Synthesis and Characterization of (PEO)_x~-(V_(0.85)Mo_ (0.15)_2O_5 Nanocomposite Films

1　IntroductionSomeinorganiclayeredcompounds ,suchasMoO3 andV2 O5,belongtoarapidlygrowingfieldofcontempo raryresearchinterest,becausetheycanbeintercalatedbyavarietyofalkaliions (Li+ ,Na+ ,etc .) ,atomsorlargermoleculestoformintercalationhost guestcompounds ,whichareexpectedtobepromisingcandidatematerialsforcathodesofsecondaryLibatteriesandelectrochromicdevices[1] .Polymer layeredoxidenanocompositesareat tractingmuchattentionduetotheirspecialstructureaswellassuperiorelectrical,electrochemical…     

Nanocomposite films of V<Subscript>2</Subscript>O<Subscript>5</Subscript>−MoO<Subscript>3</Subscript> xerogel with poly ethylene oxide intercalation

Poly ethylene oxide (PEO)_x−V₂O₅−V₂O₅−MoO₃ (x=0, 0.5, 1) films were prepared by the sol-gel method. The synthesis and structure of the films were investigated by XRD, TG-DTA, FTIR, etc. The results show that V₂O₅−MoO₃ xerogel has a layered structure and its interlayer space increased from 1.3181 nm at x=0 to 1. 7898 nm at x=1 after the nanocomposite films were dried, and PEO in the interlayer changes the interface structure by forming hydrogen bonds with V=0 bands. CV measurement indicates that the intercalation of PEO improves insertion/extration properties of Li⁺ ions in the interlayer. ZHENG Jin-xia: Born in 1976 Funded by the National Natural Science Foundation of China (No. 50172036) and Natural Science Foundation of Hubei Province(No. 2001ABB083)     

THE NANOCOMPOSITE FILM OF POLYMER INTERCALATION IN V_2O_5 XEROGEL

The nanocomposite films were prepared by poly(ethylene oxide), PEO, intercalation in V_2O_5 xerogel in sol-gel. The synthesis and state of the films are in vestigated by the XRD, IR, SEM, etc. The results show that V_2O_5 xerogel is a layered structure which arranges in c-direction. The interlayer distance of V_2O_5 xerogel increases remarkably when PEO is intercalated in V_2O_5 xero gel interlayer. PEO has strong interaction with V_2O_5 host. The surface of the films is homogeneous without holes and cracks.     

Synthesis and characterization of (PEO)<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript>−(V<Subscript>0.85</Subscript>Mo<Subscript>0.15</Subscript>)<Subscript>2</Subscript>O<Subscript>5</Subscript> nanocomposite films

(PEO) _x −(V_0.85Mo_0.15)₂O₅(x=0,0.5,1.0) nanocomposite films were prepared by a modified sol-gel method. The structure of the films was analyzed by XRD, and the DC electrical conductivity. Cyclic voltammogram and optical spectral transmittance were investigated. The results show that the (V_0.85Mo_0.15)₂O₅ xerogel has a layered structure and its interlayer space increased from 1.3181 nm at x=0 to 1.7897 nm at x=1.0. The introduction of MoO₃ improved the DC electrical conductivities of the films due to the generation of V₄₊ to maintain the electrical neutrality of the oxides. PEO intercalated in the interlayer of (V_0.85Mo_0.15)₂O₅ oxides has interaction with the oxides, enhancing the amount of Li⁺ ions inserted into the interlayer of the oxides. Moreover, the intercalation of PEO into the interlayer of (V_0.85Mo_0.15)₂O₅ oxides improved the cathodic electrochromic property in near ultraviolet region and anodic electrochromic property in visible range. JIANG Cong-sheng: Born in 1963 Supported by the Science Foundation of Hubei Province (Grant No. 2001ABB083)     

