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介孔氧化钨电色薄膜的制备与性能研究 总被引:2,自引:0,他引:2
采用一种新的非离子型gemini表面活性剂结构导向模板, 成功制备了介孔氧化钨薄膜. 通过SAXRD, TEM和N2吸附-脱附等方法考察薄膜的制备和微结构特性, 发现获得的产物具有三维蠕虫介孔结构, 比表面积可达145.5 m2• g-1. 测定了该薄膜在无水高氯酸锂/碳酸丙烯酯电解质溶液中的循环伏安和电致变色性能, 并与无模板薄膜进行了对比研究. 研究表明, 由于具有更大的电化学活性比表面, 纳米介孔氧化钨薄膜表现出增强的电色性能, 在633 nm波长处的透过率调制幅度可达60%以上, 着色效率为51.7 cm2•C-1. 相似文献
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氧化铑变色薄膜的制备及其电变色研究 总被引:4,自引:0,他引:4
采用溶胶-凝胶方法制备了氧化铑电致变色薄膜。通过施加阴极或阳极电位, 薄膜在碱性电解液中呈现从亮黄(还原态)到深绿(氧化态)的可塑颜色变化,而 且可达到上千次循环而性能不变。采用XRD,SEM,TG,DTA,UVV,FTIR和循环伏安 等技术对薄膜的晶态、形貌、热处理过程和电变色过程进行了研究。得出100 ℃处 理的膜内含有一定量的结晶水,其性能最好。对薄膜的电致变色性能如:着色效率 、响应时间及循环寿命、开路记忆等进行了测试,并讨论了氧化铑薄膜电变色的反 应机理。 相似文献
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本文利用阴极化电沉积法在抛光镍极及ITO玻璃表面制备了含Co量为16.2%的NiOxHy薄膜,薄膜厚度分别为42nm、21nm,采用透射光谱以及线性电位扫描、交流阻抗和阳极稳态极化曲线等测试技术,考察了Co对NiOxHy薄膜电致变色性能的影响,光谱测试范围为300 ̄2500nm。结果发现:Co能降低薄膜着色态在可见光区及部分近红外区的透过率,通过电压调节不仅可以调光而且可望能够控温;同时Co还能降 相似文献
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PEO掺杂氧化镍薄膜的溶胶-凝胶法制备及电致变色性能研究 总被引:1,自引:0,他引:1
以无水醋酸镍、乙醇为前驱液, 加入适量正丁醇及PEO2000等为稳定剂, 采用改进的溶胶-凝胶法制备了稳定的PEO2000纳米Ni(OH)2复合溶胶体系, 采用旋涂法在ITO (In2O3∶Sn)导电玻璃上形成均匀的氧化镍薄膜. 研究了溶胶组分对成膜性能的影响, 采用TG-DSC分析、X射线衍射仪和扫描电镜, 研究了热处理过程中的结构变化和表面形貌. 循环伏安和可见光透过率测试表明该氧化镍薄膜具有良好的电致变色性能和阳极着色效应. 相似文献
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二水合氧化钨(WO3·2H2O)因其独特的层状结构且富含层间结构水,与无水WO3相比显示出更加优异的电致变色性能。我们采用简单、无模板的阴极电化学沉积方法,成功在氧化铟锡(ITO)导电玻璃基底上制备了WO3·2H2O薄膜。通过改变电沉积液中过氧化氢(H2O2)的加入量优化沉积液的成分,获得了具有纳米多孔结构的薄膜。由此制备的WO3·2H2O薄膜显示出大的光学对比度(633 nm处的光学对比度大于90%)、快速的响应速度(着色、褪色时间均小于10 s),以及良好的循环稳定性(经10 000次循环后,光学对比度仍保持在90%左右)。 相似文献
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二水合氧化钨(WO3·2H2O)因其独特的层状结构且富含层间结构水,与无水WO3相比显示出更加优异的电致变色性能。我们采用简单、无模板的阴极电化学沉积方法,成功在氧化铟锡(ITO)导电玻璃基底上制备了WO3·2H2O薄膜。通过改变电沉积液中过氧化氢(H2O2)的加入量优化沉积液的成分,获得了具有纳米多孔结构的薄膜。由此制备的WO3·2H2O薄膜显示出大的光学对比度(633nm处的光学对比度大于90%)、快速的响应速度(着色、褪色时间均小于10s),以及良好的循环稳定性(经10000次循环后,光学对比度仍保持在90%左右)。 相似文献
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Stable tungsten oxide coating sols suitable for electrochromic applications were prepared by a modified peroxotungstic acid route. Layers up to 250 nm thickness could be deposited on ITO-coated and/or FTO-coated glass substrates in a single dip-coating process. Optoelectrochemical measurements were employed to determine the variation of the electrochromic properties (change in optical density (OD) and switching times) of WO3-layers, investigated as a function of coating parameters, such as chamber humidity and the temperature of heat treatment. High resolution transmission electron microscopy (HR-TEM) has shown that the optimized layers possess a partially crystalline morphology with nanocrystalline regions 2–3 nm in size. 相似文献
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以两亲性共聚物为模板溶胶-凝胶法制备WO3多孔薄膜及其 氢致变色特性的研究 总被引:1,自引:0,他引:1
报道了以六氯化钨为原料, 以两亲性的无规共聚物聚苯乙烯-co-聚烯丙醇(PS-co-PAAL)和三嵌段共聚物聚氧乙烯-b-聚氧丙烯-b-聚氧乙烯(PEO-b-PPO-b-PEO)为模板, 采用溶胶-凝胶法制备了WO3多孔薄膜. 利用热重分析仪(TGA)、粉末X射线衍射仪(XRD)、扫描电子显微镜(SEM)、原子力显微镜(AFM)等表征手段, 研究了模板和热处理温度对薄膜孔结构的影响; 并通过H2敏测试以及利用紫外可见分光光度计(UV), 研究了薄膜的氢敏性能和着色前后的透射光谱. 结果表明, 以无规共聚物PS-co-PAAL为模板制得的WO3薄膜, 经400 ℃热处理后, 可得到呈交联网状的多孔结构, 并表现出最佳的氢致变色性能. 相似文献
