Co-reporter:Yu Sun;Xiaofeng Wu;Long Yuan;Meng Wang;Mei Han;Liqun Luo;Beining Zheng;Keke Huang
Chemical Communications 2017 vol. 53(Issue 16) pp:2499-2502
Publication Date(Web):2017/02/21
DOI:10.1039/C7CC00140A
LaFeO3 films, as photoelectrocatalysts, could be slightly reduced by annealing in an oxygen-deficient atmosphere. The introduced oxygen vacancies increase the electrical conductivity and change their surface band structures which endows LaFeO3 films with a higher oxygen evolution reaction current and a lower overpotential.
Co-reporter:Jinghai Liu, Shuyuan Xie, Zhibin Geng, Keke Huang, Long Fan, Weilei Zhou, Lixin Qiu, Denglei Gao, Lei Ji, Limei Duan, Luhua Lu, Wanfei Li, Suozhu Bai, Zongrui Liu, Wei Chen, Shouhua Feng, and Yuegang Zhang
Nano Letters 2016 Volume 16(Issue 10) pp:6568-6575
Publication Date(Web):September 12, 2016
DOI:10.1021/acs.nanolett.6b03229
Surface defects in relation to surface compositions, morphology, and active sites play crucial roles in photocatalytic activity of graphitic carbon nitride (g-C3N4) material for highly reactive oxygen radicals production. Here, we report a high-efficiency carbon nitride supramolecular hybrid material prepared by patching the surface defects with inorganic clusters. Fe (III) {PO4[WO(O2)2]4} clusters have been noncovalently integrated on surface of g-C3N4, where the surface defects provide accommodation sites for these clusters and driving forces for self-assembly. During photocatalytic process, the activity of supramolecular hybrid is 1.53 times than pure g-C3N4 for the degradation of Rhodamine B (RhB) and 2.26 times for Methyl Orange (MO) under the simulated solar light. Under the mediation of H2O2 (50 mmol L–1), the activity increases to 6.52 times for RhB and 28.3 times for MO. The solid cluster active sites with high specific surface area (SSA) defect surface promoting the kinetics of hydroxide radicals production give rise to the extremely high photocatalytic activity. It exhibits recyclable capability and works in large-scale demonstration under the natural sunlight as well and interestingly the environmental temperature has little effects on the photocatalytic activity.Keywords: graphitic carbon nitride; peroxo polyoxometalate clusters; photocatalysis; supramolecular hybrid; surface defects;
Co-reporter:Fuqin Zheng;Dong Wang;Hairui Fang;Haidong Wang;Meng Wang;Keke Huang;Huanwen Chen
European Journal of Inorganic Chemistry 2016 Volume 2016( Issue 12) pp:1860-1865
Publication Date(Web):
DOI:10.1002/ejic.201501453
Abstract
Controlled crystallization is very important for crystal growth. The electrospray (ES) technique has attracted great interest thanks to its advantages of facile manipulation of micrometer droplets and the generation of fine and charged droplets with very narrow size dispersion. In this work, nanocrystals with cubic shapes with 32 nm edges were successfully grown from ultra-dilute NaCl solution (1 µg mL–1) on a millisecond timescale by an ES technique. Dispersed and charged microdroplets were created by ES. In the process, an increase in ion strength and built-in electric field in microdroplets promoted nucleation and growth. Moreover, solvent evaporation increased solute and charge concentration and decreased the size of the microdroplets, which had a further effect on nucleation and growth. The morphologies of crystals were the competitive results of ion strength and evaporation. Fortunately, these physicochemical properties can be controlled facilely by adjusting the ES parameters. This report suggests potential application of ES technology for controllable crystallization of pharmaceuticals, proteins, etc.
Co-reporter:Yu Sun, Long Yuan, Xiaofeng Wu, Yingge Cong, Keke Huang, and Shouhua Feng
Langmuir 2016 Volume 32(Issue 17) pp:4189-4193
Publication Date(Web):April 9, 2016
DOI:10.1021/acs.langmuir.6b00628
We fabricated Ga-GaSb nanohybrids by the droplet epitaxy method and precisely tuned the interaction between the metal and semiconductor parts. Selective absorption enhancement from 1.2 to 1.3 μm was confirmed via ultraviolet–visible–infrared absorption spectra in all of the nanohybrids, which shows size and component dependence. Valence band spectra of the samples indicate that carrier separation occurs at the interface at the Schottky junction and the high density of states near the Fermi level in a semiconductor controls the process of charge transfer. Thus, the enhanced selective absorption in the infrared region will open up a broad prospect for applications in infrared detection and thermophotovoltaic cells.
Co-reporter:Yuan Zhang;Wenchun Feng;Keke Huang;Long Yuan;Yanyan Du;Xiaofeng Wu
European Journal of Inorganic Chemistry 2015 Volume 2015( Issue 4) pp:690-695
Publication Date(Web):
DOI:10.1002/ejic.201402874
Abstract
A series of red-emitting homogeneous Lu3TaO7:Eu3+@Lu3TaO7 (core-shell) nanoparticles have been successfully synthesised for applications in white-light-emitting diodes (WLEDs). The shell-core ratio (SR) was modulated by the amount of core and shell material which gives a depiction of the effect of SR on luminescence intensity. Powder X-ray diffraction data indicate that the core-shell structures of the nanoparticles are homogeneous in the Fmm space group. X-ray photoelectron spectroscopy results provide evidence of the core-shell architecture with obvious decreasing amounts of Eu3+ on the surface with an increase in the thickness of the shell. Transmission electron microscopy results showed that by coating the Lu3TaO7 shell on the surface of the Lu3TaO7:Eu3+ core, the particle size increased corresponding to the addition of shell material. The photoluminescence lifetime decays increased and this gives additional evidence of the core-shell structure. Furthermore, the best emission intensity was obtained with a relative optimum shell-core ratio (1/8), showing an increase of 31.5 % compared with the bare core material.
Co-reporter:Lei Ge, Long Yuan, Keke Huang, Wenchun Feng, Hairui Fang and Shouhua Feng
New Journal of Chemistry 2015 vol. 39(Issue 7) pp:5080-5083
Publication Date(Web):25 Mar 2015
DOI:10.1039/C5NJ00284B
Fluorides and oxide-fluorides play important roles in several technological fields. Herein, we have synthesized the crystals of β-Li3VF6 and Na3VF6 under mild hydrothermal conditions without any hydrofluoric acid. These two compounds were well-crystallized and showed antiferromagnetic interactions with isolated magnetic units.
Co-reporter:Keke Huang, Xuefeng Chu, Long Yuan, Wenchun Feng, Xiaofeng Wu, Xiyang Wang and Shouhua Feng
Chemical Communications 2014 vol. 50(Issue 65) pp:9200-9203
Publication Date(Web):26 Jun 2014
DOI:10.1039/C4CC00023D
A simple treatment of La0.5Sr0.5MnO3 with diluted HNO3 creates more B-sites (rich) on the terminated perovskite surface and improves its catalytic activity toward CO oxidation, and the perovskite catalyst possesses a higher ratio of Mn4+/Mn3+ and thus enhances the O2 adsorption capability, favourable for CO oxidation and catalytic activity.
Co-reporter:Keke Huang, Wenchun Feng, Long Yuan, Jiaxin Zhang, Xuefeng Chu, Changmin Hou, Xiaofeng Wu and Shouhua Feng
CrystEngComm 2014 vol. 16(Issue 42) pp:9842-9846
Publication Date(Web):21 Aug 2014
DOI:10.1039/C4CE01332H
Perovskite oxide (La1−xSrxMnO3) crystal facet control is rarely reported due to difficulties in modulation, even though it is highly important in surface-dependent catalytic and electrochemical applications. In this paper, we present the shape diversity of La1−xSrxMnO3 crystals evolved from a hydrothermal environment when urea is used as an effective facet modulator. By changing the La/Sr ratio from 1 to 3, the structure changes from pseudo-cubic to P21/a monoclinic, induced by the evolution processes of different facets during crystallization. Our proposed hypothesis is that the NH4+ interaction with octahedral MnO6 may be beneficial in enhancing the activity of La1−xSrxMnO3 for applications, and moves toward strategies for the development of highly active perovskite oxides.
