based solar cells revealed the considerable impact of molecular planarity on polymer design. The polymer:PC71BM devices processed with 1,8-diiodooctane for improving their morphology afforded an improved PCE value of 5.63%, with a Voc of 0.83, a Jsc of 10.24 mA cm−2 and a FF of 66.3%.
Co-reporter:Jiangsheng Yu, Baofeng Zhao, Xuemei Nie, Baojin Zhou, Yang Li, Jiefeng Hai, Enwei Zhu, Linyi Bian, Hongbin Wu and Weihua Tang
New Journal of Chemistry 2015 vol. 39(Issue 3) pp:2248-2255
Publication Date(Web):16 Jan 2015
DOI:10.1039/C4NJ02192D
Four π-conjugated benzo[1,2-b:4,5-b′]dithiophene (BDT) based polymers were synthesized for application in polymer solar cells. These polymers possessed desirable HOMO/LUMO levels for polymer photovoltaic applications. PBDTT–TTz and PBDTT–DTBT displayed strong absorption in the range of 300–650 nm, while PBDTT–DPP and PBDTT–TTDPP showed a further 100 nm extended absorption band. The lowest unoccupied molecular orbital energy levels of polymers were tuned effectively from −3.34 eV to −3.81 eV by fusing with different accepting units. A maximum power conversion efficiency of 2.60% was obtained from photovoltaic cells with a PBDTT–TTz:PC61BM (1:2, w/w) blend film as the active layer, with a short circuit current density of 8.37 mA cm−2, an open circuit voltage of 0.70 V, and a fill factor of 44.3%.
Co-reporter:Jian Tang;Limin Pang;Jie Zhou
Journal of Separation Science 2015 Volume 38( Issue 18) pp:3137-3144
Publication Date(Web):
DOI:10.1002/jssc.201500630
The efficient enantioseparation of 26 racemates has been achieved with the perphenylcarbamoylated cyclodextrin clicked chiral stationary phase by screening the optimum composition of mobile phase in high-performance liquid chromatography. The chromatographic results indicate that both the retention and chiral resolution of racemates are closely related to the polarity of the mobile phases and the structures of analytes. The addition of alcohols can significantly tune the enantioseparation in normal-phase high-performance liquid chromatography. The addition of methanol and the ratio of ethanol/methanol or isopropanol/methanol played a key role on the resolution of flavonoids in ternary eluent systems. The chiral separation of flavonoids with pure organic solvent as mobile phase indicates the preferential order for chiral resolution is methanol>ethanol>isopropanol>n-propanol>acetonitrile.
Co-reporter:Jiangsheng Yu, Qiaoshi An, Jiefeng Hai, Xuemei Nie, Baojing Zhou, Fujun Zhang, Weihua Tang
Polymer 2015 Volume 79() pp:12-20
Publication Date(Web):19 November 2015
DOI:10.1016/j.polymer.2015.09.047
•Synthesis of polymers of [1,2,5]thiadiazolo[3,4-g]quinoxaline and BDT and NDF.•Bandgaps of 1.03–1.10 eV for the polymers.•Improved PCE for P3HT devices by doping 9 wt% new polymers.A new strong electron-deficient acceptor unit, 4,9-bis(5-bromothiophen-2-yl)-6,7-bis(5-dodecylthiophen-2-yl)-[1,2,5]thiadiazolo[3,4-g]quinoxaline (TQxT), is designed. Three TQxT based new conjugated polymers have been further developed by alternating with benzo[1,2-b:4,5-b′]dithiophene or naphtho[1,2-b:5,6-b′]difuran. Featuring ultra low bandgaps of 1.03–1.10 eV, these polymers exhibit absorption spectra beyond near-infrared (NIR) region. The polymer:PC71BM (1:2) solar cells deliver a best power conversion efficiency (PCE) of 0.43%. The doping of 9 wt% PBDTT-TQxP into P3HT:PC71BM (1:2) blend, however, leads to a highest PCE of 3.58% for the resultant ternary solar cells, corresponding to ∼22% improvement in comparison to 2.93% PCE for P3HT:PC71BM binary cells.
Co-reporter:Jie Zhou, Jian Tang, Weihua Tang
TrAC Trends in Analytical Chemistry 2015 Volume 65() pp:22-29
Publication Date(Web):February 2015
DOI:10.1016/j.trac.2014.10.009
•The development of cationic cyclodextrins as mobile phases for chiral separation.•The development of structurally defined cationic cyclodextrins for chiral separation.•We summarize approaches to revealing the chiral recognition mechanism.•Exploring cationic cyclodextrin-based stationary phases for chiral separation.Cationic cyclodextrins (CDs) have attracted considerable interest in the field of chiral separation. Targeting effective modulation of the interactions between chiral selectors and analytes for enhanced chiral recognition, a growing library of positively charged CDs has been developed for different analytical techniques. This review updates the research endeavors of synthetic and analytical chemists in evaluating enantioselectivity of cationic CDs using different analytical methods and the study of the chiral recognition mechanism. We pay specific attention to the structurally defined cationic CDs, which have been explored for versatile chiral separation in a variety of techniques when subject to further modification.
Co-reporter:Limin Pang, Jie Zhou, Jian Tang, Siu-Choon Ng, Weihua Tang
Journal of Chromatography A 2014 Volume 1363() pp:119-127
Publication Date(Web):10 October 2014
DOI:10.1016/j.chroma.2014.08.040
•The column characterization of perphenylcarbamated cyclodextrin (CD) clicked chiral stationary phase (CSP).•The enantioseparation 26 recemates with the CD clicked CSP in reversed phase high-performance liquid chromatography.•The detailed correlation study of flow rate, column temperature, organic modifier and buffer on the enantioselectivity of the clicked CSP.•The excellent chiral resolutions readily achieved with the high column efficiency CSP.In this study, perphenylcarbamated cyclodextrin clicked chiral stationary phase (CSP) was developed with high column efficiency. The characteristics of the column were evaluated in terms of linearity, limit of detection and limit of quantification. The enantioselectivity of the as-prepared clicked CSP was explored with 26 recemates including aryl alcohols, flavanoids and adrenergic drugs in reversed phase high-performance liquid chromatography. The effect of separation parameters including flow rate, column temperature, organic modifier and buffer on the enantioselectivity of the clicked CSP was investigated in detail. The correlation study of the analytes structure and their chiral resolution revealed the great influence of analytes’ structure on the enantioseparations with cyclodextrin CSP. Methanol with 1% of triethylammonium acetate buffer (pH 4) was proved to be the best choice for the chiral separation of basic enantiomers.
Co-reporter:Shuye Wang;Yiying Wang;Jie Zhou;Yingying Lu;Jian Tang
Journal of Separation Science 2014 Volume 37( Issue 15) pp:2056-2061
Publication Date(Web):
DOI:10.1002/jssc.201400248
A new member of the family of methoxylalkylamino monosubstituted β-cyclodextrins, mono-6A-(4-methoxybutylamino)-6A-β-cyclodextrin, has been developed as a chiral selector for enantioseparation in capillary electrophoresis. This amino cyclodextrin exhibited good enantioselectivities for 16 model acidic racemates including three dansyl amino acids at an optimum pH of 6.0. Excellent chiral resolutions over six were obtained for α-hydroxy acids and 2-phenoxypropionic acids with 3.0 mM chiral selector. The good chiral recognition for α-hydroxyl acids was attributed to inclusion complexation, electrostatic interactions, and hydrogen bonding. The hydrogen-bonding-enhanced chiral recognition was revealed by NMR spectroscopy. The chiral separation of acidic racemates was further improved with the addition of methanol (≤10 vol%) as an organic additive.
Co-reporter:Jiefeng Hai, Guozheng Shi, Jiangsheng Yu, Enwei Zhu, Linyi Bian, Wanli Ma and Weihua Tang
New Journal of Chemistry 2014 vol. 38(Issue 10) pp:4816-4822
Publication Date(Web):17 Jul 2014
DOI:10.1039/C4NJ00639A
Four new alternating copolymers of naphthodifuran and quinoxaline have been developed. With the bandgap as low as 1.2 eV, polymers exhibited extended absorption to 1200 nm. Their potential in bulk heterojunction solar cells was evaluated. With device optimization, triazoloquinoxaline based polymers contributed the highest power conversion efficiency of 0.84%.