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M. Picquart S. Castro-Garcia J. Livage C. Julien E. Haro-Poniatowski 《Journal of Sol-Gel Science and Technology》2000,18(3):199-206
In the course of the preparation of WO3 by sol-gel technique we have studied kinetics of its synthesis and the structural changes during gelation. In-situ Raman scattering spectra were obtained for a series of samples during the transition from aqueous solution to gel. The changes in the Raman features were monitored as a function of time during gelation. The removal of water molecules affects the symmetric W=O stretching mode. The Raman spectrum of a gelified sample shows peaks attributed to the O–W–O bending mode and the disappearance of the high-frequency mode attributed to polyanionic species. After two days the gelified sample became a precipitated material, which exhibited the Raman spectrum of a crystalline tungsten oxide hydrate. 相似文献
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Rao A.V. Prasada Paik Dong Soo Komarneni S. 《Journal of Sol-Gel Science and Technology》1997,10(2):221-229
Powders and thin films of barium sodium niobate, Ba4Na2Nb10O30, of filled tungsten bronze type ferroelectric were processed by a sol-gel route using barium metal, niobium ethoxide and sodium methoxide as precursors. Polycrystalline powder resulted after heat treating the gel powder at or above 650°C. Thin films of Ba4Na2Nb10O30 showed no preferred orientation on Si(100), Pt/Si(100) and sapphire substrates. Hysteresis measurements at 1 kHz for the thin films annealed at 750°C, obtained using a prehydrolyzed precursor solution, and gave remanent polarization of 17.34 µC/cm2 and coercive field of 62.5 kV/cm. Microstructural investigation of surface morphology of these films revealed grains about 0.3 µm in size. Prehydrolysis of the precursor solution was found to be necessary to achieve dense films with ferroelectric properties. 相似文献
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Sun Jiebing Xiong Rui Wang Shimin Tang Wufeng Tong Hua Shi Jing 《Journal of Sol-Gel Science and Technology》2003,27(3):315-319
This paper presents a new sol-gel process to prepare molybdenum oxide thin films. A molybdenum acetylacetonate sol was prepared by employing the system CH3COCH2COCH3/MoO3/C6H5CH3/HOCH2CH2OCH3. A molybdenum acetylacetonate gel was prepared by addition of aqueous NH3. Thermal gravimetry (TG) and differential thermal analyses (DTA) of the gel suggested that crystallization of MoO3 occurs in a 140 K temperature range around 508°C. MoO3 films were prepared on fused silica, Si (111) and Al2O3 (012) substrates by annealing spin coating films of the sol in oxygen environment at 508°C. X-ray diffraction (XRD) showed that all films crystallize in -MoO3 structure, and crystallites on fused silica substrate are arbitrarily oriented while those on Si (111) and Al2O3(012) substrates oriented in the (010) direction. SEM investigations showed that MoO3 grains of all films are randomly distributed, with a longitudinal dimension of about 1–5 m and the film thickness is about 1 m. 相似文献