Co-reporter:Yan Chen, Mingyu Shang, Xiaofeng Wu and Shouhua Feng
CrystEngComm 2014 vol. 16(Issue 24) pp:5418-5423
Publication Date(Web):13 May 2014
DOI:10.1039/C3CE42394H
A hydrothermal method was developed to prepare blue pigments SrCuSi4O10 and BaCuSi4O10 in high yield and purity without any organic surfactants. The SEM image of SrCuSi4O10 indicates the presence of multi-layered microparticles with good dispersion. Hydrothermally synthetic Chinese blue BaCuSi4O10 forms hierarchically mesoporous microspheres, which are comprised of polydisperse aggregates consisting of sheetlike nanocrystallites. The possible growth mechanism of the hierarchical structures was discussed based on TEM images. The samples show strong near-infrared luminescence (ΦEM = 8.5% for SrCuSi4O10 and ΦEM = 6.9% for BaCuSi4O10), which is available for optical sensors.
Co-reporter:Changmin Hou, Wenchun Feng, Long Yuan, Keke Huang and Shouhua Feng
CrystEngComm 2014 vol. 16(Issue 14) pp:2874-2877
Publication Date(Web):08 Jan 2014
DOI:10.1039/C3CE42554A
By changing the traditional hydrothermal environment, facets of LaFeO3, La0.75Sr0.25MnO3, and LaCrO3 can be tailored from low energy {100} facets to {110}, {111}, and a mixture of them, respectively.
Co-reporter:Yan Chen, Yuan Zhang, Shouhua Feng
Dyes and Pigments 2014 Volume 105() pp:167-173
Publication Date(Web):June 2014
DOI:10.1016/j.dyepig.2014.01.017
•In this work, a green chemistry strategy was developed to synthesize two inorganic pigments: Chinese purple BaCuSi2O6 and dark blue BaCu2Si2O7.•And this soft chemistry method was characterized with good yield and high purity of the products.•Hydrothermal synthetic BaCuSi2O6 exhibits purple instead of the blue of the reported solid state synthetic sample.•Our study shows that hydrothermal synthetic BaCuSi2O6 exhibits interesting broad near-infrared luminesce.•Furthermore, BaCuSi2O6 shows spin gapped antiferromagnetic property and dark blue BaCu2Si2O7 exhibits quasi-one-dimensional antiferromagnetic property.A green chemistry strategy was developed to prepare two barium copper silicate pigments. Chinese purple BaCuSi2O6 and dark blue BaCu2Si2O7 are synthesized through mild hydrothermal treatment in narrow pH range. The compounds are characterized by powder X-ray diffraction techniques, infrared spectroscopy, X-ray photoelectron spectroscopy, energy dispersive spectroscopy, luminance and magnetic measurements. When excited by a visible laser, hydrothermally synthetic BaCuSi2O6 exhibits a broad emission in the near-infrared region with an excited state lifetime 6.4 μs due to the square-planar Cu2+ ions as the chromophores. Magnetic analysis of BaCuSi2O6 indicates the spin gapped antiferromagnetic property due the presence of the Cu–Cu dimers in the structure. BaCu2Si2O7 shows interesting quasi-one-dimensional antiferromagnetic property.
Co-reporter:Jing Yu, Keke Huang, Long Yuan and Shouhua Feng
New Journal of Chemistry 2014 vol. 38(Issue 4) pp:1441-1445
Publication Date(Web):29 Nov 2013
DOI:10.1039/C3NJ01096A
Three families of scheelite CaWO4-based red luminescent phosphors, Ca1−1.5xWO4:xEu3+ (0.02 ≤ x ≤ 0.09), Ca0.925−ySryWO4:0.05Eu3+ (0 ≤ y ≤ 0.9) and Ca0.625Sr0.30W1−zMozO4:0.05Eu3+ (0 ≤ z ≤ 0.7) were hydrothermally prepared and characterized. The substitutions of Sr2+ for Ca2+ and Mo6+ for W6+, which improve local symmetries surrounding Eu3+, assisted the energy transfer from O2− to Eu3+ in the process of optimizing the luminescence properties. The z = 0.2 members of Ca0.625Sr0.30W0.80Mo0.20O4:0.05Eu3+ exhibited excellent bright red luminescence at 616 nm under near-UV excitation, narrowed emission spectra, room temperature luminescence lifetimes of milliseconds and maximum quantum efficiencies of 49%.
Co-reporter:Long Yuan, Keke Huang, Changmin Hou, Wenchun Feng, Shan Wang, Cuiping Zhou and Shouhua Feng
New Journal of Chemistry 2014 vol. 38(Issue 3) pp:1168-1172
Publication Date(Web):27 Nov 2013
DOI:10.1039/C3NJ01046E
A low temperature, one-pot route to iron-doped rare-earth chromite perovskite was proposed. Fe half-doped rare-earth chromites, REFe0.5Cr0.5O3 (RE = La, Tb, Ho, Er, Yb, Lu and Y) were prepared via a mild hydrothermal method and their magnetic properties were studied. All of these materials are well-crystallized and the profile refinement of powder X-ray diffraction (XRD) data showed that each of them adopts an orthorhombic distorted (Pbnm) perovskite structure. The temperature dependence of the magnetization curves indicate an improved order of arrangement of Fe3+ and Cr3+ at the B-site in some samples. Hysteresis measurements of YFe0.5Cr0.5O3 indicate that saturated and remnant magnetization were improved greatly compared to that prepared via the solid state method.
Co-reporter:WenZhe Si;KeKe Huang;XiaoFeng Wu
Science China Chemistry 2014 Volume 57( Issue 6) pp:803-806
Publication Date(Web):2014 June
DOI:10.1007/s11426-014-5099-6
Epitaxial growth of SmFeO3/SrRuO3 was achieved on SrTiO3 substrates by the pulsed laser deposition (PLD) method at 973 K under oxygen partial pressure of 12.5 Pa. No Fe2+ leakage was detected in our SmFeO3 film. The remanent polarization and coercive electric field of the thin film with a higher degree of orientation along (110) were 1.97 μC/cm2 and 0.89×104 V/cm at room temperature, respectively. This film showed enhanced canted antiferromagnetism spin ordering compared with its corresponding powder materials.
Co-reporter:Xuefeng Chu, Keke Huang, Mei Han, and Shouhua Feng
Inorganic Chemistry 2013 Volume 52(Issue 8) pp:4130-4132
Publication Date(Web):March 27, 2013
DOI:10.1021/ic400296b
Perovskite structure La0.7Sr0.3MnO3 magnetic hollow microspheres with complex units were prepared via the hydrothermal route without hard and soft templates. The formation of hollow microspheres follows the self-construction mechanism involving oriented attachment, dissolution, and recrystallization processes. It exhibits a ferromagnetic behavior at room temperature.
Co-reporter:Ziwei Liu, Ge Tian, Shiyao Zhu, Chao He, Huijuan Yue, and Shouhua Feng
ACS Sustainable Chemistry & Engineering 2013 Volume 1(Issue 3) pp:313
Publication Date(Web):January 31, 2013
DOI:10.1021/sc3001146
We report that the reduction of carbon dioxide (CO2) to methane (CH4) under mild hydrothermal conditions is carried out in the presence of iron nanoparticles. In the reaction, the iron nanoparticles not only act as the reducing agent but also catalyze the reduction of CO2.Keywords: CO2; Green chemistry; Hydrothermal; Nanoparticles; Reduce
Co-reporter:Yanyan Du, Yuan Zhang, Keke Huang, Shan Wang, Long Yuan and Shouhua Feng
Dalton Transactions 2013 vol. 42(Issue 22) pp:8041-8048
Publication Date(Web):12 Mar 2013
DOI:10.1039/C3DT50141H
Rare-earth niobate and tantalate materials are of considerable interest for use as phosphors, photocatalysts and ionic conductors. We successfully synthesized Ln3MO7 (Ln = Y, Ce, Er, Ho, Tm, Yb and Lu, M = Ta, Nb) nanophosphors by a hydrothermal method using the water-soluble Lindqvist ion polyoxometalates [HNb6O19]7− and [Ta6O19]8− as Nb and Ta sources. The Pawley refinements of these nanophosphors revealed that the Lu3TaO7 and Lu3NbO7 nanophosphors could be indexed in the cubic system with the space group Fmm, and that Y3TaO7 crystallizes in orthorhombic symmetry with the space group of C2221. These three solid compounds are nanoparticles with average particle sizes of 7.5, 5.9 and 4.0 nm for Lu3TaO7, Lu3NbO7 and Y3TaO7, respectively. The photoluminescence properties of Eu3+ doped Lu3TaO7, Lu3NbO7 and Y3TaO7 were studied, and Eu3+/Sr2+ co-doped Ln3MO7 (M = Ta, Nb) has an enhanced emission intensity compared to that of Ln3MO7:Eu3+ (M = Ta, Nb).