Co-reporter:Jie Zhou, Yun Liu, Yingying Lu, Jian Tang and Weihua Tang
RSC Advances 2014 vol. 4(Issue 97) pp:54512-54516
Publication Date(Web):24 Sep 2014
DOI:10.1039/C4RA06279E
Novel AC regioisomer cationic cyclodextrins have been successfully prepared with azide/alkyne click chemistry. The clicked CDs were explored for the enantioseparation of acidic racemates in capillary electrophoresis.
Co-reporter:Guangqiang Han, Yun Liu, Erjun Kan, Jian Tang, Lingling Zhang, Huanhuan Wang and Weihua Tang
RSC Advances 2014 vol. 4(Issue 20) pp:9898-9904
Publication Date(Web):31 Jan 2014
DOI:10.1039/C3RA47764A
The rational preparation of hierarchical MnO2/polypyrrole (PPy)/reduced graphene oxide (rGO) nanosheets in a sandwich structure is presented. By co-assembly of MnO2/GO and PPy/GO into layer-by-layer architecture and reduction of GO, ternary (MnO2, PPy)/rGO composites were first fabricated. The materials were fully characterized in terms of structure, morphology and electrochemical properties. The unique architecture offers the composites good capacitance by taking advantage of the strong synergistic effect of each component. A maximum specific capacitance as high as 404 F g−1 was obtained for this composite electrode. And over 91% of the initial capacitance was retained after 5000 continuous cycles. The good electrochemical performance and long-term cycling stability make this approach attractive in developing multifunctional hierarchical composites for high-performance supercapacitors.
Co-reporter:Linyin Bian, Jingsheng Miao, Jiefeng Hai, Enwei Zhu, Jiangsheng Yu, Guidong Ge, Hongbin Wu and Weihua Tang
RSC Advances 2014 vol. 4(Issue 96) pp:53939-53945
Publication Date(Web):02 Oct 2014
DOI:10.1039/C4RA07644C
Four benzotrithiophene (BTT) based donor–acceptor polymers have been prepared by alternating with diketopyrrolopyrrole (DPP), thiazolo[5,4-d]thiazole (TTz), thieno[3,4-c]pyrrole-4,6-dione (TPD) and thiadiazolo[3,4-g]quinoxaline (DTBTQx). The BTT-based polymers possess good solubility in common organic solvents and excellent thermal stability. PBTTDPP and PBTTDTBTQx possessed an optical bandgap of 1.27 eV and 1.20 eV, with absorption spectra extending to the near-infrared region. The bulk-heterojunction solar cells delivered a highest PCE of 1.39%, with a short circuit current of 5.46 mA cm−2, an open-circuit voltage of 0.51 V and a fill factor of 0.50.
Co-reporter:Yun Liu, Enwei Zhu, Linyi Bian, Jiefeng Hai, Jian Tang, Weihua Tang
Materials Letters 2014 Volume 118() pp:188-191
Publication Date(Web):1 March 2014
DOI:10.1016/j.matlet.2013.12.073
•Graphene dispersions with perylene-cored amphiphlic hyperbranched polyglycidol.•Intercalating of polyglycidol into multilayer graphene structures.•Stable dispersion properties in both water and DMF even for over 2 months.Novel amphiphilic perylene-polyglycidol was successfully prepared for graphene dispersion. The intercalating of polyglycidol into graphene multilayers was achieved via π–π interactions between perylene core and multilayer graphene structure. The hybrid composite exhibits stable dispersion properties in both water and DMF even for over 2 months.
Co-reporter:Weihua Tang;Rui Zhang;Beibei Liu;Huilin Yuan
Journal of Applied Polymer Science 2014 Volume 131( Issue 4) pp:
Publication Date(Web):
DOI:10.1002/app.39944
ABSTRACT
Perflurosulfonated ionomers membranes with different ionic-exchange capacity were successfully fabricated via melt-extruding and casting of their –SO2F precursors. A systematical investigation of the thermal stability, crystallinity, and rheological properties of the precursors was performed to secure their optimized processing conditions. The tensile properties of acid-form membranes are found to increase with base-hydrolysis time, where a tensile strength of 38.2 MPa is readily obtained after 24 h's base-hydrolysis. The content of –SO2F or –SO3H containing side-chains plays an important role in the thermal stability, rheological, and mechanical properties of the precursor or the acid-form membranes. The strong ionic interactions, attributed to the –SO3H groups, lead to decreased crystallinity and tensile strength for different IEC membranes. The acid-form membranes exhibit good proton conductivity and low methanol crossover in comparison with reference Nafion membrane. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39944.
Co-reporter:Weihua Tang;Xuejiao Guo;Dapeng Li;Enwei Zhu;Huilin Yuan
Journal of Applied Polymer Science 2014 Volume 131( Issue 11) pp:
Publication Date(Web):
DOI:10.1002/app.40299
ABSTRACT
Simultaneously reinforced and toughened PPO/HIPS/SEBS/glass fiber (GF) 60/40/5/30 composites were successfully prepared with GF as reinforcing agent and SEBS as toughener. The formulation of PPO/HIPS/SEBS/GF quaternary composites was stepwise optimized by evaluating the effect of GF and SEBS on the processing, mechanical and thermal properties of the composites. The synergistic effects of GF reinforcement and elastomer toughening are attributed to high performance PPO/HIPS/SEBS/GF composites. Among the four elastomers studied, SEBS exhibited as effective toughener for PPO/HIPS matrix and the resulted PPO/HIPS/SEBS/GF composites presented a good combination of mechanical and thermal properties. The optimized PPO/HIPS/SEBS/GF 60/40/5/30 quaternary composites displayed a tensile strength of 123.6 MPa, a bending strength of 149.7 MPa, an unnotched impact strength of 46.6 KJ/m2 and a heat distortion temperature of 148.9°C. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40299.
Co-reporter:Jian Tang, Yingying Lu, Yiying Wang, Jie Zhou, Weihua Tang
Talanta 2014 Volume 128() pp:460-465
Publication Date(Web):1 October 2014
DOI:10.1016/j.talanta.2014.06.006
•The synthesis of a new cationic single-isomer cyclodextrin (CD) as complexation chiral selector.•The good enantioselectivity (chiral resolution over 7) for amino acids.•Theoretical calculation of the binding constants for complexes of cationic CD and amino acids enantiomers.•Enantioseparation ability comparison for three cationic CDs.A new single-isomer cationic cyclodextrin, mono-6A-[3-(3-methoxypropyl)imidazol-1-ium]-6A-β-cyclodextrin chloride, has been synthesized and successfully used for the chiral separation of dansyl amino acids in capillary electrophoresis. With methoxy functionality, the new cationic cyclodextrin exhibits significantly improved enantioselectivities. Excellent enantioseparations for amino acids are obtained in chiral selector concentration range between 2.5 mM to 15 mM at pH 6.0. Chiral resolution as high as 7.3 was achieved for Dns-Aca with 5 mM chiral selector. Comparison study and theoretical calculation with Wren’s model attribute the enhanced enantioseparation to the stronger inclusion complexation between amino acids and cyclodextrin. The binding constants for dansyl amino acids and the cationic cyclodextrins are calculated to be 173–253 M−1, while the optimum cyclodextrin concentrations were estimated to be 4.1–7.6 mM.
Co-reporter:Jiefeng Hai, Wei Yu, Enwei Zhu, Linyi Bian, Jian Zhang, Weihua Tang
Thin Solid Films 2014 Volume 562() pp:75-83
Publication Date(Web):1 July 2014
DOI:10.1016/j.tsf.2014.03.087
•The design of low bandgap polymers of benzo[1,2-b:4,5-b′]dithiophene with fused thiadazole quinoxalines•Polymers with an extremely low bandgap of ~ 1.2 eV, extending the absorption to 1100 nm for films•Polymer solar cells with a 0.52% power conversion efficiencyTwo copolymers comprised of different fused thiadiazole electron withdrawing units and benzo[1,2-b:4,5-b′]dithiophene electron donating unit have been synthesized by Stille reaction. The structural, optical, electrochemical and photovoltaic properties of the copolymers were investigated. Both copolymers in the film state exhibited abroad absorption spectra with an extremely low bandgap of ~ 1.2 eV. Bulk heterojunction solar cells were further fabricated and the best device delivered a power conversion efficiency of 0.52% when thermal annealed at 90 °C.
