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纳米尺度TiO2聚苯胺多孔膜电极光电化学研究 总被引:13,自引:0,他引:13
用光电流作用谱,光电流-电势图等光电化学方法研究了TiO2/聚本胺复合多孔膜电极在不含氧化还原和含有没氧化还原对体系中的光电转换过程。结果说明,TiO2/聚苯胺复合多孔膜电极为双层m-型半导体结构,TiO2多孔膜的禁带宽度为3.2eV,外层聚苯胺膜的禁带宽度为2.88eV。 相似文献
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TiO2纳米晶多孔膜的电荷传输特性 总被引:23,自引:2,他引:23
用光电流作用谱、瞬态光电流、循环伏安及线性电位扫描法研究了TiO2纳米晶/纳米多孔膜电荷传输特性.结果表明TiO2纳米多孔膜的电荷传输与块体半导体不同.TiO2纳米晶电极的能带不弯曲,电子在导带中可向两个方向流动,电子既可以流向电极内部经由外电路输出.也可以流向电解质溶液被溶液中的受主捕获.在TiO2纳米多孔膜电极中,不仅在负电位区能带边随电位变化,而且在正电位区能带边随电位变化而移动,即带边不钉扎。加入合适的施主可提高光电转换效率.加入受主则在电极溶液界面引起电子的严重损失,降低光电转换效率. 相似文献
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电沉积铜钴纳米多层膜的机理研究 总被引:6,自引:0,他引:6
采用动电位扫描,循环伏安以及电化学交流阻抗等方法研究了铜钴米多层膜的电沉积机理,结果表明:在所研究的体系中,铜的沉积是扩散控制的可逆电极过程,而钴的沉积是首先形成Co(OH)ads的吸附中间产物,而后在电极上进一步还原为原子态,基于研究结果,提出了铜钴沉积的机制。 相似文献
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染料敏化的TiO2纳米晶多孔膜的性质及其光电转换 总被引:15,自引:0,他引:15
纳米材料由于粒径小而具有许多特殊的不同于块体材料的性质。用纳米技术制成TiO2纳米晶多孔膜,能作为良好的光电转换的基质。通过选择合适的敏化染料,能达到很高的光电转换效率。本文介绍光电转换的原理,TiO2纳米晶多孔膜的性质与制备及敏化染料的特性。 相似文献
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染料敏化La~(3+)掺杂的TiO_2纳米多孔膜光电化学 总被引:5,自引:0,他引:5
采用水热法合成了La3+离子掺杂的TiO2 纳米粒子 (La3+掺杂量 0 .5mol% ) ,并用光电化学方法研究了Ru(bpy) 2 (NCS) 2 (bpy =2 ,2’_bipyridy1_4 ,4’_dicarboxylicacid)敏化La3+掺杂的TiO2电极 (简写为La3+_TiO2 )的光电化学行为 .实验证明Ru(bpy) 2 (NCS) 2 敏化La3+_TiO2 复合半导体纳米多孔膜电极的光电转换效率和电池能量转换效率随电极的膜厚增加而提高 相似文献
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超薄铜膜包覆的金刚石纳米复合粉体制备与表征 总被引:4,自引:0,他引:4
在氯化亚锡敏化、氯化钯活化的条件下,通过化学镀方法,成功地在纳米金刚石粉体表面制备了超薄铜膜.用X射线粉末衍射(XRD)和傅立叶红外吸收光谱(FTIR)表征了该Cu-金刚石纳米复合材料.此种复合材料在无水乙醇中超声分散5 min后的溶胶可稳定存放半年之久而不见沉降. 相似文献
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本文制备了2,9,16,23-四异丙氧基和2,9,16,23-四对甲基苯氧基2种酞菁铜(CuPc(OC3H7-i)4, CuPc(OC7H7)4,简称为烷氧基酞菁铜和苯氧基酞菁铜),并在基片上成功制得了二者的旋涂膜。利用AFM(Atomic force microscope)、UV-Vis和FTIR对薄膜的表面形貌和谱学性质进行了分析。结果表明,以一定的旋转速度进行涂膜,可以获得较为均匀的酞菁铜薄膜,并且2种取代基团的酞菁表面形貌有着较为明显的差别。在室温下测试了2种酞菁薄膜对甲醇和乙醇气体的敏感性能,结果显示薄膜对测试的醇类有较高的灵敏度,对乙醇的灵敏度要大于甲醇,在同种测试气氛下苯氧基酞菁铜薄膜的气敏性能要高于烷氧基酞菁铜薄膜。2种薄膜对浓度为30 μL·L-1乙醇气体的响应和恢复时间分别在30 s和60 s内。 相似文献
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Shuhan Chen Wei Wen Xue Zhao Zelang Zhang Weishuang Li Yaoyao Zhang Bojie Li Lei Zhu 《Molecules (Basel, Switzerland)》2022,27(22)
Here, we describe the preparation of copper nanoparticles that are stabilized on a chitosan composite film (CP@Cu). This material could catalyze the 1,6-hydroboration reactions of p-quinone methides with B2pin2 as a boron source under mild conditions. This reaction exhibited very good functional group compatibility, and the organoboron compounds that were formed could easily be converted into corresponding hydroxyl products with good to excellent yields. This newly developed methodology provides an efficient and sequential pathway for the synthesis of gem-disubstituted methanols. 相似文献