Lithium Insertion in Poly(ethylene oxide)/MoO_3 Xerogel Nanocomposite Films

1　ＩｎｔｒｏｄｕｃｔｉｏｎＧｒｅａｔｅｆｆｏｒｔｓｈａｖｅｂｅｅｎｍａｄｅｉｎｒｅｃｅｎｔｙｅａｒｓｔｏｄｅ ｖｅｌｏｐｎｅｗｉｎｔｅｒｃａｌａｔｉｏｎｈｏｓｔ ｇｕｅｓｔｃｏｍｐｏｕｎｄｓｗｉｔｈｎｏｖｅｌｐｒｏｐｅｒｔｉｅｓａｓｍａｔｅｒｉａｌｓｆｏｒｅｌｅｃｔｒｏｃｈｒｏｍｉｃｄｅｖｉｃｅｓａｎｄｓｅｃ ｏｎｄａｒｙｌｉｔｈｉｕｍｂａｔｔｅｒｉｅｓ[1- 4] .ＣｏｍｐｏｕｎｄｓｂａｓｅｄｏｎＭｏＯ3 ｈａｖｅａｔｔｒａｃｔｅｄｍｏｒｅａｔｔｅｎｔｉｏｎｄｕｅｔｏｔｈｅｉｒｄｅｓｉｒａｂｌｅｃｈａｒ…     

Lithium Instertion in poly (ethylene oxide )/MoO3 Xerogel Nanocomposite Films

The nanocomposite films were prepared by direct intercalation of poly (ethylene oxide) and PEO into MoO3 xerogel via sol-gel route,The electrochromic behavior and the chemical conditionws of Li^ ions were investigated by cyclic voltammograms,UV-visible spectral transmittance and XPS,The tesults show that the cycling efficiency and the reversibility of insertion/extraciton of Li^ ions in (PEO)1 MoO3 .nH2O nanocomposite film were improved.The intercalation of PEO into MoO3 xerogel modulated the wavelength range of electrochromism and enhanced the electrochromic efficiney,Two different chemical conditions of Li^ ions existing in the interlayer and interstitial positions of MoO3 lattice were observed in MoO3 XEROGEL AND (PEO)1 MoO3.nH2O naocomposite films.     

Pd/V_2O_5薄膜的氢气敏感性质研究

采用磁控溅射法制备了不同厚度的Pd/V2O5双层复合薄膜,采用紫外-可见光分光光度计研究了薄膜的氢气敏感性质,原位测量了薄膜的激光拉曼光谱并分析了薄膜的氢气敏感机理。结果表明,复合薄膜V2O5(280 nm)/Pd(30nm)对氢气的敏感性质较好,对0.01%H2-N2有响应,在4%H2-N2标气中,在560 nm处透过率的相对变化值达到25%。拉曼光谱分析结果表明,Pd/V2O5薄膜在与氢气作用过程中,Pd膜主要起催化作用,氢原子扩散到V2O5层,V5+转变为V4+,导致Pd/V2O5薄膜的透过率发生变化。     

新型五硼酸盐的熔盐合成及结构表征

通过低温熔盐法合成了一种新型五硼酸盐RbB5O7（OH）2·H20,单晶X射线衍射结果证明该化合物属单斜晶系,P2／c空间群,α=0．7640（2）nm,b=0．9019（3）nm,c=1．0833（3）nm,β=103．681（5）°,V=0．7252（4）nm^3,Z=2．结构中BO3,BO2（OH）2,BO4基团形成的[B5O7（OH）2]之字链结构与RbO＋相连构成九面体-四面体空间骨架,水分子靠近之字链结构通道内侧,起到稳定骨架的作用．同时通过X粉晶衍射、红外光谱、热重等对化合物进行了表征．     

新型杂化材料[(CH_2)_5NH_2]_3[PMo_(12)O_(40)]·3[(CH_2)_5NH]水热合成与晶体结构

采用水热合成方法制备了有机．无机杂化材料[(CH2)5NH2]3[PMo12O40],晶体结构解析表明,该晶体属正交晶系,Pnma空间群．结晶学参数α=2．4486(2)nm,b=2．1202(3)nm,c=1．193 1(4)nm,β=90．00(0)°,V=6．194 2(9)nm3,Z=4,R=0．061 1,Rw=0．157 3．化合物分子由1个Keggin结构的杂多阴离子PMo12O403-,4个质子化的哌啶构成,十二钼磷酸阴离子和质子化的哌啶分子通过静电引力和氢键相互作用．     

Synthesis and Properties of a One-Dimensional Mixed-Ligand Cd(Ⅱ) Complex with Helical Structure