Co-reporter:Shan Wang, Keke Huang, Beining Zheng, Jiaqi Zhang, Shouhua Feng
Materials Letters 2013 Volume 101() pp:86-89
Publication Date(Web):15 June 2013
DOI:10.1016/j.matlet.2013.03.083
•Sr-doped LaCrO3 (La0.9Sr0.1CrO3 and La0.8Sr0.2CrO3) were synthesized as cube-shaped crystalline phases under mild hydrothermal conditions.•KOH and temperature play rather important roles in the formation of products.•The conductivities of samples increase with Sr doping content. The Neel temperatures of LaCrO3, La0.9Sr0.1CrO3 and La0.8Sr0.2CrO3 are 253, 260 and 252 K, respectively.Sr-doped LaCrO3 (La0.9Sr0.1CrO3 and La0.8Sr0.2CrO3) were synthesized as cube-shaped crystalline phases under mild hydrothermal conditions. All the samples can be prepared in a single step by hydrothermal treatment at 260 °C. The crystalline products were characterized by means of powder X-ray diffraction, scanning electron microscope, inductively coupled plasma and EDS. The crystals adopt perovskite-like structure (space group Pnma) and have a narrow particle size distribution in the range of 1–2 μm. The content of the reactant KOH and reaction temperature play important roles in the formation of products. The temperature dependence of electrical conductivities of the samples, measured using a DC four-probe method, shows that the conductivities increase with Sr doping, and the behavior of each sample can be ascribed to the small polaron hopping conduction mechanism. All the compounds show an antiferromagnetic transition and relative lower Néel temperatures.
Co-reporter:JiaQi Zhang;KeKe Huang;WenZhe Si;XiaoFeng Wu;Gang Cheng
Science China Chemistry 2013 Volume 56( Issue 5) pp:583-587
Publication Date(Web):2013 May
DOI:10.1007/s11426-012-4813-5
A novel photovoltaic phenomenon of internal photoemission was found in a low cost manganite La0.62Ca0.29K0.09MnO3 (LCKMO)/zinc oxide (ZnO) heterojunction bilayers grown on ITO substrate by pulsed laser deposition (PLD) at relative low growth temperature. The heterostructure ITO/LCKMO/ZnO/Al exhibits reproducible rectifying characteristics and light current under continuous laser irradiation of λ = 325 nm. We report here the influence of LCKMO/ZnO bilayers’ thickness on the electrical and photoelectric properties of the heterostructure at room temperature. The power conversion efficiency (PCE) is achieved when the LCKMO and ZnO layers are thin enough or the full space charge layer is sufficient. We obtained the maximum value of PCE of 0.0145% when the thicknesses of LCKMO and ZnO layers are 25 and 150 nm, respectively. The open circuit voltage is 0.04 V under this condition due to the internal photoemission.
Co-reporter:Shouhua Feng;Dan Wang
Research on Chemical Intermediates 2011 Volume 37( Issue 2-5) pp:103-106
Publication Date(Web):2011 April
DOI:10.1007/s11164-011-0242-x
Co-reporter:Weiwei Hu ; Yan Chen ; Hongming Yuan ; Guanghua Li ; Yu Qiao ; Yuanyuan Qin
The Journal of Physical Chemistry C 2011 Volume 115(Issue 18) pp:8869-8875
Publication Date(Web):April 19, 2011
DOI:10.1021/jp1103142
Bi1-xGdxFeO3 (x = 0, 0.1, 0.2, 0.3) nanoparticles were synthesized by polyol-mediated method. They show a compositional-driven phase transition from a rhombohedral phase (R3c) for x = 0 to an orthorhombic phase (Pn21a) for x = 0.2 and 0.3, and x = 0.1 is a mixture of both phases. Improved ferroelectric hysteresis loops are observed at room temperature for all samples with moderate polarization values. The substitution of Gd ions for Bi enhances the ferromagnetic properties of this system. A large saturated magnetization of 0.11 μB/f.u. is obtained at 300 K, which is mainly attributed to the antiferromagnetic core and ferromagnetic surface of the nanoparticles, together with the structural distortion. Temperature- and field-dependence of magnetization curves reveal the frustrated magnetic behavior of this system. The variation of magnetic behaviors at different reaction temperatures is also related to the competition between canted antiferromagnetic Fe sublattice and paramagnetic Gd sublattice.
Co-reporter:Chao He, Ge Tian, Ziwei Liu and Shouhua Feng
Organic Letters 2010 Volume 12(Issue 4) pp:649-651
Publication Date(Web):January 27, 2010
DOI:10.1021/ol9025414
The reduction of carbon dioxide (CO2) under mild hydrothermal conditions was carried out in the presence of iron nanoparticles. In this reaction system, the iron nanoparticles not only act as the reducing agent but also catalyze the reduction of CO2 to form formic acid and acetic acid.
Co-reporter:Gull Maheen;Ge Tian;Zhiguang Song;Chao He;Zhan Shi;Ziwei Liu;Hongming Yuan
Journal of Heterocyclic Chemistry 2010 Volume 47( Issue 2) pp:483-485
Publication Date(Web):
DOI:10.1002/jhet.348
Co-reporter:Gull Maheen;Ge Tian;Yingwu Wang;Chao He;Zhan Shi;Hongming Yuan
Heteroatom Chemistry 2010 Volume 21( Issue 3) pp:161-167
Publication Date(Web):
DOI:10.1002/hc.20591
Abstract
Important biological phosphate esters such as sn-glycerol-3-phosphate, glycerol-2-phosphate, and phosphoethanolamine were synthesized under hydrothermal conditions. Phosphorus was incorporated into the biomolecules, leading to the formation of COP type compounds hydrothermally. Only perlite-catalyzed reaction at 180°C could result in the formation of sn-glycerol-3-phosphate, whereas glycerol-2-phosphate could be easily synthesized at 100°C with or without minerals and phosphoethanolamine was obtained within a temperature range of 100 to 120°C. © 2010 Wiley Periodicals, Inc. Heteroatom Chem 21:161–167, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20591
Co-reporter:Ge Tian Dr.;Chao He;Yan Chen Dr.;Hong-Ming Yuan ;Zi-Wei Liu;Zhan Shi ;Shou-Hua Feng
ChemSusChem 2010 Volume 3( Issue 3) pp:323-324
Publication Date(Web):
DOI:10.1002/cssc.200900274
Co-reporter:Lijie He, Hongming Yuan, Keke Huang, Chen Yan, Guanghua Li, Qiaoru He, Yang Yu, Shouhua Feng
Journal of Solid State Chemistry 2009 Volume 182(Issue 8) pp:2208-2212
Publication Date(Web):August 2009
DOI:10.1016/j.jssc.2009.03.024
The single crystals of perovskite fluorides (NH4)2NaVF6 and Na3VF6 were synthesized under mild hydrothermal conditions. The structures of the compounds were determined by means of single-crystal and powder X-ray diffraction analyses, respectively. (NH4)2NaVF6 has a cubic elpasolite-type structure and crystallizes in the space group Fm3¯m with lattice constant a=8.495(0) Å. Rietveld refinement indicates that Na3VF6 has a monoclinic structure and is in space group P21/n. The compounds were characterized by scanning electron microscopy, thermogravimetric and differential thermal analysis, and variable temperature magnetic susceptibility. With the temperature decreasing, the magnetic studies of the compounds showed the magnetic ordering was related to the crystallographic features and isolated magnetic units.The single crystals of perovskite fluorides (NH4)2NaVF6 and Na3VF6 were synthesized under mild hydrothermal conditions. (NH4)2NaVF6 has a cubic elpasolite-type structure and crystallizes in the space group Fm3¯m with lattice constant a=8.495(0) Å. The compound of Na3VF6 has a monoclinic structure and in space group P21/n. The hydrothermal synthesis, structural characterization and magnetic properties of the two compounds were investigated.
Co-reporter:Ling WANG, Xiao-xia ZHANG, Hong-ming YUAN, Yan CHEN, Zhong-ping DONG, Guang-sheng PANG, Shou-hua FENG
Chemical Research in Chinese Universities 2008 Volume 24(Issue 1) pp:1-3
Publication Date(Web):January 2008
DOI:10.1016/S1005-9040(08)60001-X
Co-reporter:Ying Hou;Ming Yang;Guangsheng Pang
Journal of Materials Science 2008 Volume 43( Issue 7) pp:2149-2152
Publication Date(Web):2008 April
DOI:10.1007/s10853-007-1958-2
In this work, ZnO microrods with etched surface are prepared by two-step hydrothermal reaction. ZnO microrods are prepared firstly by decomposing LHS-Zn under hydrothermal conditions. It is found that the (0001)-Zn face of ZnO microrods will dissolve partly due to the existence of LHS-Zn during further hydrothermal treatment, and ZnO microrods with etched surface are obtained. X-ray powder diffraction is used to determine the crystal structure, and scanning electron microscopy is used to observe the morphology of products. The photoluminescence spectra are investigated.
