Co-reporter:Hong-Yan Lü, Xiao-Hua Zhang, Fang Wan, Dao-Sheng Liu, Chao-Ying Fan, Huan-Mei Xu, Guang Wang, and Xing-Long Wu
ACS Applied Materials & Interfaces April 12, 2017 Volume 9(Issue 14) pp:12518-12518
Publication Date(Web):March 27, 2017
DOI:10.1021/acsami.7b01986
In this work, a flexible and self-supporting P-doped carbon cloth (FPCC), which is composed of interwoven mesh of hollow microtubules with porous carbon walls, is prepared via a vacuum-sealed doping technology by employing the commercially available cotton cloth as sustainable and scalable raw material. When directly used as binder-free anode for sodium-ion batteries, the as-prepared FPCC delivers superior Na-storage properties in terms of specific capacity up to 242.4 mA h g–1, high initial Coulombic efficiency of ∼72%, excellent rate capabilities (e.g., 123.1 mA h g–1 at a high current of 1 A g–1), and long-term cycle life (e.g., ∼88% capacity retention after even 600 cycles). All these electrochemical data are better than the undoped carbon cloth control, demonstrating the significance of P-doping to enhance the Na-storage properties of cotton-derived carbon anode. Furthermore, the technologies of electrochemical impedance spectroscopy and galvanostatic intermittent titration technique are implemented to disclose the decrease of charge transfer resistance and improvement of Na-migration kinetics, respectively.Keywords: anode; binder free; carbon cloth; flexible; phosphorus doping; sodium ion batteries;
Co-reporter:Dehua Li, Alexis Munyentwali, Guang Wang, Meiduo Zhang, Shuangxi Xing
Dyes and Pigments 2015 Volume 117() pp:92-99
Publication Date(Web):June 2015
DOI:10.1016/j.dyepig.2015.02.009
•Photo and temperature responsive amphiphilic diblock copolymer was successfully prepared.•The fluorescence of the polymeric assemblies could be efficiently modulated by a photochromic naphthopyran and temperature.•Such polymeric assemblies could be used as sensitive ratiometric fluorescent thermometers.A dual-responsive amphiphilic diblock copolymer, poly(styrene-co-1-(2-methacryloxyethoxy)-2-(2-pyridyl)benzimidazole)-block-Poly(N-isopropylacrylamide-co-3-biphenyl-3-phenyl-8-methacryloxy-3H-naphtho[2,1-b]pyran-co-4-methamino-9-allyl-1,8-naphthalimide), also denoted as P(St-co-PBI)-b-P(NIPAM-co-NP-co-MANI), was synthesized by reversible addition fragmentation chain transfer polymerization followed by assembling into micelles with hydrophobic P(St-co-PBI) block as core and thermoresponsive P(NIPAM-co-NP-co-MANI) block as the shell in aqueous solution. Dynamic light scattering, transmission electron microscopy and optical transmittance were used to characterize the particle morphology and thermosensitivity of the micelles solution. In addition, the fluorescence emission of the micelles could be reversibly modulated “on” and “off” by the photochromic naphthopyran upon UV and thermal back reaction, which promoted naphthopyran transformation between merocyanine forms and original closed form. Moreover, the spatial distance between the two fluorescence dyes could be regulated by temperature, resulting from the collapse or extension of PNIPAM in aqueous solution. This property enabled the polymeric assemblies to serve as sensitive ratiometric fluorescent thermometers.