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Djaoued Y. Badilescu Simona Ashrit P.V. Bersani D. Lottici P.P. Brüning R. 《Journal of Sol-Gel Science and Technology》2002,24(3):247-254
TiO2 nanocrystalline thin films with varying degree of porosity have been prepared using a low temperature method. TiO2 films of the anatase form have been obtained by using a polyethylene glycol (PEG) modified sol-gel method. Densification and crystallization of the films was found to result from the thermal treatment of the dip coated films in boiling water. The films have been characterized by Raman, XRD, FTIR, AFM and optical methods. Highly transparent films with transmission in excess of 85% and porosity as high as 58% are formed predominantly of anatase crystallites of dimensions of the order of 5 nm. Initial results on lithium intercalation into these films resulting in an efficient optical modulation in the visible and near infrared regions demonstrate a good potential of these films for electrochromic applications. 相似文献
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Xiaorong Fu Zhitang Song Guangming Wu Jipo Huang Xinzhong Duo Chenglu Lin 《Journal of Sol-Gel Science and Technology》1999,16(3):277-281
MgO thin films have been prepared on Si substrates by a novel and simple sol-gel method using magnesium nitrate and collodion as starting material. Solutions consisting of magnesium nitrate in a mixture of collodion and ethanol were spin-coated onto silicon substrates. It was found that collodion was a necessary component to form stable sols and the crystallization and structures were clearly dependent on the amount of the collodion and the annealing temperature. The MgO thin films with good crystallization were obtained after annealing at 800°C. Meanwhile, the microstructure of the MgO films was examined by transmission electron microscopy and atomic force microscopy. 相似文献
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The ion exchange route was first successfully used by Livage et al. for depositing WO3 films exhibiting reversible electrochromic effect. We report in this paper the preparation of a solid precursor material by chemically modifying this route. The short lived ion exchange derived sol on addition of H2O2 and acetic acid on further processing, yields a solid precursor material with (1) unusually enhanced stability and (2) easy solvation in alcohol. UV and infrared spectroscopic investigations give strong evidence for these two properties as manifestations of the lower degree of polymerization and coordination of the acetate ion as a chelating ligand with the tungsten atom. 相似文献
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采用溶胶凝胶-浸渍提拉法,制备了玻璃基底上生长的Fe/TiO2薄膜.利用XRD、XPS、AFM等对样品进行表征,研究了铁掺杂对TiO2薄膜晶体结构和表面形貌的影响,并研究了不同掺铁量TiO2薄膜对大肠杆菌的抗菌性能.结果表明,铁掺杂TiO2薄膜的抗菌性能均优于纯TiO2薄膜,其中掺铁量为0.1%时薄膜的抗菌性能最佳,高达98%. 相似文献