Co-reporter:Shouhua Feng;Hongming Yuan;Zhan Shi;Yan Chen
Journal of Materials Science 2008 Volume 43( Issue 7) pp:2131-2137
Publication Date(Web):2008 April
DOI:10.1007/s10853-007-1988-9
Perovskite oxides have provided magical structural models for superconducting and colossal magnetoresistance, and the search for nano-scale and/or atomic-scale devices with particular property by specific preparations in the same systems has been extensively conducted. We present here the three oxidation states of manganese (Mn3+, Mn4+, Mn5+) in the perovskite oxide, La0.66Ca0.29K0.05MnO3, which most interestingly shows the rectifying effect as atomic-scale p–n junctions (namely FY-Junctions) of single crystals and films. The family of cubic perovskite oxides were synthesised by the so-called hydrothermal disproportionation reaction of MnO2 under the condition of strong alkali media. The new concept of the atomic-scale p–n junctions, based on the ideal rectification characteristic of the p–n junctions in the single crystal, basically originates from the structural linkages of [Mn3+–O–Mn4+–O–Mn5+], where Mn3+\( {\left( {{\text{t}}^{{\text{3}}}_{{{\text{2g}}}} {\text{e}}^{1}_{{\text{g}}} } \right)} \) and Mn5+\( {\left( {{\text{t}}^{{\text{2}}}_{{{\text{2g}}}} {\text{e}}^{{\text{0}}}_{{\text{g}}} } \right)} \) in octahedral symmetry serve as a donor and an acceptor, respectively, corresponding to the localized Mn4+\( {\left( {{\text{t}}^{{\text{3}}}_{{{\text{2g}}}} {\text{e}}^{{\text{0}}}_{{\text{g}}} } \right)} \).
Co-reporter:Huijuan Yue, Dong Zhang, Zhan Shi, Shouhua Feng
Inorganica Chimica Acta 2007 Volume 360(Issue 8) pp:2681-2685
Publication Date(Web):30 May 2007
DOI:10.1016/j.ica.2007.01.004
Two dinuclear oxovanadium(IV) compounds [V(O)(NMet)(μ-OMe)]2 · MeOH (1) and [V(O)(NThr)(μ-OMe)]2 · MeOH (2) were prepared by the reaction of VOSO4 and ONN donor ligands, HNMet and HNThr (HNMet =N-(2-pyridylmethyl)-dl-methionine, HNThr = N-(2-pyridylmethyl)-dl-threonine) derived from 2-pyridinecarbaldehyde and dl-methionine/dl-threonine. Both of these compounds are characterized by single crystal X-ray diffraction. X-ray crystallography revealed that the two vanadium(IV) compounds are both dinuclear structures bridged by methanol groups. Each vanadium atom is six coordinated in a distorted octahedral environment. IR spectroscopy and EPR spectra for these two compounds are also given.Two dinuclear oxovanadium(IV) compounds [V(O)(NMet)(μ-OMe)]2 · MeOH (1) and [V(O)(NThr)(μ-OMe)]2 · MeOH (2) were prepared by the reaction of VOSO4 and designed amino acid derivatives ligands. The dimers were found to contain a planar [(OV)2O2] core consisting of methoxy-bridged trans-oxovanadium(IV) moieties. The ligands complete the distorted octahedral sphere of each oxovanadium(IV) moiety.
Co-reporter:Yan Chen, Hongming Yuan, Ge Tian, Ganghua Zhang, Shouhua Feng
Journal of Solid State Chemistry 2007 Volume 180(Issue 1) pp:167-172
Publication Date(Web):January 2007
DOI:10.1016/j.jssc.2006.09.029
The calcium-doped manganates, Pr1−xCaxMnO3 (x=0.39, 0.46, 0.70, 0.76), were synthesized as cube-shaped crystalline phases under mild hydrothermal conditions for the first time. The crystals could be grown in one step from solutions of metal salts and potassium hydroxide at temperatures ∼240 °C, and found to adopt perovskite-like structure (space group Pbnm). Samples were characterized by powder X-ray diffraction, scanning electron microscopy, inductively coupled plasma analysis and variable temperature dc/ac magnetic susceptibility. The studies indicate that formation of the materials is dependent on the alkalinity and composition of the initial reaction mixtures. The magnetic properties show spin-glass-like behavior due to competing ferromagnetic (FM) and antiferromagnetic (AFM) exchange interactions in Pr1−xCaxMnO3 with x=0.39x=0.39, 0.46.The calcium-doped manganates, Pr1−xCaxMnO3 (x=0.39x=0.39, 0.46, 0.70, 0.76), were synthesized as cube-shaped crystalline phases under mild hydrothermal conditions for the first time. The crystals could be grown in one step from solutions of metal salts and potassium hydroxide solution at temperatures ∼240 °C. The studies indicate that formation of the materials is dependent on the alkalinity and composition of the initial reaction mixtures. The magnetic properties show spin-glass-like behavior due to competing ferromagnetic and antiferromagnetic exchange interactions in Pr1−xCaxMnO3 with x=0.39x=0.39, 0.46.
Co-reporter:Yan Chen, Hongming Yuan, Ge Tian, Ganghua Zhang, Shouhua Feng
Journal of Solid State Chemistry 2007 Volume 180(Issue 4) pp:1340-1346
Publication Date(Web):April 2007
DOI:10.1016/j.jssc.2007.02.005
RMn2O5 (R=La, Pr, Nd, Tb, Bi) crystallites were prepared by a mild hydrothermal method and characterized by powder X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy (XPS) and magnetic measurement. The formation of manganates was sensitive to the alkalinities and Mn-containing precursors of the reaction mixtures. This family of manganates is isostructural and has a space group of Pbam. The magnetic measurements for RMn2O5 showed an antiferromagnetic transition. The strong irreversibility between the ZFC and FC curves indicated a helicoidally magnetic structure below 40 K. The max d.c. susceptibilities of LaMn2O5+δ (δ=0.01, 0.06, 0.08, 0.16, 0.17) were found to be variable and the excess oxygen (δ) in the compounds was influenced by the alkalinity used in the hydrothermal synthesis.Several RMn2O5 (R=La, Pr, Nd, Tb, Bi) and LaMn2O5+δ crystallites were prepared by the mild hydrothermal treatment of mixtures of rare-earth oxides, K-birnessite gel and KOH. The magnetic susceptibility measurements show an antiferromagnetic transition in RMn2O5 (R=Pr, Nd, Bi). Magnetic susceptibility of the LaMn2O5+δ was variable at low temperature due to the different oxygen excess in the compound, which is dominated by the different KOH concentration used in the hydrothermal synthesis.
Co-reporter:Ying Hou;Ming Yang;Guangsheng Pang
Crystal Research and Technology 2007 Volume 42(Issue 11) pp:1068-1072
Publication Date(Web):20 JUN 2007
DOI:10.1002/crat.200710947
The influence of annealing atmosphere on the optical properties of flower-like ZnO is investigated. The flower-like ZnO is composed of nanosheets. Annealing at 500°C results in the increase of the thickness of nanosheets and the enhancement of UV emission. PL spectra results show that the annealing atmosphere affects the visible emission band, which is sensitive to intrinsic and surface defects in the flower-like ZnO. The vibrational properties of the flower-like ZnO annealing in different atmospheres are characterized by Raman spectra. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Co-reporter:Ming Yang;Guangsheng Pang;Jixue Li;Linfeng Jiang
European Journal of Inorganic Chemistry 2006 Volume 2006(Issue 19) pp:
Publication Date(Web):28 AUG 2006
DOI:10.1002/ejic.200600369
ZnO nanowires with diameters in the range of 10 to 30 nm and lengths of ca. several micrometers are prepared with the use of ZnO nanoparticles as building blocks. The length and diameter of the ZnO nanowires can be controlled by the variation of the concentration of the nanoparticles in the orientation attachment process. A plausible mechanism for the concentration-controlled orientation attachment process is suggested. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Co-reporter:Lei Wang, Hong Ding, Ying Hou, Linlin Zhu, Zhan Shi, Shouhua Feng
Journal of Solid State Chemistry 2006 Volume 179(Issue 8) pp:2584-2588
Publication Date(Web):August 2006
DOI:10.1016/j.jssc.2006.04.008
Employing 3-dimethylamino-1-propylamine as a template, a new three-dimensional (3-D) zincophosphite (C5H16N2)·[Zn3(HPO3)4]·H2O has been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction (XRD), FTIR, elemental analysis, powder XRD, and thermogravimetric analysis (TGA). The compound crystallizes in the triclinic space group P1¯, with cell parameters, a=8.9884(2) Å, b=10.326(2) Å, c=11.917(2) Å, α=66.98(3)°, β=89.01(3)°, and γ=78.98(3)°, V=997.2(3) Å3 and Z=2. The connectivity of the ZnO4 tetrahedra and HPO3 pseudo pyramids results in inifinite edge-sharing, ladderlike chains of 4-membered rings, which are further linked by Zn–O–P bonds to form a 3-D structure that with interesting 12-membered ring channels along the [100] and [001] directions. The diprotonated amine molecules sit in the middle of the channels along the [100] direction and interact with the framework via hydrogen bonds. There also exist channels with 8-membered ring window along the [100] and [010] directions.View of the 3-D structure along the a-axis.