Co-reporter:Lihui Liu, Aixia Wang, Guang Wang, Alexis Munyentwari, Yihan Zhou
Journal of Luminescence 2015 Volume 165() pp:159-166
Publication Date(Web):September 2015
DOI:10.1016/j.jlumin.2015.04.026
•A carbazole-substituted photochromic naphthopyran was designed and synthesized.•The fluorescence was enhanced under the existence of DMF and UV irradiation.•The polarity of solvent was the dominating factor to affect the fluorescence.•The new compound also displayed piezochromic performance.A novel carbazole-substituted naphthopyran, 3,3-bis-(4-carbazolylphenyl)-[3H]-naphtho[2,1-b]pyran (CzNP) was designed and synthesized. The new compound exhibited normal photochromism in dichloromethane solution and the UV irradiation did not influence its fluorescence. On the contrary, the fluorescence of CzNP in N,N-dimethylformamide (DMF) was intensively enhanced to 29 times after 60 min of the UV irradiation and this enhanced fluorescence can be quenched by addition of triethylamine (TEA). The study of enhanced extent of fluorescence of CzNP in solvents with different polarities and in mixed solvents demonstrated that the enhanced fluorescence is dependent on the polarity of solvents. The larger the polarity of solvent was, the stronger was the fluorescence of CzNP. CzNP also exhibited piezochromic performance and the pressure led to the cleavage of the C–O bond of pyran ring.
Co-reporter:Lihui Liu, Aixia Wang, Guang Wang, Jianxin Li, Yihan Zhou
Sensors and Actuators B: Chemical 2015 215() pp: 388-395
Publication Date(Web):
DOI:10.1016/j.snb.2015.03.093
Co-reporter:Meiduo Zhang, Dehua Li, Yi He, Guang Wang
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2015 Volume 151() pp:525-531
Publication Date(Web):5 December 2015
DOI:10.1016/j.saa.2015.06.082
•An amphiphilic naphthopyran derivative (DSNP) was designed and prepared.•DSNP can self-assemble into the LBL films with cationic quaternized poly(4-vinylpyridine).•DSNP also assemble into light-responsive micelles with polyethylene glycol–triethylamine bromide.•Naphthopyran displayed a markedly slower fading rate in LBL films.•The photochromic reaction of naphthopyran induced disassembly and re-assembly of micelles.An amphiphilic naphthopyran derivative (DSNP) with negative-charged di-sulfatoethoxy was first designed and synthesized. DSNP was used to prepare the LBL self-assembly films with cationic quaternized poly(4-vinylpyridine) (P4VPQ). The multilayer assembly process was monitored via UV–Vis spectra and the DSNP displayed a significant slow fading rate in film. In addition, DSNP was also used as the light-responsive group to fabricate light-responsive micelles with polyethylene glycol–triethylamine bromide (PEG–NEt3). The photoisomerization of naphthopyran moieties can rapidly and reversibly tune the disassembly and re-assembly of the micelles. The changes of fluorescent spectra of Nile Red (NR) in water solution of polymeric micelles demonstrated that the polymeric micelle can be used as nanocarriers to encapsulate, release and re-encapsulate guest solutes on demand controlling of light irradiation. The results indicate that the amphiphilic naphthopyran can be used in both optical-switches and biomedical area for drug delivery.
Co-reporter:Yu Zhang, Yanfeng Zhang, Guang Wang, Yi He
Dyes and Pigments 2014 Volume 102() pp:107-113
Publication Date(Web):March 2014
DOI:10.1016/j.dyepig.2013.10.043
•The fluorescent photoswitchings based on naphthopyran and pyrene were designed and prepared.•The properties of fluorescent switching were investigated in THF solution and PMMA film.•The polymeric fluorescent switching displayed better switching performance than that of organic dyad.•Pyrene molecules can form excimers in the synthesized polymer molecules.•Photoinduced energy transfer is responsible for the modulation of fluorescence emission.The fluorescent photo-switching systems were prepared based on fluorescent pyrene and photochromic naphthopyran in the forms of organic dyad and copolymer. Naphthopyran in two systems displayed excellent photochromic performance, especially in tetrahydrofuran solution. The fluorescent emission was modulated between “on” and “off” via the photoisomerization of naphthopyran in high-degree, especially in polymer (>90%) due to the photoinduced energy transfer from pyrene excimers to the open-form naphthopyran. Both the fluorescence photoswitching and the photochromism of polymer in solution displayed excellent fatigue resistance. The fluorescent image shows the patterned irradiation of the polymer-doped polymethylmethacrylate film can be recorded by fluorescent pattern on the sample. The non-destructive readout ability of polymer-doped polymethylmethacrylate film was achieved.
