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由非离子型Gemini表面活性剂TMDD(HO(EO)xC14(EO)yOH)为结构导向模板, 改进EISA(挥发诱导自组装)镀膜工艺经300 ℃焙烧制得具有连续、均一和光学透明特点的蠕虫介孔纳米晶孔壁氧化钨薄膜. 采用SEM、TEM和Raman光谱对此种薄膜的介孔纳米结构进行了表征, 通过光谱电化学、XPS和椭偏谱等方法, 研究了该薄膜在电解质溶液中的电致变色行为. 结果表明, 所制备的纳米结构氧化钨薄膜在633 nm波长处的循环可逆透过率调制幅度可达75%以上, 并且其电致变色机理具有显著的双注入吸收调制特性. 相似文献
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近年来 ,随着人们提倡节能和使用洁净能源 ,无机电致变色材料在建筑物采光控制系统和反射率可调表面的应用研究 ,已成为材料领域的一个新热点 .WO3、 MoO3等过渡金属氧化物薄膜具有良好的电致变色效应 ,是人们研究的重点 .其中 MoO3的电致变色效果要好于 IrO2、 TiOx、 CoO及 NiOx等电致变色材料 [1],而且它在可见光区有比 WO3更柔和的色彩 ,使人眼更易于适应其颜色变化 .着色态的 MoO3称为钼青铜 ,其开路记忆也好于钨青铜 [2].故 MoO3电致变色薄膜是极有潜力用于实用化的电致变色器件 .MoO3薄膜常用的制备方法有真空蒸 发、化学气… 相似文献
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以硝酸锌和尿素为原料,采用共沉淀法在α-Al2O3微滤膜孔内表面制备了纳米ZnO涂层.实验考察了反应物浓度、反应温度和反应时间对纳米ZnO涂层显微结构的影响规律,同时结合TEM对该涂层的显微结构进行观察分析.结果表明:当硝酸锌浓度为0.3 mol/L、尿素浓度为0.6 mol/L、反应温度为95 ℃、反应时间为4 h时,ZnO涂层的晶粒细小均匀、结构致密且表面具有良好的平整度.采用该ZnO涂层改性后的α-Al2O3微滤膜,其过滤效率得到了明显提高,水通量最大增幅达到45.6;. 相似文献
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微等离子体氧化Al2O3陶瓷膜的组织结构与形成过程 总被引:4,自引:0,他引:4
The alumina ceramic coatings were prepared on aluminum alloy using micro-plasma oxidation. The structure and morphologies of ceramic coatings were studied by X-ray diffraction (XRD) and scanning electron microscope (SEM), and then its formation process was investigated. The results of XRD reveal that with increasing oxidation time the content of γ-Al2O3in the ceramic coatings decreases, and in which the content of α-Al2O3increases. The results of SEM show that many crater-mouth like traces formed by the plasma discharge are observed on the coatings surface, it indicates when the plasma is discharging, a plasma thermal chemical reaction occurs between the aluminum from the substrate and the oxygen and other ions from the electrolyte. The reaction products then are propelled away from the inner-wall of the discharging channels. Finally, these products agglomerate in the inner-wall of the discharging channels and on the surface near the discharging channels to produce the ceramic coatings. The change of ceramic coatings thickness with increasing oxidation time divides into two stages, and the final thickness is formed in first stage. With increasing current density the final thickness of ceramic coatings increases. 相似文献
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Nanocrystalline V2O5 thin films were reactively radio-frequency magnetron-sputtered under optimal deposition parameters. Their electrochemical and electrochromic characteristics were investigated by cyclic voltammetry and in-situ monochromatic transmittance measurements. Upon lithium intercalation, V2O5 thin films showed a double electrochromic behavior depending on the wavelength and the intercalation extent. X-ray photoelectron spectroscopy results showed that part of the V5+ in V2O5 was reduced to V4+ during the Li+ intercalation process. 相似文献
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MoO3电致变色薄膜的XPS研究 总被引:5,自引:0,他引:5
Molybdenum oxide films were fabricated successfully by spin coating from Li+ doped peroxo polymolybdate solution via sol gel technique.Their electrochemical and electrochromic properties were investigated by cyclic voltammetry and in situ UV transmittance measurements.The results showed that the films possessed excellent electrochemical stability and reversibility.The electrochromic mechanism of the MoO3 was discussed by using results obtained from X ray photoelectron spectroscopy (XPS).The results showed that the most part of the Mo6+ in MoO3 film was reduced to Mo5+ and Mo4+ ions during the Li+ intercalation process,Mo4+ was oxidized to Mo5+ and part of Mo5+ was oxidized to Mo6+ again during the Li+ deintercalation process.So it was considered that Mo4+ ions existed in the colored MoO3 films. 相似文献
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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