Co-reporter:Lei Wang, Ming Yang, Guanghua Li, Zhan Shi, Shouhua Feng
Journal of Solid State Chemistry 2006 Volume 179(Issue 1) pp:156-160
Publication Date(Web):January 2006
DOI:10.1016/j.jssc.2005.10.010
Employing 4,4′-bipyridine as a bridged ligand, a new three-dimensional (3-D) hybrid zinc phosphate [Zn2(HPO4)2(4,4′-bipy)]·3H2O has been prepared under hydrothermal conditions and characterized by single crystal X-ray diffraction. This compound crystallizes in the monoclinic space group C2/c , with cell parameters, a=21.188(4)Å, b=10.229(2)Å, c=9.0656(18)Å, β=90.21(3)°β=90.21(3)°, V=1964.8(7)Å3 and Z=4Z=4. The connectivity of the ZnO3N and HPO4 tetrahedra results in a 2-D neutral layer that with interesting 4,82 net along the bc plane. Furthermore, the 4,4′-bipyridine molecule links the 4,82 net into a 3-D structure. The water molecules sit in the middle of the channels and interact with the framework via hydrogen bonds. The compound exhibits intense photoluminescence at room temperature.View of the two-dimensional neutral zinc phosphate layer along the bc plane.
Co-reporter:Yao-hua XU, Yong-hau LI, Shou-hua FENG, Xiao-feng CHEN, Hai-ying JIN, Wen-qin PANG, Chun-ying DUAN, Xiao-zeng YOU
Chemical Research in Chinese Universities 2006 Volume 22(Issue 1) pp:1-5
Publication Date(Web):January 2006
DOI:10.1016/S1005-9040(06)60032-9
Co-reporter:Chang-min HOU, Ke-ke HUANG, Zhong-min GAO, Xiang-shan LI, Shou-hua FENG, Yuan-tao ZHANG, Guo-tong DU
Chemical Research in Chinese Universities 2006 Volume 22(Issue 5) pp:552-555
Publication Date(Web):September 2006
DOI:10.1016/S1005-9040(06)60160-8
ZnO (002) films with different thicknesses, grown on Al2O3 (006) substrates by metal-organic chemical vapor deposition (MOCVD), were etched by Ar ion beams. The samples were examined by D8 X-ray diffraction, scanning electron microscopy (SEM), and photoluminescence (PL) spectrometry. The structural properties vary with the increasing thickness of the films. When the film thickness is thin, the phi (Φ) scanning curves for ZnO(103) and sapphire(116) substrate show the existence of two kinds of orientation relationships between ZnO films and sapphire, which are ZnO (002) // Al2O3 (006), ZnO (100) // Al2O3 (110) and ZnO (002)// Al2O3 (006), ZnO (110)//Al2O3 (110). When the thickness increases to 500 nm there is only one orientation relationship, which is ZnO (002)// Al2O3 (006), ZnO [100]// Al2O3 [110]. Their photoluminescence (PL) spectra at room temperature show that the optical properties of ZnO films have been greatly improved when increasing the thickness of films is increased.
Co-reporter:Yong Fan;Guang Hua Li;Lei Yang;Zhi Ming Zhang;Yan Chen;Tian You Song;Shou Hua Feng
European Journal of Inorganic Chemistry 2005 Volume 2005(Issue 16) pp:
Publication Date(Web):7 JUL 2005
DOI:10.1002/ejic.200500112
A 3D hydroxysulfate, Mn5(OH)8SO4, formed from a mild hydrothermal reaction has been reported. The compound crystallizes in the triclinic system P with cell parameters a = 7.5501(5) Å, b = 8.5558(6) Å, c = 8.6059(5) Å, α = 98.122(4)°, β = 102.370(4)°, γ = 99.646(4)°, V = 526.19(6) Å3 and Z = 2. The crystal structure consists of a 3D framework with channels along the c-axis. In this structure, the manganese atoms in the distorted pentahedra and octahedra are interconnected by OH groups to form layers along the bc plane. These layers are further connected with MnO5 distorted pentahedra, MnO6 octahedra and [SO4]2– tetrahedra, resulting in a complicated network. The temperature dependence of the magnetic susceptibility shows a weak antiferromagnetic interaction in the compound. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Co-reporter:Dong Zhang, Huijuan Yue, Zhan Shi, Min Guo, Shouhua Feng
Microporous and Mesoporous Materials 2005 Volume 82(1–2) pp:209-213
Publication Date(Web):5 July 2005
DOI:10.1016/j.micromeso.2005.04.001
A organically templated vanadium(IV) phosphite, [C2N2H10] · [(VO)3(H2O)(HPO3)4] · H2O, was hydrothermally synthesized and characterized by single-crystal X-ray diffraction. This compound crystallizes in the monoclinic system with the space group P21/c and cell parameters a = 12.3052(7) Å, b = 11.8124(7) Å, c = 12.687(8) Å, β = 98.840(5)°, V = 1822.30(19) Å3 and Z = 4. The three-dimensional network is built up from the corner linkage of new pentameric secondary building units based on two HPO3 pseudo pyramids and three VO6 octahedra sharing vertices. The framework delimits large 10-membered zigzag tunnels along [1 0 0] and smaller eight-membered ones along [0 0 1]. The water molecules and the diprotonated amines are inserted in the channels. IR spectroscopy, ESR spectra and magnetic susceptibility data for this compound are given.
Co-reporter:Dong Zhang, Huijuan Yue, Zhan Shi, Shouhua Feng
Solid State Sciences 2005 Volume 7(Issue 10) pp:1256-1260
Publication Date(Web):October 2005
DOI:10.1016/j.solidstatesciences.2005.06.004
Two novel organically templated zincophosphites, [C6H22N4]0.5⋅[Zn2(HPO3)3] and [C3N2H5]⋅[Zn1.5(HPO3)2] were synthesized using triethylenetetramine and imidazole as templates and characterized by single-crystal X-ray diffraction. [C6H22N4]0.5⋅[Zn2(HPO3)3] crystallizes in monoclinic P-1P-1 with cell parameters a=7.6468(6) Åa=7.6468(6) Å, b=8.4084(6) Åb=8.4084(6) Å, c=12.3097(6) Åc=12.3097(6) Å, and α=70.488(4)°α=70.488(4)°, β=73.687(4)°β=73.687(4)°, γ=64.772(4)°γ=64.772(4)°. [C3N2H5]⋅[Zn1.5(HPO3)2] crystallizes in monoclinic C2/cC2/c with cell parameters a=10.3397(6) Åa=10.3397(6) Å, b=14.7632(6) Åb=14.7632(6) Å, c=13.7726(7) Åc=13.7726(7) Å, and β=100.734(5)°β=100.734(5)°. Two zincophosphites consist of alternatively linked ZnO4 tetrahedra and [HPO32−] pseudo pyramidal units. [C6H22N4]0.5⋅[Zn2(HPO3)3] has two-dimensional structure and possesses a triple unit of 4-membered ring building-unit. [C3N2H5]⋅[Zn1.5(HPO3)2] has three-dimensional structure and imidazole cations are located in the 12-membered ring channel systems. Both of the compounds were also characterized by IR spectroscopy, thermogravimetric and differential thermal analyses.