The title complex,[[Cd(Him)(OH-BDC)(H2O)2]·3H2O]n(1) (Him is imidazole,OH-H2BDC is 5-hydroxyisophthalic acid),was synthesized by liquid/liquid diffusion method at room temperature.The complex crystallizes in orthorhombie,space group P212121,with a = 0.671 6(7),b = 1.380 6(2),c =1.7421(2) nm,V = 1.615 2 (3) nm3,C11 H18 CdN2O10,Mr = 450.67,Dc = 1.853 g/cm3,μ =1.407 mm-1,F(000) = 904,Z = 4,the final R1 = 0.020 9 and wR 2 = 0.045 3 for 3 211 observed reflections (Ⅰ＞ 2σ (Ⅰ)).In the structure of 1,the OH-BDC ligands exhibiting bis-bidentate coordimtion mode bridge the adjacent Cd centers to form a one-dimensional helical chain and the second ligand Him acting as terminal ligands are attached to the helical chain.It is notable that a series of complicated hydrogen bonds (e.g.,N-H ...O,O-H...O) exist in the structure,which link neighboring helices into a three-dimensional supramolecular architecture.An observed intense blue luminescence with an emission band peaking at 390 nm for 1 may be resulted from ligand-to-metal charge transfer (LMCT).     

Molecular Structure of Aminoguanidine Sulfate Monohydrate

Aminoguanidine(guanylhydrazine)is an i mpor-tant chemical material,and is widely used inmedicines,pesticides,explosive,vesicant and finechemicals.Its molecule is rich in nitrogen and con-sists of a hydrazine group,an i mino group and anamino group,which determine its lively chemical re-activity.This compound is interesting in the sensethat it has apparently a lowtoxicity level,and func-tions as aninhibitor of the Maillard reaction.The re-action between nitrile groups of acrylonitrile/vinyl ac-…     

Effect of catalyst on structure of (PEO)8sLiClO4-SiO2 composite polymer electrolyte films

(PEO)8LiClO4-SiO2 composite polymer electrolytes(CPEs) were prepared by in-situ reaction, in which ethyl-orthosilicate (TEOS) was catalyzed by HC1 and NH3·H2O, respectively. The ionic conductivity, the contact angle and the morphology of inorganic particles in the CPEs were investigated by AC impedance spectra, contact angle method and TEM. The conductivities of acid-catalyzed CPE and alkali-catalyzed CPE are 2.2×10-5 and 1.1×10-5 S/cm respectively at 30 ℃. The results imply that the catalyst plays an important role in the structure of in-situ preparation of SiO2, and influences the surface energy and conductivity of CPE films directly. Meanwhile, the ionic conductivity is related to the surface energy.     

一个新型氰根桥联铁(Ⅲ)一铜(Ⅱ)大环配位聚合物的合成和晶体结构

合成了新型大环配位聚合物[Cu(L)]2[Fe2(H2O)(CN)10]·8H2O(L=1,8-二正丙基-1,3,6,8,10,13-六氮杂-14-冠-4),用元素分析、ICP分析、IR光谱对配合物进行了表征,X-射线衍射测定了其单晶结构．结果表明,该晶体属正交晶系,Pddd空间群,a=1．8310(4)nm,b=2．6060(5)nm,c=3．1680(6)nm,α=β=γ=90°,V=15.116(5)nm3,Z=8,dc=1．085 g/cm3,F(000)=5200,R1=0．1024,WR2=0．2657,GOF(F2)=0．992．该配合物结构中氰根桥联铁(Ⅲ)和铜(Ⅱ),形成Fe-CN-Cu-NC-Fe－维链,链与链之间经由Fe-O(H2O)-Fe而相互联结,形成相互交叉的网状结构．铁和铜均形成6配位畸变8面体构型．     

THE STRUCTURE AND ELECTRICAL PROPERTIES IN POLYMER-LAYERED SILICATE NANOCOMPOSITES

The polymer-layered silicate nanocom-posites(PLSN) are prepared by the polymer melt interca lation in layered silicate. By the analyses of XRD, DSC, IR, NMR and AC impedance measurements etc, the experimental results show that polymer (PEO) can intercalate into the silicate interlayer in melt state, which leads to the addition of the repeated distance of silicate. The polymer (PEO) structure in the interlayer is similar to that oj PEO melt. The polymer(PMMA) can sol utilize in melt PEC) and intercalate into silicate interlayer with PEO chains together. The modification of PMMA in PLSN further enhances the random arrangement of PEO chains, which are much inclined to random amorphous state. This random amor phous state is beneficial to the ionic migraton in the interlayer. The intercalation of polymer (PEO) and modifi-cation of PEO with PMMA can remarkably enhance the ionic conductivities at room temperature and decrease the apparent conducting activation energies in PLSN.     