Co-reporter:Huanhuan Wang, Linyi Bian, Peipei Zhou, Jian Tang and Weihua Tang
Journal of Materials Chemistry A 2013 vol. 1(Issue 3) pp:578-584
Publication Date(Web):22 Oct 2012
DOI:10.1039/C2TA00040G
Core–sheath structured conductive nanocomposites were prepared by wrapping a homogenous layer of polypyrrole (PPy) around bacterial cellulose (BC) nanofibers via in situ polymerization of self-assembled pyrrole. By manipulating the ordered core–sheath nanostructure, BC/PPy nanocomposites were achieved and outstanding electrical conductivity as high as 77 S cm−1 was obtained with the optimized reaction protocols, i.e., feeding mass ratio of BC/Py 1:10, molar ratio of FeCl3/Py 0.5:1, molar ratio of HCl/Py 1.2:1, volume ratio of DMF–H2O 1:2, reaction temperature 0 °C, and reaction time 6 h. The BC/PPy nanocomposites demonstrated promising potential for supercapacitors, with a highest mass specific capacitance hitting 316 F g−1 at 0.2 A g−1 current density. The whole-optimized protocol in preparing highly conductive PPy/BC composites may be readily extended to the preparation of new conductive materials based on core–sheath structured BC nanocomposites for various technological applications.
Co-reporter:Yun Liu, Huanhuan Wang, Jie Zhou, Linyi Bian, Enwei Zhu, Jiefeng Hai, Jian Tang, Weihua Tang
Electrochimica Acta 2013 Volume 112() pp:44-52
Publication Date(Web):1 December 2013
DOI:10.1016/j.electacta.2013.08.149
Hierarchical plush polypyrrole (PPy) layers intercalated graphene sheets have been prepared by in-situ intercalative chemical polymerization. The as-prepared graphene/PPy nanocomposites have been successfully characterized in terms of composition, morphology, and electrochemical properties. It was found that the chemically modified graphene nanosheets and in-situ polymerized PPy layers formed uniform nanocomposites with homogeneous PPy layers intercalated between the graphene substrates. Such uniform nanostructure together with the observed high conductivities (the highest 1980 S m−1) afforded the graphene/PPy composites with high specific capacitance and good cycling stability during the charge–discharge process when used as supercapacitor electrodes. The graphene/PPy (with optimized composition 10:1) based supercapacitors display intriguing performance with a maximum specific capacitance of 650 F g−1 at 0.45 A g−1 current density, a highest energy density of 54.0 W h kg−1 at 1 mA current, and a highest power density of 778.1 W kg−1 at 5 mA current. Furthermore, the graphene/PPy supercapacitor exhibits an excellent cycling stability with 95% specific capacitance retained after 5000 cycles. The impressive results presented here may open the window for grapheme/PPy composites for their promising applications in high energy density storage system.Hierarchical graphene/polypyrrole nanocomposites were prepared via in-situ polymerization of self-assembled pyrrole. The composites achieved outstanding conductivity ∼1980 S cm−1 and demonstrated promising potential in supercapacitor, with a mass-specific capacitance hitting 650 F g−1 at 0.45 A g−1 current density.
Co-reporter:Qiaoshi An, Fujun Zhang, Jian Zhang, Weihua Tang, Zixuan Wang, Lingliang Li, Zheng Xu, Feng Teng, Yongsheng Wang
Solar Energy Materials and Solar Cells 2013 Volume 118() pp:30-35
Publication Date(Web):November 2013
DOI:10.1016/j.solmat.2013.07.050
•The PCE of ternary blend BHJ PSCs was increased to 2.48%, with 27% improvement compared with the control PSCs.•The improvement of PCE is attributed to the balance between photon harvest and charge carrier transport.•The ternary blend BHJ PSCs provides a simple method to widen spectral response range.The performance of polymer solar cells (PSCs), based on poly(3-hexylthiophene) (P3HT) and [6,6]phenyl-C71-butyric acid methyl ester (PC71BM), were improved by adding poly[(4,8-bis-(2-ethylhexyloxy)-benzo[1,2-b:4,5-b′](dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)-thieno[3,4-b]thiophene)-2,6-diyl] (PBDTTT-C). The absorption region of the ternary blend films is extended into near infrared region (NIR). Power conversion efficiency (PCE) of the ternary blend PSCs is improved to 2.48% with 6% PBDTTT-C, which is 27% higher than the binary blend PSCs. The dominant mechanism for the PCE improvement could be attributed to the well balance between photon harvest and charge carrier transport by doping proper concentration PBDTTT-C. The energy transfer or charge carrier transfer directly between P3HT and PBDTTT-C was investigated, which are found to be positive for the performance improvement of ternary blend PSCs.
Co-reporter:Yang Liu, Fujun Zhang, Haidao Dai, Weihua Tang, Zixuan Wang, Jian Wang, Aiwei Tang, Hongsheng Peng, Zheng Xu, Yongsheng Wang
Solar Energy Materials and Solar Cells 2013 Volume 118() pp:135-140
Publication Date(Web):November 2013
DOI:10.1016/j.solmat.2013.08.013
•The PCE of solution-processed small molecular solar cells (SMSCs) arrives to 2.68%.•The roughness of MoO3 increases the interfacial area between anode and active layer.•JscVoc, and FF of cells with MoO3 as anode interfacial layer are improved about 54.7%, 26.9%, and 23.5%.A series of solution-processed small molecular solar cells (SMSCs) were fabricated with 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl] (DIB-SQ) and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) as the active layer. The cells with MoO3 as anode interfacial layer and LiF as cathode interfacial layer have the maximum power conversion efficiency (PCE) 2.68%, with short circuit density (Jsc) of 8.2 mA/cm2, open circuit voltage (Voc) of 0.9 V and fill factor (FF) of 36.3% under 100 mW/cm2 illumination intensity. The key parameters, including JscVoc, and FF of cells with MoO3 as anode interfacial layer and LiF as cathode interfacial layer, are improved about 54.7%, 26.9%, and 23.5% compared with these of cells using PEDOT:PSS as anode interfacial layer and LiF as cathode interfacial layer. The underlying reasons are mainly attributed to the effect of MoO3 layer on charge carrier collection and morphology of active layer. The effect of illumination intensity on the performance of cells was also discussed in detailed.
Co-reporter:Shuye Wang, Yun Dai, Jianhua Wu, Jie Zhou, Jian Tang, Weihua Tang
Journal of Chromatography A 2013 Volume 1277() pp:84-92
Publication Date(Web):15 February 2013
DOI:10.1016/j.chroma.2012.12.045
Methoxyethylamine monosubstituted β-cyclodextrin, mono-6A-(2-methoxyethyl-1-ammonium)-6A-β-cyclodextrin chloride (MEtAMCD), is synthesized and analytically characterized. Bearing a methoxy group in cyclodextrin rim, MEtAMCD exhibits outstanding enantioselectivities toward ampholytic and acidic racemates in capillary electrophoresis. Driven by inclusion complexation, electrostatic interactions and/or hydrogen bonding, the enantioseparation of MEtAMCD is found to be strongly dependent on various separation parameters including buffer pH, cyclodextrin concentration, applied voltage, separation temperature and organic solvent additives. MEtAMCD demonstrates as a versatile cationic chiral selector for the studied 26 acidic and ampholytic enantiomers.Highlights► The synthesis of methoxylamine monosubstituted cyclodextrin (CD) as chiral selector. ► The outstanding enantioseparation abilities toward acidic, ampholytic and even neutral racemates. ► The chiral resolutions of 20 racemates with 2.5 mM CD. ► Full optimization of separation conditions.