Co-reporter:Lei Yang, Minghui Bi, Yong Fan, Dong Zhang, Youqing Dong, Shouhua Feng
Inorganica Chimica Acta 2005 Volume 358(Issue 15) pp:4505-4510
Publication Date(Web):1 December 2005
DOI:10.1016/j.ica.2005.08.031
An organically templated zinc-substituted gallium phosphite, [H3N(CH2)2NH3]1/2 · [GaZn(HPO3)3(H2O)2] was synthesized under mild hydrothermal conditions in the presence of ethylenediamine (en) as structure-directing agent and characterized by single-crystal X-ray diffraction analysis. It crystallizes in the orthorhombic space group Pbcn with unit cell parameters: a = 18.6146(10) Å, b = 11.0454(6) Å, c = 10.9074(4) Å, V = 2242.62(19) Å3 and Z = 8. This compound has a three-dimensional framework built up from secondary building units (SBU) of Ga(III) (or Zn(II)) and HPO3 pseudopyramid by sharing vertices. The structure displays a two-dimensional channel system running along the [0 0 1] and [0 1 0] direction with 5-, 8- and 10-membered rings. The diprotonated ethylenediamine template molecules are located in the channels. In this structure, some of the Ga(III) sites are occupied by Zn(II) atoms. The compound was also characterized by IR spectroscopy, inductively coupled plasma (ICP), X-ray photoelectron spectra (XPS), differential thermal and thermogravimetric analyses.View of the structure of title compound along [0 0 1] direction
Co-reporter:Dong Zhang, Zhan Shi, Huijuan Yue, Guanghua Li, Shouhua Feng
Inorganica Chimica Acta 2005 Volume 358(Issue 2) pp:265-270
Publication Date(Web):25 January 2005
DOI:10.1016/j.ica.2004.07.035
Two novel organically templated zincophosphites, [H2mpipe] · [Zn3(HPO3)4] and [H2en]1.5 · [Zn4.5(HPO3)6] were synthesized using 1-methylpiperazine and ethylenediamine as templates and characterized by single-crystal X-ray diffraction. [H2mpipe] · [Zn3(HPO3)4] possesses novel double 4-membered ring chains and [H2en]1.5 · [Zn4.5(HPO3)6] contains simple 4-membered ring chains which are linked in an ABA–ABA sequence. Two zincophosphites, having three-dimensional structures with 8-membered ring channels, were also characterized by IR spectroscopy, thermogravimetric and differential thermal analyses, and 31P MAS NMR spectroscopy.Two novel zincophosphites, [H2mpipe] · [Zn3(HPO3)4] and [H2en]1.5 · [Zn4.5(HPO3)6], were synthesized and characterized by single-crystal X-ray diffraction. [H2mpipe] · [Zn3(HPO3)4] possesses novel double 4-membered ring chains and [H2en]1.5 · [Zn4.5(HPO3)6] contains simple 4-membered ring chains, which are linked in an ABA–ABA sequence. Two zincophosphites, having three-dimensional structures with 8-membered ring channels, were also characterized by IR spectroscopy, thermogravimetric and differential thermal analyses, and 31P MAS NMR spectroscopy.
Co-reporter:Yongwei Wang, Xiaoying Lu, Yan Chen, Fangli Chi, Shouhua Feng, Xiaoyang Liu
Journal of Solid State Chemistry 2005 Volume 178(Issue 4) pp:1317-1320
Publication Date(Web):April 2005
DOI:10.1016/j.jssc.2004.12.039
Two perovskite rare-earth manganites RMnO3 (R=Ho, Dy) were synthesized from the hydrothermal redox reactions of KMnO4 and MnCl2 at 250 °C and characterized by means of X-ray diffraction, scanning electron microscopy and SQUID. They are orthorhombic, whereas the hexagonal phases, which were competitive strongly with the orthorhombic phases in solid-state reactions, are avoided in the hydrothermal systems. The pure metastable manganites may serve as a model for understanding the magnetisms of Jahn–Teller distortion and charge ordering. This new synthetic approach leaves many rooms for new doped or undoped RMnO3 compounds.Two perovskite rare-earth manganites RMnO3 (R=Ho, Dy) were synthesized from the hydrothermal redox reactions. They are orthorhombic, whereas the hexagonal phases, which were competitive strongly with the orthorhombic phases in solid-state reactions, are avoided in the hydrothermal systems.
Co-reporter:Lei Wang, Ming Yang, Zhan Shi, Yan Chen, Shouhua Feng
Journal of Solid State Chemistry 2005 Volume 178(Issue 11) pp:3359-3365
Publication Date(Web):November 2005
DOI:10.1016/j.jssc.2005.08.014
Two new copper coordination polymers generated from mixed organic ligands 4,4′-bipydine and 1,2,4-benzenetricarboxylate [Cu3(1,2,4-BTC)2(4,4′-bipy)(H2O)4] 1 and [Cu(1,2,4-HBTC)(4,4′-bipy)] 2 (1,2,4-BTC=1,2,4-benzenetricarboxylate) have been prepared hydrothermally and characterized by single crystal X-ray diffraction. Compound 1 crystallizes in the noncentrosymmetric space group Fdd2Fdd2, with a=19.004(3)Å, b=26.711(4)Å, c=11.0770(15)Å, V=5622.8(14)Å3, and Z=8Z=8. Its structure contains two different one-dimensional (1-D) chains for the Cu ions, namely [Cu2(1,2,4-BTC)2]n2n- and [Cu(4,4′-bipy)]n2n+; the carboxylate of 1,2,4-BTC ligands links the two different 1-D chains into an interesting steplike neutral framework. Compound 2 crystallizes in the monoclinic space group P21/nP21/n, with a=9.9806(8)a=9.9806(8), b=16.5512(16)b=16.5512(16), c=11.3109(7)Å, β=99.375(5)°β=99.375(5)°, V=1843.5(3)Å3, Z=4Z=4. Its structure contains novel paddle-wheel clusters Cu2(CO2)4(4,4′-bipy)2 as SBUs which are further linked by monoprotonated 1,2,4-BTC ligands into a 2-D neutral framework. The magnetic behaviors of both compounds have been studied.View of the structure of 2 along the c-axis.
Co-reporter:Yong Fan, Guanghua Li, Wenping Jian, Miao Yu, Li Wang, Zhenfen Tian, Tianyou Song, Shouhua Feng
Journal of Solid State Chemistry 2005 Volume 178(Issue 7) pp:2267-2273
Publication Date(Web):July 2005
DOI:10.1016/j.jssc.2005.04.024
A cobalt phosphonate (H3O)6·[Co4(H2O)4(HPMIDA)2(PMIDA)2)]·2H2O, 1, has been synthesized from a mild solvothermal reaction of Co(II) ion with N-(phosphonomethyl)iminodiacetic acid (H4PMIDA). Compound 1 crystallizes in the triclinic space group P1¯ with cell parameters of a=9.0682(18)Å, b=10.744(2)Å, c=12.731(3)Å, α=93.06(3)°α=93.06(3)°, β=99.66(3)°β=99.66(3)°, γ=90.34(3)°γ=90.34(3)°V=1221.0(4)Å3 and Z=1Z=1. Compound 1 shows a novel tetra-nuclear molecular structure. In the crystal lattice, molecules of 1 hydrogen bond to each other to form two-dimensional (2D) layers, which are further linked together by the co-crystallized H2O molecules and H3O+ counter ions through hydrogen bonding to form the 3D supramolecular network. Thermogravimetric analysis, IR spectrum, magnetic susceptibility and luminescent spectra are given.
Co-reporter:Wenjun Dong, Guangsheng Pang, Zhan Shi, Yaohua Xu, Haiying Jin, Rui Shi, Jingjing Ma, Shouhua Feng
Materials Research Bulletin 2004 Volume 39(Issue 3) pp:433-438
Publication Date(Web):1 March 2004
DOI:10.1016/j.materresbull.2003.10.012
The self-assemble propensity of the controlled shape and size distribution titania nanoparticles makes the particles oriented organization to ordered structures without substrate by a hydrolysis-hydrothermal route. The procedure offers the possibility of a generalized approach to the production of patterned organization of single and complex oxide nanoparticles with size and morphology tunable.