Co-reporter:Meiduo Zhang, Dehua Li, Guang Wang, Jianxin Li, Haizhu Sun
Dyes and Pigments 2014 Volume 105() pp:232-237
Publication Date(Web):June 2014
DOI:10.1016/j.dyepig.2014.02.016
•The naphthopyrans are used as light-responsive group to synthesize amphiphilic polymer with poly(ethylene glycol).•The amphiphilic polymer can self-assemble to micelles in aqueous solution.•The photoisomerization of naphthopyrans moieties can tune the disassembly and re-assembly of the micelle fast and reversibly.•Fluorescent dye nile red is used as the fluorescence probe to monitor the encapsulation and release of micelle.The photochromic materials of single-molecule naphthopyrans (NP) are first used as hydrophobic and light-responsive group to synthesize amphiphilic polymer with the poly(ethylene glycol) (PEG) via Click-Chemistry. Such an amphiphilic polymer can self-assemble to light-responsive micelles with NP-core and PEG-shell in aqueous solution, as are confirmed by dynamic light scattering and transmission electron microscopy. The photoisomerization of naphthopyrans moieties can fast and reversibly tune the disassembly and re-assembly of the micelle, as are confirmed by UV–Vis spectroscopy. The changes of fluorescent spectra of nile red (NR) in water solution of polymeric micelle within 60 s demonstrate that the polymeric micelle can be used as nanocarriers to encapsulate, release and re-encapsulate guest solutes on demand controlling of light irradiation. The fast and highly efficient photo-control of polymeric micelles is a potential candidate in biomedical area for drug delivery.
Co-reporter:Dehua Li, Meiduo Zhang, Guang Wang and Shuangxi Xing
New Journal of Chemistry 2014 vol. 38(Issue 6) pp:2348-2353
Publication Date(Web):13 Mar 2014
DOI:10.1039/C3NJ01313H
Novel naphthopyran derivative based photochromic polymer nanoparticles are prepared via miniemulsion copolymerization with methyl methacrylate (MMA) and n-butyl methacrylate (BMA) monomers. The systematic modulation of the photochromic rate can be achieved via tuning the ratio of MMA and BMA monomers to lead the naphthopyrans to swing between rigid and soft surroundings. Transmission electron micrographs (TEM) and dynamic light scattering (DLS) images prove that the nanoparticles are discrete and smooth. The typical spectral characteristics of naphthopyran in the polymer nanoparticles indicate that the photochrome is incorporated into the nanoparticles successfully. In addition, the polymer nanoparticles exhibit good photochromic reversibility and stability upon UV irradiation and thermal back reaction.
Co-reporter:Lihui Liu;Yunfeng Zhang;Meiduo Zhang ;Hongyu Guan
Polymer International 2014 Volume 63( Issue 11) pp:1991-1996
Publication Date(Web):
DOI:10.1002/pi.4750
Abstract
Highly stable merocyanines (MCs) of naphthopyrans based on polyvinylpyrrolidone (PVP) nanofibers have been developed by electrospinning mixtures of PVP and naphthopyran derivatives. The surface and internal features of the electrospun fibers were characterized using scanning electron microscopy and Fourier transform infrared spectroscopy. The naphthopyrans displayed normal photochromic performance in the polymeric fibers and presented high-stability MC forms. The one-dimensional structure of the nanofibers and hydrogen bonds between PVP and MC structures of naphthopyran were responsible for the high degree of stability. The absorption intensities of the most highly stable MC form were 77% compared with the initial intensity after fading for three days. © 2014 Society of Chemical Industry
Co-reporter:Ling Zhu, Caiying Gu, Yi He, Guang Wang
Journal of Luminescence 2014 153() pp: 439-445
Publication Date(Web):
DOI:10.1016/j.jlumin.2014.03.067
Co-reporter:Mei-Duo Zhang, Yan-Feng Zhang, De-Hua Li, Guang Wang and Jian-Xin Li
New Journal of Chemistry 2013 vol. 37(Issue 5) pp:1385-1390
Publication Date(Web):05 Mar 2013
DOI:10.1039/C3NJ41056K
A photochromic polymer film has been fabricated by the layer-by-layer (LBL) self-assembly through alternating the deposition of poly(acrylic acid) bearing a naphthopyran copolymer and poly(4-vinylpyridine) in an organic solvent. The multilayer assembly process is monitored via UV-vis spectroscopy by measuring the increase in absorbance at 380 nm, and the results reveal that the multilayer films grow in a uniform way in each deposition. Atomic force microscopy (AFM) images prove that the surface of the film was relatively smooth. The photochromic properties of the naphthopyran in the LBL films are investigated and the kinetic results confirm that the colored merocyanine in the LBL films show a significant slow fading speed (critical T1/2 decoloration time increased to 64 min in the 3-bilayer film) and are more stable than those in previous reports.