Co-reporter:Jiefeng Hai, Enwei Zhu, Linyi Bian, Jin Wang, Zixuan Wang, Yang Li, Liangming Yin, Fujun Zhang, Weihua Tang
European Polymer Journal 2013 Volume 49(Issue 11) pp:3610-3618
Publication Date(Web):November 2013
DOI:10.1016/j.eurpolymj.2013.07.030
Two-dimensional poly[fluorene-alt-bithiophene] backboned copolymers with phenylvinyl bridged accepting side chain exhibit tuned bandgap and absorption spectrum with different accepting units, which may be used as promising electroluminescent materials.Two-dimensional poly[fluorene-alt-bithiophene] backboned copolymers were prepared by introducing phenylvinyl bridged accepting side chain containing malononitrile, 1,3-indanedione, or 4-nitrophenyl acetonitrile accepting moiety. The structural, optical, electroluminescent, electrochemical properties of these polymers were studied in details. These polymers possess good thermal stability and low highest occupied molecular orbital (HOMO) level (−5.59 to 5.67 eV). Results show that the introduction of π-conjugated accepting side chains can effectively adjust the optical and electrochemical properties of the resulting polymers. These new alternating copolymers may be promising electroluminescent materials.Graphical abstract
Co-reporter:X. Yang, R.Z. Wang, Y.C. Wang, C.-X. Sheng, H. Li, W. Hong, W.H. Tang, C.S. Tian, Q. Chen
Organic Electronics 2013 Volume 14(Issue 8) pp:2058-2064
Publication Date(Web):August 2013
DOI:10.1016/j.orgel.2013.04.043
•Polarons exhibit dispersive bimolecular recombination process.•All kinds of polarons are trapped in millisecond time regime.•Recombination of polarons in RR-P3HT/PCBM is weak temperature dependence.•Thermal activation energy for recombination is sensitive to film morphology.We used continuous wave photoinduced absorption (PIA) spectroscopy to investigate long lived polarons in blend of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) and regio-regular poly (3-hexylthiophene) (RR-P3HT), and in blend of PCBM and 2-methoxy-5-(2-ethylhexyloxy) poly(para-phenylenevinylene) (MEH-PPV). In millisecond time regime, delocalized polarons (DP) and localized polarons (LP) in RR-P3HT/PCBM as well as polarons in MEH-PPV/PCBM all exhibit dispersive bimolecular recombination process which was limited by the trap states, with the average lifetimes of those polarons inverse proportional to the square root of pump intensity (I). The recombination in RR-P3HT/PCBM was weak temperature dependence with small thermal activation energy, Δ for DPs and LPs of 25 meV and 13 meV, respectively; in contrast, Δ for polarons in amorphous MEH-PPV/PCBM was ∼160 meV. Furthermore, we proved that the values of Δ for both of LP and DP increase, as well as the relatively intensity ratio of DP and LP decreases, in an intentionally degraded RR-P3HT/PCBM film. Overall, it is demonstrated that steady state photomodulation technique with thermal-activated-recombination analysis can be applied to evaluate polymer (dis)order in bulk heterojunction films.Graphical abstract
Co-reporter:Weihua Tang;Huanhuan Wang;Jian Tang;Huilin Yuan
Journal of Applied Polymer Science 2013 Volume 127( Issue 4) pp:3033-3039
Publication Date(Web):
DOI:10.1002/app.37538
Abstract
Novel compatibilized polyoxymethylene/thermoplastic polyurethane (POM/TPU) blends are successfully developed using multifunctional chain extender, Joncryl ADR-4368, as the compatibilizer. The outstanding compatibilization efficiency of Joncryl on POM/TPU blend was demonstrated by its even higher mechanical properties with only 0.5 wt % of Joncryl than those with 5 wt % of three commonly used compatibilizers. Addition of only 0.5 wt % Joncryl can double the impact strength and significantly improve its tensile strength and flexural strength for POM/TPU (75/25) blend. SEM images show that Joncryl can reduce TPU particle size and enhance the interfacial interactions between POM and TPU. The interparticle distance of TPU in POM/TPU/Joncryl blends was calculated as 0.2 μm, quite close to the critical matrix ligament thickness of POM/TPU blends (0.18 μm). The impact force profile vividly shows that the addition of Joncyl in POM/TPU blends can dramatically increase the total impact energy absorbed by this blend system and enhance the interfacial interactions between POM and TPU. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Co-reporter:Jiefeng Hai;Baofeng Zhao;Enwei Zhu;Linyi Bian;Hongbin Wu
Macromolecular Chemistry and Physics 2013 Volume 214( Issue 21) pp:2473-2479
Publication Date(Web):
DOI:10.1002/macp.201300349
Co-reporter:Jiefeng Hai, Baofeng Zhao, Fujun Zhang, Chuan-Xiang Sheng, Liangming Yin, Yang Li, Enwei Zhu, Linyi Bian, Hongbin Wu, Weihua Tang
Polymer 2013 Volume 54(Issue 18) pp:4930-4939
Publication Date(Web):16 August 2013
DOI:10.1016/j.polymer.2013.07.001
Three novel donor-acceptor polymers have been synthesized with Suzuki cross-coupling between thiophenyl-methylene-9H-fluorene donating unit with thiazolo[5,4-d]thiazole (PFTTTz), benzothiadiazole (PFTODTBT) or [1,2,3]triazolo[4,5-g]quinoxaline (PFTDTBTzQ) accepting unit. The polymer PFTTTz-THF prepared from tetrahydrofuran (THF) presented higher molecular weight and narrower polydiversity than that from toluene (PFTTTz-toluene), leading to higher photovoltaic performance in BHJ devices of these polymers blended with PC71BM ([6,6]-phenyl-C71-butyric acid methyl ester). These good solution processable polymers exhibit a bandgap of 1.66–1.93 eV and a low highest occupied molecular orbital (HOMO) energy level ∼ −5.32 eV. Polymers PFTTTz and PFTODTBT displayed strong absorption in the range of 300–650 nm, while PFTDTBTzQ showed a further 100 nm extended absorption band. Overall efficiencies over 1.5% are achieved for BHJ devices fabricated from blends of PFTTTz with PC71BM as active layer. A maximum power conversion efficiency of 2.21% is obtained by the use of interlayer poly[(9,9-dioctyl-2,7-fluorene)-alt-(9,9-bis(3′-( N, N-dimethylamino)propyl)-2,7-fluorene)] (PFN) and Ca between active layer and Al anode.
Co-reporter:Jie Zhou, Feng Ai, Baojing Zhou, Jian Tang, Siu-Choon Ng, Weihua Tang
Analytica Chimica Acta 2013 800() pp: 95-102
Publication Date(Web):24 October 2013
DOI:10.1016/j.aca.2013.09.021
•The synthesis of a cationic single-isomer cyclodextrin (CD) as chiral selector.•The strong chiral recognition of new CD by NMR study.•The good enantioselectivity (chiral resolution over 5) for acidic and ampholytic racemates.•Enantioseparation ability comparison for four cationic CDs.A novel cationic cyclodextrin, mono-6A-(2-hydroxyethyl-1-ammonium)-6A-β-cyclodextrin chloride (HEtAMCD) has been successfully synthesized and applied as chiral selector in capillary electrophoresis. The NMR study revealed this chiral selector has three recognition sites: β-CD, ammonium cation and hydroxy group in the sidearm to contribute three corresponding driving forces including inclusion complexation, electrostatic interaction and hydrogen bonding. The effect of buffer pH and HEtAMCD concentration (2.5–10 mM) on enantioselectivity, chiral resolution as well as effective mobility of analytes was investigated. This elegantly designed CD exhibits outstanding enantioselectivities toward the studied hydroxyl acids and ampholytic racemates in CE with the aid of extra hydrogen bonding. Under optimum pH 6.0, chiral resolutions over 5 can be readily obtained for hydroxy acids with CD concentration below 5 mM. The comparison study between HEtAMCD and our earlier reported ammonium CDs indicates the hydroxyethylammonium group of HEtAMCD significantly increased the enantioselective capability.
Co-reporter:Linyi Bian, Enwei Zhu, Jian Tang, Weihua Tang, Fujun Zhang
Progress in Polymer Science 2012 Volume 37(Issue 9) pp:1292-1331
Publication Date(Web):September 2012
DOI:10.1016/j.progpolymsci.2012.03.001
The critical review on the recent development of novel narrow bandgap polymers for high-efficiency polymer solar cells concentrates on (i) the structural design of narrow bandgap polymers, which occupy a central place in recent advances in high-efficiency polymer solar cells, (ii) the intrinsic physics and chemistry of special properties, such as absorption, bandgap and energy levels, and (iii) the correlation of polymer structure and device fabrication with their photovoltaic performances. The statistical summaries of their device parameters are also discussed. The description of these structure–property correlations may guide the rational design of polymer structures and the reasonable evaluation of their photovoltaic performance.