Co-reporter:Zhimin Dai, Guanghua Li, Zhan Shi, Wensheng Fu, Wenjun Dong, Jing Xu, Shouhua Feng
Solid State Sciences 2004 Volume 6(Issue 1) pp:91-96
Publication Date(Web):January 2004
DOI:10.1016/j.solidstatesciences.2003.10.011
A layered vanadium selenite with the composition of β-(H3NCH2CH2NH3)[(VO)(SeO3)2], has been prepared by the reaction of V2O5, VOSO4, with SeO2 under hydrothermal condition in the presence of ethylenediamine. It is characterized by single-crystal X-ray diffraction, inductively coupled plasma, differential thermal–thermogravimetric analysis and magnetic susceptibilities. β-(H3NCH2CH2NH3)[(VO)(SeO3)2] crystallizes in the monoclinic space group P21/c with crystal data: a=9.2476(4) Å, b=10.3475(4) Å, c=9.5088(6) Å, β=96.484(10)°, V=904.07(8) Å3, Z=4, , . The structure of the layered compound, β-(H3NCH2CH2NH3)[(VO)(SeO3)2], can be described as an inorganic net of isolated VO6 octahedral, each sharing four corners with four adjacent SeO3 trigonal pyramids. The connectivity between the VO6 octahedra and the SeO3 pyramids creates V4Se4O1012− ladder which are intercrossed through VO6 octahedra to form the anionic layers of the stoichiometry, [VSe2O7]2−.Graphic
Co-reporter:Lei Wang, Zhan Shi, Guanghua Li, Yong Fan, Wensheng Fu, Shouhua Feng
Solid State Sciences 2004 Volume 6(Issue 1) pp:85-90
Publication Date(Web):January 2004
DOI:10.1016/j.solidstatesciences.2003.11.002
A new three-dimensional metal–organic polymer, [NaZn(1,2,4-BTC)] (where 1,2,4-BTC=1,2,4-benzenetricarboxylate), has been prepared under solvothermal conditions and characterized by single crystal X-ray diffraction. The compound crystallizes in the monoclinic space group P21/c, with cell parameters: a=9.7706(4) Å, b=12.3549(5) Å, c=6.8897(3) Å, β=91.640(2)°, V=831.35(6) Å3 and Z=4. In the three-dimensional structure of the compound, each Zn atom is five-coordinated in distorted trigonal bipyramidal geometry, while the sixfold coordination of Na corresponds to a slightly distorted triangular prism. The organic ligand, 1,2,4-BTC, shows a novel and unprecedented coordination mode: 11 bonds to 10 metals with each carboxylate function exhibiting different linkages. It remains stable when desolvated and when heated up to 410 °C.Graphic
Co-reporter:Lei Wang, Zhan Shi, Wensheng Fu, Guanghua Li, Dong Zhang, Wenjun Dong, Zhimin Dai, Xiaobo Chen, Shouhua Feng
Journal of Solid State Chemistry 2004 Volume 177(Issue 1) pp:80-88
Publication Date(Web):January 2004
DOI:10.1016/S0022-4596(03)00313-X
Two organically templated zincophosphites, (C6H14N2)·[Zn3(HPO3)4] and (C4H14N2)·[Zn3(HPO3)4] have been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction. (C6H14N2)·[Zn3(HPO3)4] crystallizes in the triclinic space group , with cell parameters, a=9.363(4) Å, b=10.051(4) Å, c=10.051(4) Å, α=85.777(13)°, β=82.091(9)°, and γ=79.783(9)°. (C4H14N2)·[Zn3(HPO3)4] crystallizes in the monoclinic space group P21/c, with cell parameters, a=9.9512(3) Å, b=10.1508(3) Å, c=17.8105(5) Å, and β=95.6510(10)°. Although the two structures are different, they have the same anionic framework compositions of [Zn3(HPO3)4]2−. Their frameworks are built up from strictly alternating ZnO4 tetrahedra and HPO3 pseudo pyramids by sharing vertexes. There exist channels with an eight-membered ring window along the a- and c-axis. Powder X-ray diffraction, IR spectroscopy, 31P MAS solid-state NMR, thermogravimetric and differential thermal analyses were also carried out.
Co-reporter:Dong Zhang, Zhan Shi, Wenjun Dong, Wensheng Fu, Lei Wang, Guanghua Li, Shouhua Feng
Journal of Solid State Chemistry 2004 Volume 177(Issue 1) pp:343-349
Publication Date(Web):January 2004
DOI:10.1016/j.jssc.2003.08.028
Two novel organically templated zincophosphites, [C6H4(CH2NH3)2]·[Zn3(HPO3)4] and [CH3CH2CH2NH3]2·[Zn3(HPO3)4] have been synthesized under hydrothermal conditions with different template 1,3-Bis(aminomethyl)benzene and propylamine, and characterized by single-crystal X-ray diffraction. [C6H4(CH2NH3)2]·[Zn3(HPO3)4] crystallizes in the monoclinic space group P21/c, with cell parameters, a=9.5467(10) Å, b=26.405(2) Å, c=7.9946(8) Å, and β=99.472(2)°. [CH3CH2CH2NH3]2·[Zn3(HPO3)4] crystallizes in the orthorhombic space group Pccn, with cell parameters, a=9.8162(15) Å, b=23.284(4) Å, and c=8.9306(12) Å. Two compounds consist of vertex linking of ZnO4 tetrahedral and [HPO32−] pseudopyramidal units. They have similar inorganic frameworks with the same compositions. They are both built up from two-dimensional layers with four- and eight-membered rings and one-dimensional chains composed of four-memberd rings, but their layered structures are different due to the influence of corresponding organic template. To our knowledge, [C6H4(CH2NH3)2]·[Zn3(HPO3)4] is the first mention of a zinc phosphite material with an aromatic template. Two compounds were also characterized by IR spectroscopy, thermogravimetric and differential thermal analyses, and proton-decoupled 31P MAS solid-state NMR spectroscopy.
Co-reporter:Haiying Jin, Yaohua Xu, Guangsheng Pang, Wenjun Dong, Qiang Wan, Yan Sun, Shouhua Feng
Materials Chemistry and Physics 2004 Volume 85(Issue 1) pp:58-62
Publication Date(Web):15 May 2004
DOI:10.1016/j.matchemphys.2003.12.006
Nanoparticles of Al-doped SnO2 have been hydrothermally synthesized. The influences of the hydrothermal reaction time, the molar ratio of Sn/Al as well as the pH value of the solution have been studied. During the hydrothermal synthesis, the particle’s core is rich in Sn and the surface is rich in Al. The Al-rich surface prevents the particles from further growing up either in the hydrothermal condition or during the calcination at 600 °C for a short period of time. The optimal hydrothermal synthesis condition of the nanoparticles is pH 5, Sn/Al=4:1 and 12 h at 160 °C. The products have been studied by XRD, TEM and solid-state NMR.
Co-reporter:Wensheng Fu, Zhan Shi, Guagnhua Li, Dong Zhang, Wenjun Dong, Xiaobo Chen, Shouhua Feng
Solid State Sciences 2004 Volume 6(Issue 2) pp:225-228
Publication Date(Web):February 2004
DOI:10.1016/j.solidstatesciences.2003.12.009
A novel three-dimensional zincophosphite templated by N,N′-dimethylpiperazine, [C6H16N2]·Zn3(HPO3)4, has been synthesized under mild mixed solvothermal conditions and characterized by X-ray crystallography, differential thermal–thermogravimetric analysis (TG-DTA), 31P MAS NMR spectrum and IR spectroscopy. The compound crystallizes in the orthorhombic system, space group Pbcn, a=12.7975(3) Å, b=10.2182(3) Å, c=14.8305(5) Å, V=1939.35(10) Å3, Z=4, Dc=2.165 g cm−3, μ=4.070 mm−1. The structure consists of a network of strictly alternating ZnO4 tetrahedra and [HPO32−] pseudo-pyramid forming tripled 4-membered ring chains. This compound exhibits a three-dimensional structure with 8-membered ring channels where the completely protonated N,N′-dimethylpiperazine cations are located.Graphic
Co-reporter:Lei Wang;Guanghua Li;Jingjing Ma
Applied Organometallic Chemistry 2004 Volume 18(Issue 8) pp:
Publication Date(Web):10 AUG 2004
DOI:10.1002/aoc.674
The two-dimensional zinc phosphate [H3N(CH2)3NH3]0.5[Zn2(PO4)(HPO4)], has been synthesized hydrothermally using 1,3-diaminopropane as the template. Its structure contains an inorganic framework with three-, four-, or six-membered rings, built from PO4, PO3(OH) and ZnO4 tetrahedral moieties sharing vertexes. The protonated 1,3-diaminopropane molecules interact with the framework through hydrogen bonds. Copyright © 2004 John Wiley & Sons, Ltd.