Co-reporter:Xiancai Zhao;Kuo Zhang
Journal of Applied Polymer Science 2013 Volume 127( Issue 3) pp:1794-1802
Publication Date(Web):
DOI:10.1002/app.37913
Abstract
Thermoplastic elastomers of styrene–butadiene–styrene (SBS) triblock copolymers containing grafts of naphthopyran as side-chain polymer were prepared by polymerization of naphthopyran acrylate monomer with a solution of SBS in tetrahydrofuran. Thin films of all grafted SBS polymers displayed photochromism, the decoloration kinetics of naphthopyran in the films was modeled by fitting biexponential equations to the photochromic decay curves after UV light irradiation. Stretching of the grafted SBS film at room temperature affected the fading rate constant k1 of the naphthopyran. The length of linker between photochromic naphthopyran moiety and the acrylate unit in monomer also affected the fading rate constant k1 of the naphthopyran in SBS elastomers. This study presents an example of tuning the photochromic properties of naphthopyran via two approaches, polymer structure, and stretching of films. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Co-reporter:Shuangqing Wang, Yanling Si, Cuiyan Tong, Guang Wang, Bin Qi, Guochun Yang
Optical Materials 2013 Volume 35(Issue 8) pp:1504-1512
Publication Date(Web):June 2013
DOI:10.1016/j.optmat.2013.03.010
•A novel fluorescent photochromic switching unit has been synthesized.•Fluorescence was switched “on–off” reversibly by the photochromism of naphthopyran.•The quenching mechanism was investigated by experiments and DFT calculations.•The potential application of the molecule in non-destructive readout was studied.A naphthopyran-bridge-benzimidazole dyad which exhibits both fluorescence and photochromism was synthesized and its fluorescence photoswitching was investigated. Irradiation with UV light induces the isomerization of the naphthopyran component to the corresponding merocyanine. The fluorescence of the dyad was switched reversibly between on and off upon UV irradiation and thermal bleaching of the naphthopyran. Using ultraviolet illumination a pattern was created on a polymethylmethacrylate doped film with the dyad. Thus either a non-destructive photoswitch or an image recording system becomes available. The measurement of redox potentials by cyclic voltammetry combined with electronic spectra and a molecular energy diagram of the individual naphthopyran and benzimidazole demonstrated that the transformation of naphthopyran induced energy and electron transfer from the fluorescent benzimidazole to the photochromic naphthopyran, a feature which was also supported by our DFT calculations.Graphical abstract
Co-reporter:Min Li, Musa Tarawally, Xi Liu, Xiaoling Liu, Liping Guo, Li Yang, Guang Wang
Talanta 2013 Volume 109() pp:1-6
Publication Date(Web):15 May 2013
DOI:10.1016/j.talanta.2013.03.035
•A cyclodextrin-modified gold-nanoparticles is demonstrated as chiral stationary phase in monolith CEC.•The performance of enantioselective monolithic column was investigated.•Enantioselective monolithic column exhibits good reproducibility and excellent stability.•The method was successfully applied for chiral separation of drug enantiomers.β-cyclodextrin modified gold nanoparticles (CD-GNP) were employed as the stationary phase in monolith capillary electrochromatography (CEC) to facilitate enantioseparation. CD-GNP were covalently bound to the surface of the thiolated porous polymer monolithic column. The fabricated enantioselective monolithic column was characterized by a variety of spectroscopic methods. The column exhibited steady EOF mobility over pH values ranging from 4.6 to 9.7. Additionally, the column was stable under CEC separation conditions over 180 min. Moreover, the column exhibited good column-to-column reproducibility. The CD-GNP-modified monolithic column was employed in the efficient CEC separation of three pairs of drug enantiomers (chlorpheniramine, zopiclone and tropicamide). The results exhibit reproducible run-to-run enantioseparations and the monolith column can maintain its enantioselectivity for more than 1 month if the column is stored in a CD-GNP solution at 4 °C.