Co-reporter:Ren-Qi Wang, Teng-Teng Ong, Weihua Tang, Siu-Choon Ng
Analytica Chimica Acta 2012 Volume 718() pp:121-129
Publication Date(Web):9 March 2012
DOI:10.1016/j.aca.2011.12.063
Co-reporter:Yun Dai, Shuye Wang, Jie Zhou, Yun Liu, Dongping Sun, Jian Tang, Weihua Tang
Journal of Chromatography A 2012 Volume 1246() pp:98-102
Publication Date(Web):13 July 2012
DOI:10.1016/j.chroma.2012.02.065
A novel cationic cyclodextrin, mono-6A-(3-methoxypropan-1-ammonium)-6A-β-cyclodextrin chloride, has been developed and used as chiral selector in capillary electrophoresis (CE). This chiral selector has three recognition sites: β-CD, ammonium cation and methoxy group in the sidearm to contribute three corresponding driving forces including inclusion complexation, electrostatic interaction and hydrogen bonding. This elegantly designed CD exhibits outstanding enantioselectivities in CE for a wide range of acidic and ampholytic racemates due to the extra hydrogen bonding for the chiral recognition. Under optimum pH 6.0, chiral resolutions over 10 can be readily achieved for acidic racemates with CD concentration below 10 mM. This cationic CD exhibits great potential for versatile chiral separation in CE. The finding in this study may be applied to construct new host–guest systems for practical applications.Highlights► The synthesis of a cationic single-isomer cyclodextrin (CD) as chiral selector. ► The strong chiral recognition of new CD by NMR study. ► The outstanding enantioseparation abilities (chiral resolution over 20) towards both acidic and ampholytic racemates. ► Chiral resolutions over 10 readily achieved with 2.5 mM CD.
Co-reporter:Jie Zhou, Yun Dai, Shuye Wang, Enwei Zhu, Jiefeng Hai, Yun Liu, Jian Tang and Weihua Tang
RSC Advances 2012 vol. 2(Issue 12) pp:5088-5093
Publication Date(Web):13 Mar 2012
DOI:10.1039/C2RA20086D
Novel monosubstituted dually cationic cyclodextrins (CDs) have been synthesized by anchoring different alkyl chain spaced imidazolium and ammonium sidearm onto the CD primary ring. These cationic CDs exhibit satisfactory enantioselectivities for amino acids and acidic racemates in aqueous capillary electrophoresis.
Co-reporter:Peipei Zhou, Huanhuan Wang, Jiazhi Yang, Jian Tang, Dongping Sun, and Weihua Tang
Industrial & Engineering Chemistry Research 2012 Volume 51(Issue 16) pp:5743-5748
Publication Date(Web):April 8, 2012
DOI:10.1021/ie300395q
Bacteria cellulose (BC) nanofibers supported palladium(0) nanocomposites were prepared and fully characterized in terms of morphology, crystallinity, composition, and thermal stability. The as-prepared catalyst was further successfully explored in Heck coupling reaction between aryl halide and styrene or acrylates, with a yield over 86–96% for the first coupling reaction. With coupling yields decreased less than 10% for the fifth reaction cycle, Pd/BC catalyst exhibits great potential as recyclable catalyst for Heck coupling.
Co-reporter:Yun Dai, Shuye Wang, Jianhua Wu, Jian Tang and Weihua Tang
RSC Advances 2012 vol. 2(Issue 33) pp:12652-12656
Publication Date(Web):16 Oct 2012
DOI:10.1039/C2RA21940A
Dicationic cyclodextrins with AC regioisomer structure were prepared by monosubstitution of 6A-azido-β-cyclodextrin with 2-mesitylenesulfonyl chloride and the Staudinger reaction. One family of the desired cyclodextrins, the 6A-ammonium-6C-butylimidazolium-β-cyclodextrin chlorides, demonstrated a good chiral recognition ability towards both acidic and even neutral racemates even at concentrations as low as 0.5 mM.
Co-reporter:Peipei Zhou, Huanhuan Wang, Jiazhi Yang, Jian Tang, Dongping Sun and Weihua Tang
RSC Advances 2012 vol. 2(Issue 5) pp:1759-1761
Publication Date(Web):12 Jan 2012
DOI:10.1039/C2RA01015A
Bio-supported Pd nanoparticles were prepared as a robust catalyst for aqueous Suzuki coupling.
Co-reporter:Linyi Bian;Gang Sun;Yuxi Sun
Journal of Physical Organic Chemistry 2012 Volume 25( Issue 12) pp:1112-1118
Publication Date(Web):
DOI:10.1002/poc.2948
A new series of sterically hindered antipyrine derivatives have been synthesized by Schiff base condensation for potential fluorescence sensing applications. Their optical, thermal, and electrochemical properties were fully characterized. Broad absorption spectra were observed as a result of the strong intramolecular charge transfer between antipyrine and sterically hindered conjugated moiety. Reversible one electron oxidation couple was observed for most compounds, with carbazole, phenothiazine, and bithiophene functionalized derivatives exhibiting extra reversible one one-electron oxidation process at higher positive potentials. Cabazole functionalized antipyrine derivative APCZ presents good fluorescence sensing for Co2+ and Cu2+, with 3.41-fold enhancement in fluorescence intensity and 2-fold enhancement in fluorescence quantum yield observed. Copyright © 2012 John Wiley & Sons, Ltd.
Co-reporter:Weihua Tang;Beibei Liu;Zhiwei Liu;Jian Tang;Huilin Yuan
Journal of Applied Polymer Science 2012 Volume 123( Issue 2) pp:1032-1039
Publication Date(Web):
DOI:10.1002/app.34559
Abstract
The electrical resistivity and morphology of high impact polystyrene (HIPS)/styrene-butadiene-styrene triblock copolymer (SBS)/carbon black (CB) blends were studied. Their antistatic sheets were prepared by both compression-molding and extrusion calendaring process, with their surface morphology observed using scanning electron microscopy (SEM). The SEM images reveal better dispersion of CB achieved in extrusion-calendering, resulting in low percolation threshold values in HIPS composites. Higher compression ratio and higher drawing speed (corresponding lower sheet thickness) are beneficial to get better CB dispersion, leading to decreased conductivity for the antistatic sheets. SEM images indicate that strong shear forces in extrusion tend to break the conductive network of CB, resulting in increased surface resistivity. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Co-reporter:Wang Ren-Qi, Ong Teng-Teng, Ng Siu-Choon, Tang Weihua
TrAC Trends in Analytical Chemistry 2012 Volume 37() pp:83-100
Publication Date(Web):July–August 2012
DOI:10.1016/j.trac.2012.02.012
Supercritical fluid chromatography (SFC) has developed rapidly in recent years, particularly in the area of enantioseparations. The merits of SFC (e.g., fast analysis speed, wide polarity compatibility, lower cost of the mobile phase and higher column efficiency) would in many cases make it a better choice than high-performance liquid chromatography in drug discovery for the pharmaceutical industry.Packed-column SFC meets the gradual rise in demand for simultaneous chiral and achiral separations, impurity quantitation and direct scaling up from the pharmaceutical purifications achieved in the laboratory, especially for chiral drugs.This review focuses mainly on the latest examples of pharmaceutical separations with chiral stationary phases in SFC for efficient analyses and preparative-scale purifications.Highlights► We overview SFC applications for analytical and preparative chiral separation. ► We summarize the implementation of CSPs with packed-column SFC. ► We overview the SFC conditions for optimization of enantioseparation. ► We summarize tandem SFC for chiral separation.