Co-reporter:Wenjun Dong, Wenjiang Li, Kaifeng Yu, K. Krishna, Lizhu Song, Xiaofeng Wang, Zichen Wang, Marc-Olivier Coppens and Shouhua Feng
Chemical Communications 2003 (Issue 11) pp:1302-1303
Publication Date(Web):06 May 2003
DOI:10.1039/B300335C
Silica nanotubes were synthesized from kaolin clay using surfactant intercalation, sulfuric acid and hydrothermal treatments.
Co-reporter:Zhan Shi, Dong Zhang, Guanghua Li, Lei Wang, Xiaoying Lu, Jia Hua, Shouhua Feng
Journal of Solid State Chemistry 2003 Volume 172(Issue 2) pp:464-470
Publication Date(Web):May 2003
DOI:10.1016/S0022-4596(03)00037-9
A novel compound, [HN(C2H4)3N][(VO)2(HPO3)2(OH)(H2O)]·H2O, was hydrothermally synthesized and characterized by single crystal X-ray diffraction. This compound crystallizes in the monoclinic system with the space group C2/c and cell parameters a=11.0753(3) Å, b=17.8265(6) Å, c=16.5229(5) Å, and β=92.362(2)°. The structure of the compound consists of vanadium phosphite layers which are built up from the infinite one-dimensional chains of [(VO)(H2O)(HPO3)2]2− of octahedral VO5(H2O) and pseudo pyramidal [HPO3], and bridging binuclear fragments of [VO(OH)]2. Thermogravimetric analysis and magnetic susceptibility data for this compound are given.
Co-reporter:Zhan Shi, Dong Zhang, Shouhua Feng, Guanghua Li, Zhimin Dai, Wensheng Fu, Xiaobo Chen and Jia Hua
Dalton Transactions 2002 (Issue 9) pp:1873-1874
Publication Date(Web):28 Mar 2002
DOI:10.1039/B201955H
A novel bimetallic selenite, [Cu(phen)]2V2Se2O11, which is the first example of a coordination complex-linked vanadium selenite, has been hydrothermally prepared and characterized by X-ray crystallography.
Co-reporter:Yachun Mao, Guangshe Li, Wei Xu and Shouhua Feng
Journal of Materials Chemistry A 2000 vol. 10(Issue 2) pp:479-482
Publication Date(Web):19 Jan 2000
DOI:10.1039/A906979H
A family of pyrochlore stannates, M2Sn2O7 (M = La, Bi, Gd or Y) has been prepared from hydrothermal systems at 240°C and structurally characterized by powder X-ray diffraction, transmission electron microscopy and differential thermal analysis. The La and Bi stannates showed nanocrystalline characteristics with average particle sizes of ca. 20 nm. Hydrothermally synthesized pyrochlore stannates were thermally stable and showed ionically conducting properties at high temperatures.
Co-reporter:Yanhui Shi, Changsheng Cao, Shouhua Feng
Materials Letters 2000 Volume 46(Issue 5) pp:270-273
Publication Date(Web):December 2000
DOI:10.1016/S0167-577X(00)00184-1
A pure phase bismuth titanate, Bi4Ti3O12, has been prepared by hydrothermal synthesis. This powder product shows yellowish gray color and plant form shape. Factors that influence the formation of Bi4Ti3O12 include the content of mineralizer KOH, the molar ratio of Bi/Ti, reaction time and temperature. Compared to the solid state reaction for Bi4Ti3O12, current hydrothermal synthesis is preferable in terms of low reaction temperature, homogenous particle distribution and short reaction time.
Co-reporter:Yanhui Shi, Shouhua Feng, Changsheng Cao
Materials Letters 2000 Volume 44(3–4) pp:215-218
Publication Date(Web):June 2000
DOI:10.1016/S0167-577X(00)00030-6
The complex oxides, Bi2MoO6 and Bi2WO6, were hydrothermally prepared at 120–180°C for 2–4 days and characterized by powder X-ray diffraction (XRD), thermogravimetric analysis (TGA), IR spectroscopy, transition electron microscopy (TEM), EDAX analysis and electric conductivity measurements.
Co-reporter:Zhan Shi Dr. ;Shan Gao Dr.;Lirong Zhang Dr.;Guoyu Yang Dr.;Jia Hua Dr.
Angewandte Chemie 2000 Volume 112(Issue 13) pp:
Publication Date(Web):4 JUL 2000
DOI:10.1002/1521-3757(20000703)112:13<2415::AID-ANGE2415>3.0.CO;2-H
Co-reporter:Jinghai Liu; Wanfei Li; Limei Duan; Xin Li; Lei Ji; Zhibin Geng; Keke Huang; Luhua Lu; Lisha Zhou; Zongrui Liu; Wei Chen; Liwei Liu; Shouhua Feng;Yuegang Zhang
Nano Letter () pp:
Publication Date(Web):July 6, 2015
DOI:10.1021/acs.nanolett.5b01919
Novel sulfur (S) anchoring materials and the corresponding mechanisms for suppressing capacity fading are urgently needed to advance the performance of Li/S batteries. Here, we designed and synthesized a graphene-like oxygenated carbon nitride (OCN) host material that contains tens of micrometer scaled two-dimensional (2D) rippled sheets, micromesopores, and oxygen heteroatoms. N content can reach as high as 20.49 wt %. A sustainable approach of one-step self-supporting solid-state pyrolysis (OSSP) was developed for the low-cost and large-scale production of OCN. The urea in solid sources not only provides self-supporting atmospheres but also produces graphitic carbon nitride (g-C3N4) working as 2D layered templates. The S/OCN cathode can deliver a high specific capacity of 1407.6 mA h g–1 at C/20 rate with 84% S utilization and retain improved reversible capacity during long-term cycles at high current density. The increasing micropores, graphitic N, ether, and carboxylic O at the large sized OCN sheet favor S utilization and trapping for polysulfides.
Co-reporter:Yu Sun, Xiaofeng Wu, Long Yuan, Meng Wang, Mei Han, Liqun Luo, Beining Zheng, Keke Huang and Shouhua Feng
Chemical Communications 2017 - vol. 53(Issue 16) pp:NaN2502-2502
Publication Date(Web):2017/01/25
DOI:10.1039/C7CC00140A
LaFeO3 films, as photoelectrocatalysts, could be slightly reduced by annealing in an oxygen-deficient atmosphere. The introduced oxygen vacancies increase the electrical conductivity and change their surface band structures which endows LaFeO3 films with a higher oxygen evolution reaction current and a lower overpotential.
Co-reporter:Keke Huang, Xuefeng Chu, Long Yuan, Wenchun Feng, Xiaofeng Wu, Xiyang Wang and Shouhua Feng
Chemical Communications 2014 - vol. 50(Issue 65) pp:NaN9203-9203
Publication Date(Web):2014/06/26
DOI:10.1039/C4CC00023D
A simple treatment of La0.5Sr0.5MnO3 with diluted HNO3 creates more B-sites (rich) on the terminated perovskite surface and improves its catalytic activity toward CO oxidation, and the perovskite catalyst possesses a higher ratio of Mn4+/Mn3+ and thus enhances the O2 adsorption capability, favourable for CO oxidation and catalytic activity.
Co-reporter:Yanyan Du, Yuan Zhang, Keke Huang, Shan Wang, Long Yuan and Shouhua Feng
Dalton Transactions 2013 - vol. 42(Issue 22) pp:NaN8048-8048
Publication Date(Web):2013/03/12
DOI:10.1039/C3DT50141H
Rare-earth niobate and tantalate materials are of considerable interest for use as phosphors, photocatalysts and ionic conductors. We successfully synthesized Ln3MO7 (Ln = Y, Ce, Er, Ho, Tm, Yb and Lu, M = Ta, Nb) nanophosphors by a hydrothermal method using the water-soluble Lindqvist ion polyoxometalates [HNb6O19]7− and [Ta6O19]8− as Nb and Ta sources. The Pawley refinements of these nanophosphors revealed that the Lu3TaO7 and Lu3NbO7 nanophosphors could be indexed in the cubic system with the space group Fmm, and that Y3TaO7 crystallizes in orthorhombic symmetry with the space group of C2221. These three solid compounds are nanoparticles with average particle sizes of 7.5, 5.9 and 4.0 nm for Lu3TaO7, Lu3NbO7 and Y3TaO7, respectively. The photoluminescence properties of Eu3+ doped Lu3TaO7, Lu3NbO7 and Y3TaO7 were studied, and Eu3+/Sr2+ co-doped Ln3MO7 (M = Ta, Nb) has an enhanced emission intensity compared to that of Ln3MO7:Eu3+ (M = Ta, Nb).
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