Co-reporter:Xiancai Zhao;Kuo Zhang
Journal of Applied Polymer Science 2012 Volume 124( Issue 5) pp:4157-4164
Publication Date(Web):
DOI:10.1002/app.35427
Abstract
Photochromic polymer films were prepared by doping the naphthodipyran into different polymers such as Polyvinylpyrrolidone (PVP), styrene-butadiene-styrene (SBS) triblock copolymer, and polymethyl methacrylate (PMMA) at different concentrations. The kinetics of the photochromism/decoloration in the thin films was quantified by fitting biexponential equations to their photochromic decay curves after UV irradiation. The results show that the fastest decoloration process was in SBS, and the slowest one was in PVP. The DSC results indicate that Tg of polymeric matrix has no obvious effect on the decoloration rate of naphthodipyran. The decreasing order of the decoloration constant of naphthodipyran was consistent with increasing polarity of polymer matrixes as PVP > PMMA > SBS. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Co-reporter:Lizhen Chen, Guang Wang, Xiancai Zhao
Journal of Luminescence 2011 Volume 131(Issue 8) pp:1617-1620
Publication Date(Web):August 2011
DOI:10.1016/j.jlumin.2011.03.066
A fluorescence switch based on photoisomerization of naphthopyran (NP) has been designed by employing 2-(pyridin-2-yl)-benzimidazole (BPI) and the naphthopyran containing two pyran rings (NP) as fluorescent dye and photochromic compound, respectively. The fluorescence switch of benzimidazole derivative can be modulated either by controlling the irradiation time of UV light or by adjusting the amount ratio of fluorescent benzimidazole derivative to photochromic naphthopyran in both solution and polymethyl methacrylate (PMMA) film. The experimental results indicated that the decrease of fluorescence intensity of benzimidazole derivative is attributed to the interaction of benzimidazole with naphthopyran.Highlights► Naphthopyran was first used to fabricate fluorescence switch with benzimidazole derivative. ► Fluorescence intensity can be modulated by controlling the UV irradiation time. ► Fluorescence intensity can be adjusted by changing the ratio of benzimidazole derivative to naphthopyran. ► Decrease of fluorescence intensity is attributed to the interaction of benzimidazole derivative and naphthopyran.
Co-reporter:Bingjie Xie;Xiancai Zhao
Journal of Applied Polymer Science 2011 Volume 122( Issue 5) pp:3377-3382
Publication Date(Web):
DOI:10.1002/app.34427
Abstract
Naphthopyran homopolymer and copolymer containing coumarin in side chain were synthesized by atom transfer radical polymerization. Their photochromic properties were investigated using UV–vis absorption spectroscopy and their decoloration kinetics in films was quantified by biexponential fitting of their photochromic decoloration curves after UV irradiation. The results showed that the photochromism and photocrosslinking occurred simultaneously under UV irradiation, and the photocrosslinking of coumarin reduced the decoloration rate of naphthopyran. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.
Co-reporter:Guang Wang, Yi He, Li Yang, Bin Qi
Journal of Luminescence 2009 Volume 129(Issue 10) pp:1192-1195
Publication Date(Web):October 2009
DOI:10.1016/j.jlumin.2009.05.018
A new structural dinuclear aluminum 8-hydroxyquinoline complex (DAlq3) with two aluminum chelate-center was designed and synthesized. It was assessed as light-emitting material in organic light-emitting device (OLED). The green light emission was observed in films and OLEDs. DAlq3 has better electron mobility and also shows a higher electroluminescence (EL) efficiency than that of aluminum 8-hydroxyquinoline (Alq3).