Co-reporter:XiaoWei Xu;EnWei Zhu;LinYi Bian;ZiXuan Wang;Jin Wang
Science Bulletin 2012 Volume 57( Issue 9) pp:970-975
Publication Date(Web):2012 March
DOI:10.1007/s11434-011-4964-3
We studied the luminescent and photovoltaic properties of poly(9,9-dioctylfluorene-co-bithiophene) (F8T2) based on ITO/PEDOT:PSS/F8T2/Bphen/LiF(0 or 1 nm)/Al and ITO/PEDOT:PSS/F8T2:PCBM/Bphen/Al. A stable and bright yellow emission was obtained from polymer F8T2, and the electroluminescence power reached 45 μW at a 15 V driving voltage. Polymer F8T2 shows a broad absorption band from 400 to 500 nm, and has a shorter absorption edge at about 560 nm compared to that of the typical electron donor P3HT (650 nm). The photoluminescence quenching of F8T2 occurs with only a small fraction of blended PCBM due to the effective exciton dissociation at the interface between F8T2 and PCBM. Polymer solar cells (PSCs) using F8T2:PCBM as the active layer show a low power conversion efficiency (PCE) of 0.10% with an open circuit voltage (Voc) of 0.91 V and short circuit current density (Jsc) of 0.23 mA/cm2. The PSCs using F8T2:P3HT:PCBM as the active layer have a Voc of 0.85 V and Jsc of 3.02 mA/cm2, improving the PCE by about 0.90%. We attribute the improved cell performance to the higher number of photons harvested by P3HT molecules.
Co-reporter:Huanhuan Wang, Enwei Zhu, Jiazhi Yang, Peipei Zhou, Dongping Sun, and Weihua Tang
The Journal of Physical Chemistry C 2012 116(24) pp: 13013-13019
Publication Date(Web):May 25, 2012
DOI:10.1021/jp301099r
Bacterial cellulose (BC) nanofiber-supported polyaniline (PANI) nanocomposites have been synthesized via in situ polymerization of aniline onto BC nanofibers scalfold. Optimized preparation conditions were employed to achieve higher conductivity. The resultant BC/PANI nanocomposites were fully characterized in terms of structure, morphology, and thermal stability. The flake-like morphology of BC/PANI nanocomposites was observed using a field-emission gun scanning electron microscope. By manipulating the ordered flake-type nanostructure, BC/PANI nanocomposites achieved outstanding electrical conductivity as high as 5.1 S/cm. The as-prepared BC/PANI nanocomposites demonstrated a mass-specific capacitance of 273 F/g at 0.2 A.g–1 current density in supercapacitor application, the highest value reported so far for polymer-supported PANI composites.
Co-reporter:Xianghua Lai, Weihua Tang, Siu-Choon Ng
Journal of Chromatography A 2011 Volume 1218(Issue 22) pp:3496-3501
Publication Date(Web):3 June 2011
DOI:10.1016/j.chroma.2011.03.071
Cyclodextrin and its derivatives are widely used as selectors of chiral stationary phases (CSPs) for high performance liquid chromatography (HPLC) due to their unique molecular structure and resolution capability. Three mono(6A-N-(ω-alkenylamino)-6A-deoxy)perphenylcarbamoylated β-cyclodextrin (PICD) based CSPs with different length spacers have been prepared, with their enantioseparation abilities evaluated with 10 model racemates including aromatic alcohols, flavanone compounds, amine and non-protolytic compounds under normal-phase conditions. The effect of spacer length and surface loading on the enantioseparation performance of CSPs is investigated herewith. The results indicate that higher surface loading 6C-PICD displays the best enantioselectivities towards selected racemates under normal-phase conditions.
Co-reporter:Xianghua Lai, Weihua Tang, Siu-Choon Ng
Journal of Chromatography A 2011 Volume 1218(Issue 33) pp:5597-5601
Publication Date(Web):19 August 2011
DOI:10.1016/j.chroma.2011.06.020
Three novel chiral stationary phases (CSPs) were prepared by regioselective chemical immobilization of mono(6A-N-allylamino-6A-deoxy)perphenylcarbamoylated (PICD) α-, β-, and γ-cyclodextrins (CDs) onto silica support via hydrosilylation. Their enantioseparation properties in high performance liquid chromatography (HPLC) were evaluated with a large spectrum of racemates including flavanone compounds, β-adrenergic blockers, amines and non-protolytic compounds. The effect of CD's cavity size on enantioseparation abilities was studied and discussed. The results indicated that CD's surface loading at silica support played an important role in the enantioseparation on these CSPs under normal-phase conditions while inclusion phenomena contributed the major driving force under reverse-phase conditions. As expected, α-PICD demonstrated the best resolutions towards flavonone and most aromatic alcohols under normal-phase conditions with the highest surface loading; while Fujimura's competitive inclusion model can be applied to explain the better enantioseparations towards β-adrenergic blockers, amines and non-protolytic compounds with α- and β-PICD CSPs. γ-PICD CSP showed superior enantioseparation ability for sterically encumbered analytes like flavanone compounds under both normal-phase and reversed phase conditions.
Co-reporter:Weihua Tang;Jian Tang;Huilin Yuan;Riguang Jin
Journal of Applied Polymer Science 2011 Volume 122( Issue 1) pp:461-468
Publication Date(Web):
DOI:10.1002/app.34162
Abstract
New polymer blends of polypropylene random copolymer (PP-R) and poly(ethylene-octene) (POE) were prepared by melt-blending process using a corotating twin-screw extruder. The POE content was varied up to 35%. The toughening efficiency of POE for PP-R was evaluated by the mechanical properties of the resulted PP-R/POE blends. The crystallization behavior and morphology of the blends were also studied. Results show that POE acts as nucleation agent to induce the crystallization of PP-R matrix at higher crystallization temperature. Super-toughened PP-R/POE blends (Izod impact strength more than 500 J/m) can be readily achieved with only 10 wt % of POE. The high toughness of PP-R/POE is attributed to cavitation and shear yielding of matrix PP-R, as revealed by the morphology studies. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Co-reporter:Weihua Tang, Samarendra P. Singh, Kok Haw Ong and Zhi-Kuan Chen
Journal of Materials Chemistry A 2010 vol. 20(Issue 8) pp:1497-1505
Publication Date(Web):04 Jan 2010
DOI:10.1039/B920112B
A novel series of soluble thieno[3,2-b]thiophene (TT) oligomers with alternating TT and bithiophene or fluorene triad architectures have been synthesized for field-effect transistor (FET) applications. Their optical, thermal and electronic properties were investigated using UV-Vis and photoluminescence spectroscopy, thermal gravimetric analysis, and cyclic voltammetry. Compared with α,α′-dihexylsexithiophene (D6HT), these oligomers exhibit blue-shifted absorption spectra, 0.1 eV to 0.3 eV lower than the highest occupied molecular orbital (HOMO) energy levels and accordingly higher ambient stability. Their crystallinity and morphology features of these oligomers were further investigated with X-ray diffraction and atomic force microscopy using vacuum-deposited thin film on Si/SiO2 substrate. Symmetrically structured TT-oligomers including HT2TT, HTTT2, HTTTT and DDFTT exhibit ordered film morphology and promising FET performance with devices fabricated by either vacuum deposition or solution processing techniques. Interestingly, HTTT2 shows interconnected terrace island morphology, which is often observed for pentacene. All p-type transistors show promising performance, with HT2TT demonstrating a hole mobility up to 0.025 cm2V−1s−1 and an on/off current ration ∼1.2 × 103 with vacuum sublimated film deposited on 70 °C substrate.