固溶体电报材料—钒青铜型结构Li_xV_2O_5的合成与性能研究

以LiVO_3、V_2O_5、V_2O_3为原料,在600℃、氮气氛中经32h固相反应合成的βLi_xV_2O_5(0.3≤x≤0.6),在200～400℃电池电化学反应过程中,其β-钒青铜型结构不变。这说明βLi_xV_2O_5是一种结构稳定的二次电池固溶体电极材料。     

Hydrothermal Synthesis of [ Mn5（H2PO4）2（PO4）2（H2O）4]Templated by Calixarene Under Mild Conditions

Meso-and microporous materials are of great in-terest from both the industrial and academic pointof view due to their catalytic , adsorbent , and ion-exchange properties .Inthis way,phosphates of tran-sition metals represent aninteresting group of materi-als owning to their channel structure .Calixarene are macrocyclic molecules in whichseveral phenolic units are linked via —CH2— or—S— bridges at their ortho positions . Calixarene-based receptors are among the most effective and se-lectiv…     

Fabrication of GaN films through reactive reconstruction of magnetron sputtered ZnO/Ga_2O_3

1　INTRODUCTIONGallium nitride (GaN) is one of the most po tential semiconductors. GaN has a direct energyband gap of 3.4 eV at room temperature and highexternal photoluminescence quantum efficiency, aswell as a high excitonic binding energy of20 meV[1]. It is an ideal material for fabrication ofultraviolet(UV)/blue/green light emitting diodes(LEDs), laser diodes(LDs), UV detectors and de vices operating in high temperature, high frequen cy and high power co…     

V_2O_5/V/V_2O_5薄膜退火条件对其的制备及特性的影响

利用间歇通O2的方式,采用射频磁控溅射法在Si3N4衬底上制备V2O5/V/V2O5复合薄膜,研究了不同原位退火条件对薄膜阻值及电阻温度系数(TCR)的影响。结果表明,经过退火处理后的V2O5/V/V2O5复合薄膜方阻值大大降低,电阻-温度曲线呈现良好的线性特性,并具有高TCR值及优良的电学稳定性。利用X射线光电子能谱(XPS)对退火后的V2O5/V/V2O5复合薄膜表面进行V、O元素分析,结果表明,V2O5/V/V2O5复合薄膜各层间的扩散效果显著影响薄膜表面不同价态V离子的含量,低价V离子会随着退火温度的升高及退火时间的延长而增多,薄膜表面对水分子的吸附也随之变强。在实验结果的基础上,利用扩散理论阐述了退火条件对V2O5/V/V2O5复合薄膜电学性能影响的机理。     

Ti6Al4V合金表面纳米管阵列的制备

以氢氟酸和铬酸为电解液,采用阳极氧化法在Ti6Al4V合金表面制备高密度的纳米管阵列.利用场发射扫描电镜、X射线衍射仪和X射线光电子能谱对多孔氧化膜的形貌和结构进行分析,利用极化曲线和电化学阻抗谱研究了电解液中CrO3的作用机理.结果表明:电解液种类决定能否形成多孔氧化膜,而电解液的浓度影响多孔氧化膜的形貌和孔径大小;纳米管阵列氧化膜主要由大部分非晶态组织的TiO2,Al2O3和少部分晶态的Al2TiO5,Al3Ti5O2,Al2O3组成,氧化膜内的Al,Ti原子比高于基体中的Al,Ti原子比;CrO3浓度的高低会影响氧化膜的结构.     

STRUCTURAL AND FERROELECTRIC PROPERTIES OF A NEW NIOBATE : Sr6FeNb9O30

A new niobate Sr_6FeNb_9O_(30) was synthesized in the ternary system SrO-Fe_2O_3-Nb_2O_5 for the first time. The crystal structure was determined by X-ray diffraction and dielectric measurement, and it belongs to orthorhombic tungsten bronze structure at room temperature with unit cell parameters a=1.7554(1) nm, b=1.7534 (1) nm, c=0.77870 (6) nm. Dielectric constants measurement show that Sr_6FeNb_9O_(30) has two phase transitions, paraelectric to ferroelectric at 185C and ferroelectric to ferroelastic at 70C.