Co-reporter:Dan Gu, Guochun Yang, Yi He, Bin Qi, Guang Wang, Zhongmin Su
Synthetic Metals 2009 Volume 159(23–24) pp:2497-2501
Publication Date(Web):December 2009
DOI:10.1016/j.synthmet.2009.08.040
A triphenylamine-containing pH chemosensor, N,N′-di[3-(diphenylamine)benzyl]-piperazine, was designed and synthesized with Ullmann reaction. The compound crystallize in the monoclinic space group P21/n: a = 9.8004(12) Å, b = 13.3321(17) Å, c = 12.9575(16) Å, β = 103.510(2)°, V = 1646.2(4) Å3, Z = 2 and ρ = 1.212 Mg/m3. The synthesized compound excited by UV light produce intensive emission and a quantum yield of 0.56 relative to quinine sulfate was achieved. The fluorescence intensity of synthesized compound in water/DMF (4:1, v/v) under excitation of 307 nm decreased with the decrease of pH, experimental and computational studies further confirmed that the protonation of N-triphenylamine leads to the fluorescence quenching. The results clearly indicate the potential of synthesized compound as highly efficient “on–off” switcher for protons.
Co-reporter:Guang Wang, Yi He
Materials Letters 2009 Volume 63(3–4) pp:470-472
Publication Date(Web):15 February 2009
DOI:10.1016/j.matlet.2008.11.012
New oxadiazole complex with bipolar ligand, Zn(POTPA)2, was designed and synthesized, and used as an emitter material in single-layer organic electroluminescent (EL) devices (OLED). The UV absorbance of Zn(POTPA)2 is caused by electron π–π⁎ transition. Zn(POTPA)2 exhibited strong blue luminescence in solution and film. Compared with triphenylamine and 2,5-diphenyl-1,3,4-oxadiazole, cyclic voltammograms exhibited that Zn(POTPA)2 has bipolar properties, and the optical band gap energy, Eg, calculated based on the cyclic voltammograms is nearly equal to that deduced from the absorption spectrum. Single-layer device with the structure of ITO/Zn(POTPA)2/Mg:Ag were fabricated and blue electroluminescence was observed with a maximum luminance of 271 cd/m2 and efficiency of 0.46 cd/A.
Co-reporter:Guang Wang, Yi He, Lixiang Wang
Materials Letters 2008 Volume 62(17–18) pp:2611-2614
Publication Date(Web):30 June 2008
DOI:10.1016/j.matlet.2007.12.070
Co-reporter:Guang Wang, Xiao Liang Zhao, Yue Zhao
Chinese Chemical Letters 2008 Volume 19(Issue 5) pp:521-524
Publication Date(Web):May 2008
DOI:10.1016/j.cclet.2008.01.043
A liquid crystalline gelator containing the azobenzene chromophore was synthesized for the first time; it was used to form self-assembled network in nematic liquid crystals resulting in liquid crystal gels with distinct features.
Co-reporter:G. Wang;J. P. Zhang;L. X. Wang;X. B. Jing;F. S. Wang
Journal of Applied Polymer Science 2003 Volume 88(Issue 1) pp:50-53
Publication Date(Web):23 JAN 2003
DOI:10.1002/app.12021
A luminescent bipolar polymer containing 1,3,4-oxadiazole and triphenylamine has been synthesized. A smooth and dense thin film of polymer is easily obtained by spin coating its chloroform solution. This film exhibits a strong blue fluorescence under the irritation of ultraviolet (UV) light. The synthesized polymer possesses a high glass transition temperature (Tg) of 167°C. A single-layer electroluminescence (EL) device indium-tin oxide (ITO)/polymer/Mg:Ag emitted blue light with a turn-on voltage of 13 V. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88:50–53, 2003
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