Co-reporter:Dewei Zhao, Weihua Tang, Lin Ke, Swee Tiam Tan and Xiao Wei Sun
ACS Applied Materials & Interfaces 2010 Volume 2(Issue 3) pp:829
Publication Date(Web):February 26, 2010
DOI:10.1021/am900823b
We present herein efficient bulk heterojunction (BHJ) solar cells via mixing poly[2,7-(9,9-dihexylfluorene)-alt-bithiophene] (F6T2) and 6,6-phenyl C61 butyric acid methyl ester (PCBM) with variable weight ratios. The photo-physics and morphology of F6T2:PCBM blend films and the electrical characteristics of their corresponding single cells were studied in details by changing PCBM concentration. The complete photoluminescence quenching of F6T2 emission occurs with only a small fraction of PCBM blended, demonstrating effective photoinduced charge transfer between F6T2 and PCBM. Morphology images from atomic force microscopy and scanning electron microscopy (SEM) reveal that the phase separation in F6T2:PCBM blend films becomes pronounced with the increase of PCBM concentration, resulting in the increased fill factor from 25.2% (1:1) to 56.9% (1:6). A SEM image also shows the phase separation is within the range of 10 − 20 nm. With the optimized F6T2:PCBM weight ratio (1:2), the single cell exhibits a highest power conversion efficiency of 2.46% due to the balance of light absorption and charge transport. Finally, the polymer-small molecule tandem cells are constructed using F6T2:PCBM BHJ as the bottom cell and copper phthalocyanine (CuPc):fullerene (C60) as the top cell. The open-circuit voltage (Voc) of tandem cell (1.27 V) is equal to the summation of the Voc values of the bottom cell (0.86 V) and the top cell (0.43 V).Keywords: bulk heterojunction; organic solar cell; tandem cell
Co-reporter:Weihua Tang, Jiefeng Hai, Yun Dai, Zongjun Huang, Bingqin Lu, Fei Yuan, Jian Tang, Fujun Zhang
Solar Energy Materials and Solar Cells 2010 94(12) pp: 1963-1979
Publication Date(Web):
DOI:10.1016/j.solmat.2010.07.003
Co-reporter:Linyi Bian, Enwei Zhu, Jian Tang, Weihua Tang, Fujun Zhang
Progress in Polymer Science (September 2012) Volume 37(Issue 9) pp:1292-1331
Publication Date(Web):1 September 2012
DOI:10.1016/j.progpolymsci.2012.03.001
The critical review on the recent development of novel narrow bandgap polymers for high-efficiency polymer solar cells concentrates on (i) the structural design of narrow bandgap polymers, which occupy a central place in recent advances in high-efficiency polymer solar cells, (ii) the intrinsic physics and chemistry of special properties, such as absorption, bandgap and energy levels, and (iii) the correlation of polymer structure and device fabrication with their photovoltaic performances. The statistical summaries of their device parameters are also discussed. The description of these structure–property correlations may guide the rational design of polymer structures and the reasonable evaluation of their photovoltaic performance.
Co-reporter:Yang Liu, Fujun Zhang, Haidao Dai, Weihua Tang, Zixuan Wang, Jian Wang, Aiwei Tang, Hongsheng Peng, Zheng Xu, Yongsheng Wang
Solar Energy Materials and Solar Cells (November 2013) Volume 118() pp:135-140
Publication Date(Web):1 November 2013
DOI:10.1016/j.solmat.2013.08.013
•The PCE of solution-processed small molecular solar cells (SMSCs) arrives to 2.68%.•The roughness of MoO3 increases the interfacial area between anode and active layer.•Jsc Voc, and FF of cells with MoO3 as anode interfacial layer are improved about 54.7%, 26.9%, and 23.5%.A series of solution-processed small molecular solar cells (SMSCs) were fabricated with 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl] (DIB-SQ) and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) as the active layer. The cells with MoO3 as anode interfacial layer and LiF as cathode interfacial layer have the maximum power conversion efficiency (PCE) 2.68%, with short circuit density (Jsc) of 8.2 mA/cm2, open circuit voltage (Voc) of 0.9 V and fill factor (FF) of 36.3% under 100 mW/cm2 illumination intensity. The key parameters, including Jsc Voc, and FF of cells with MoO3 as anode interfacial layer and LiF as cathode interfacial layer, are improved about 54.7%, 26.9%, and 23.5% compared with these of cells using PEDOT:PSS as anode interfacial layer and LiF as cathode interfacial layer. The underlying reasons are mainly attributed to the effect of MoO3 layer on charge carrier collection and morphology of active layer. The effect of illumination intensity on the performance of cells was also discussed in detailed.
Co-reporter:Qiaoshi An, Fujun Zhang, Jian Zhang, Weihua Tang, Zixuan Wang, Lingliang Li, Zheng Xu, Feng Teng, Yongsheng Wang
Solar Energy Materials and Solar Cells (November 2013) Volume 118() pp:30-35
Publication Date(Web):1 November 2013
DOI:10.1016/j.solmat.2013.07.050
•The PCE of ternary blend BHJ PSCs was increased to 2.48%, with 27% improvement compared with the control PSCs.•The improvement of PCE is attributed to the balance between photon harvest and charge carrier transport.•The ternary blend BHJ PSCs provides a simple method to widen spectral response range.The performance of polymer solar cells (PSCs), based on poly(3-hexylthiophene) (P3HT) and [6,6]phenyl-C71-butyric acid methyl ester (PC71BM), were improved by adding poly[(4,8-bis-(2-ethylhexyloxy)-benzo[1,2-b:4,5-b′](dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)-thieno[3,4-b]thiophene)-2,6-diyl] (PBDTTT-C). The absorption region of the ternary blend films is extended into near infrared region (NIR). Power conversion efficiency (PCE) of the ternary blend PSCs is improved to 2.48% with 6% PBDTTT-C, which is 27% higher than the binary blend PSCs. The dominant mechanism for the PCE improvement could be attributed to the well balance between photon harvest and charge carrier transport by doping proper concentration PBDTTT-C. The energy transfer or charge carrier transfer directly between P3HT and PBDTTT-C was investigated, which are found to be positive for the performance improvement of ternary blend PSCs.Download full-size image
Co-reporter:Jiangsheng Yu, Guanqun Ding, Jiefeng Hai, Enwei Zhu, Xinxing Yin, Zhongsheng Xu, Baojing Zhou, Fujun Zhang, Wanli Ma and Weihua Tang
Physical Chemistry Chemical Physics 2016 - vol. 18(Issue 11) pp:NaN7986-7986
Publication Date(Web):2016/02/16
DOI:10.1039/C5CP07942J
Four isostructural donor–acceptor alternating polymers of benzodithiophene (BDT)/naphthodifuran (NDF) and benzoselenadiazole (BSe)/benzothiadiazole (BT) have been developed and evaluated for organic photovoltaics. The substitution of one-atom (Se for S) in the accepting units exerts remarkable impact on the optoelectronic properties of polymers. Extended absorption, narrowed bandgap and higher HOMO energy levels were observed for Se-containing polymers in comparison to their S-containing counterparts. Theoretical calculations confirmed the measurable effect on energy levels as found in experimental studies. Bulk-heterojuction solar cells based on the BDT–BSe copolymer and [6,6]-phenyl-C71-butyric acid methyl ester (1:2, w/w) blend films deliver the best PCE of 5.40%. BSe-based polymers showed enhanced photovoltaic performances than BT-based polymers. The device performance is found to be strongly dependent on the processing conditions and morphology of the active layers.
Co-reporter:Yun Liu, Jie Zhou, Enwei Zhu, Jian Tang, Xiaoheng Liu and Weihua Tang
Journal of Materials Chemistry A 2015 - vol. 3(Issue 5) pp:NaN1017-1017
Publication Date(Web):2014/11/24
DOI:10.1039/C4TC01822B
Electrode materials with a three-dimensional network structure and high conductivity are crucial for the development of robust high-performance supercapacitors. We report the development of a facile method for the covalent intercalation of graphene oxide (GO) with bacterial cellulose (BC) fibres via a one-step esterification to construct a three-dimensional cross-linked structural scaffold. The as-prepared composite had a tensile strength of 18.48 MPa and an elongation at breakage of 24%. With an outstanding electrical conductivity of 171 S m−1, the composite electrode demonstrates a good mass-specific capacitance of 160 F g−1 at a current density of 0.4 A g−1. A robust supercapacitor was demonstrated with an outstanding capacitance retention of 90.3% over 2000 recycles. The impressive mechanical and electrochemical properties of this covalently intercalated BC/GO composite may open new avenues in developing cross-linked GO nanocomposites for stretchable electronics.
Co-reporter:Linyi Bian, Jiefeng Hai, Enwei Zhu, Jiangsheng Yu, Yun Liu, Jie Zhou, Guidong Ge and Weihua Tang
Journal of Materials Chemistry A 2015 - vol. 3(Issue 5) pp:NaN1924-1924
Publication Date(Web):2014/12/09
DOI:10.1039/C4TA06140C
A direct synthesis of 4,8-functionalized benzo[1,2-b:4,5-b′]difurans (BDFs) is developed. By fine-tuning the energy levels with different 4,8-functionalities or incorporating with electron-accepting units, BDFs show great potential as organic electronic materials, as demonstrated by 4.61% power conversion efficiency for polymer solar cells.
Co-reporter:Huanhuan Wang, Linyi Bian, Peipei Zhou, Jian Tang and Weihua Tang
Journal of Materials Chemistry A 2013 - vol. 1(Issue 3) pp:NaN584-584
Publication Date(Web):2012/10/22
DOI:10.1039/C2TA00040G
Core–sheath structured conductive nanocomposites were prepared by wrapping a homogenous layer of polypyrrole (PPy) around bacterial cellulose (BC) nanofibers via in situ polymerization of self-assembled pyrrole. By manipulating the ordered core–sheath nanostructure, BC/PPy nanocomposites were achieved and outstanding electrical conductivity as high as 77 S cm−1 was obtained with the optimized reaction protocols, i.e., feeding mass ratio of BC/Py 1:10, molar ratio of FeCl3/Py 0.5:1, molar ratio of HCl/Py 1.2:1, volume ratio of DMF–H2O 1:2, reaction temperature 0 °C, and reaction time 6 h. The BC/PPy nanocomposites demonstrated promising potential for supercapacitors, with a highest mass specific capacitance hitting 316 F g−1 at 0.2 A g−1 current density. The whole-optimized protocol in preparing highly conductive PPy/BC composites may be readily extended to the preparation of new conductive materials based on core–sheath structured BC nanocomposites for various technological applications.
Co-reporter:Enwei Zhu, Guoping Luo, Yun Liu, Jiangsheng Yu, Fujun Zhang, Guangbo Che, Hongbin Wu and Weihua Tang
Journal of Materials Chemistry A 2015 - vol. 3(Issue 7) pp:NaN1603-1603
Publication Date(Web):2014/12/09
DOI:10.1039/C4TC02107J
We demonstrated herein the facile synthesis of triisopropylsilylethynyl (TIPS) functionalized benzo[1,2-b:4,5-b′]dithiophene (BDT). Three new TIPSBDT-based donor–acceptor alternating copolymers were further developed by Pd-catalyzed Stille coupling. The effect of accepting unit structure on the optical, electrochemical and energy levels of the polymer was studied. The positive impact of PFN layer, high-boiling solvents processing, polar solvent treatment and solvent annealing on the performance of polymer:PC71BM bulk heterojunction solar cells was revealed. The best devices delivered a power conversion efficiency of 5.46% when blend films processed using o-dichlorobenzene with 3 vol% DIO and treated with the optimization of THF annealing and insertion of PFN layer. The device performance was correlated with the morphology evolution of blend films processed with solvent choice, methanol treatment and THF annealing.
Co-reporter:Weihua Tang, Samarendra P. Singh, Kok Haw Ong and Zhi-Kuan Chen
Journal of Materials Chemistry A 2010 - vol. 20(Issue 8) pp:NaN1505-1505
Publication Date(Web):2010/01/04
DOI:10.1039/B920112B
A novel series of soluble thieno[3,2-b]thiophene (TT) oligomers with alternating TT and bithiophene or fluorene triad architectures have been synthesized for field-effect transistor (FET) applications. Their optical, thermal and electronic properties were investigated using UV-Vis and photoluminescence spectroscopy, thermal gravimetric analysis, and cyclic voltammetry. Compared with α,α′-dihexylsexithiophene (D6HT), these oligomers exhibit blue-shifted absorption spectra, 0.1 eV to 0.3 eV lower than the highest occupied molecular orbital (HOMO) energy levels and accordingly higher ambient stability. Their crystallinity and morphology features of these oligomers were further investigated with X-ray diffraction and atomic force microscopy using vacuum-deposited thin film on Si/SiO2 substrate. Symmetrically structured TT-oligomers including HT2TT, HTTT2, HTTTT and DDFTT exhibit ordered film morphology and promising FET performance with devices fabricated by either vacuum deposition or solution processing techniques. Interestingly, HTTT2 shows interconnected terrace island morphology, which is often observed for pentacene. All p-type transistors show promising performance, with HT2TT demonstrating a hole mobility up to 0.025 cm2V−1s−1 and an on/off current ration ∼1.2 × 103 with vacuum sublimated film deposited on 70 °C substrate.
Co-reporter:Guidong Ge, Jinan Gu, Jiangsheng Yu, Enwei Zhu, Jiefeng Hai, Linyi Bian, Fujun Zhang, Zhongsheng Xu, Wanli Ma and Weihua Tang
Physical Chemistry Chemical Physics 2015 - vol. 17(Issue 12) pp:NaN7856-7856
Publication Date(Web):2015/02/12
DOI:10.1039/C5CP00349K
Three dialkylthio benzo[1,2-b:4,5-b′]dithiophene (S-BDT) based polymers have been developed using different accepting units to tune their bandgaps. The polymer:PC71BM solar cells achieved the highest power conversion efficiency (PCE) of 4.51% without any post-treatment (such as annealing and solvent additive) in conventional single-cell devices. Joint photophysical, electrical and computational studies on the polymer based solar cells revealed the considerable impact of molecular planarity on polymer design. The polymer:PC71BM devices processed with 1,8-diiodooctane for improving their morphology afforded an improved PCE value of 5.63%, with a Voc of 0.83, a Jsc of 10.24 mA cm−2 and a FF of 66.3%.
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![(R)-2-[4-(1,3-dihydro-1-oxo-2H-isoindol-2-yl)phenyl]propionic acid](http://img.cochemist.com/ccimg/53100/53086-14-9.png)
![(R)-2-[4-(1,3-dihydro-1-oxo-2H-isoindol-2-yl)phenyl]propionic acid](http://img.cochemist.com/ccimg/53100/53086-14-9_b.png)
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![Thieno[3,2-b]thiophene-2-carbonitrile](http://img.cochemist.com/ccimg/41000/40985-58-8_b.png)
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![Poly[oxy(2,6-dimethyl-1,4-phenylene)]](http://img.cochemist.com/ccimg/25000/24938-67-8.png)
![Poly[oxy(2,6-dimethyl-1,4-phenylene)]](http://img.cochemist.com/ccimg/25000/24938-67-8_b.png)
![1H,3H-Thieno[3,4-c]furan-1,3-dione](/data/chemimg/593900/6007-85-8.png)
![1H,3H-Thieno[3,4-c]furan-1,3-dione](/data/chemimg/593900/6007-85-8_b.png)
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![[R-(R*,R*)-alpha-[1-(methylamino)ethyl]benzyl alcohol hydrochloride](http://img.cochemist.com/ccimg/700/670-40-6_b.png)
![Stannane, 1,1'-[4,8-bis[5-(2-ethylhexyl)-2-thienyl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl]bis[1,1,1-trimethyl-](/data/chemimg/139400/1352642-37-5.png)
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![D-Methionine, N-[[5-(dimethylamino)-1-naphthalenyl]sulfonyl]-](http://img.cochemist.com/ccimg/77500/77481-10-8_b.png)
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![N-{[5-(dimethylamino)naphthalen-1-yl]sulfonyl}norleucine](http://img.cochemist.com/ccimg/77500/77426-56-3_b.png)
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![Serine, N-[[5-(dimethylamino)-1-naphthalenyl]sulfonyl]-](http://img.cochemist.com/ccimg/48200/48196-47-0_b.png)
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![2-Propanol, 1-[(1-methylethyl)amino]-3-(1-naphthalenyloxy)-, (2S)-](/data/chemimg/55200/4199-09-1_b.png)
![2-Propanol, 1-[(1-methylethyl)amino]-3-(1-naphthalenyloxy)-](/data/chemimg/935900/525-66-6.png)
![2-Propanol, 1-[(1-methylethyl)amino]-3-(1-naphthalenyloxy)-](/data/chemimg/935900/525-66-6_b.png)
![Benzo[1,2-b:4,5-b']dithiophene](/data/chemimg/477000/267-65-2.png)
![Benzo[1,2-b:4,5-b']dithiophene](/data/chemimg/477000/267-65-2_b.png)
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![1,2-Benzenediol,4-[(1R)-1-hydroxy-2-[(1-methylethyl)amino]ethyl]-](http://img.cochemist.com/ccimg/100/51-31-0_b.png)
![Benzenemethanol,4-amino-3,5-dichloro-a-[[(1,1-dimethylethyl)amino]methyl]-, (aS)-](http://img.cochemist.com/ccimg/50500/50499-60-0.png)
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