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将氯化铜加入到紫精/聚乙烯吡咯烷酮中,制得了一种可快速褪色、光疲劳性能优异的紫精/聚合物光致变色薄膜,测试了该薄膜的变色性能、褪色性能及光疲劳性能.结果表明,氯化铜的加入使薄膜初次紫外光照时的颜色变浅,但加快了薄膜褪色;当氯化铜与紫精摩尔比为1:1、60℃褪色时,薄膜光照后在610 nm处吸光度的半衰期为9 min,而不合氯化铜的薄膜为54 min,氯化铜含量越高,半衰期越短.含有氯化铜的薄膜,随变色/褪色循环次数增加,光照后的显色加深,氯化铜含量越高,颜色增加的程度越大.该功能薄膜可用于信息存储、太阳镜及智能窗等方面. 相似文献
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T-ZnO晶须化学镀铜复合粉体的制备及其电磁性能的研究 总被引:11,自引:0,他引:11
采用化学镀的方法制备了Cu包覆四脚状氧化锌晶须(T-ZnO晶须)的复合粉体.使用X射线衍射分析仪(XRD)进行了物象分析,扫描电镜(SEM)观察了粉体的形貌.运用能谱仪(EDS)进行了成份分析.结果表明,晶须为纯氧化锌,晶体结构为六方晶系纤锌矿结构,镀层为纯铜. SEM观察晶须外观形貌为四脚状结构.同时使用波导法对T-ZnO晶须和化学镀铜得到的Cu/T-ZnO晶须复合粉体进行了电磁参数的测量.微波电磁性能试验表明,化学镀后晶须的微波吸收性能明显增加,在频率为13 GHz处反射率可达-12 dB左右,而且最大吸收峰的频率随铜析出量的不同而发生改变,这样有利于实现吸收频带的展宽. 相似文献
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Electroless Copper Plating on Liquid Crystal Polymer Films Using Dimethylamine Borane as Reducing Agent 下载免费PDF全文
Dimethylamine borane (DMAB) was used in electroless copper plating on liquid crystal polymer (LCP) films. An orthogonal test was applied to optimize the plating condition. With Cu film resistivity as the evaluation index, the optimum plating condition is: 10 g/L of CuSO4 ? 5H2O, 14 g/L of EDTA‐2Na, 6 g/L of DMAB, 9.5 of pH value and 50 °C. As pH value increases, the Cu film resistivity decreases and the depo‐ sition rate increases. As temperature increases, the Cu film resistivity decreases first and then increases with a minimum at 50 °C while the deposition rate increases first and then decreases with a maximum at 50 °C. The decreased Cu film resistivity can be attributed to the occurrence of CuO. The adhesive strength of copper layer to LCP film is constant at pH values lower than 8.5 and decreases slightly with the increase in pH value. As temperature increases, the adhesive strength decreases slightly. The decreased adhesive strength with both pH and temperature may be a result of an increased corrosion attack from the bath to the surface of LCP films. Low Cu film resistivity and high deposition rate as well as high adhesive strength can be obtained using DMAB reducing agent. 相似文献
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Oxidation of Organosilanes with Nanoporous Copper as a Sustainable Non‐Noble‐Metal Catalyst 下载免费PDF全文
Although many noble‐metal catalysts have been used for the oxidation of organosilanes, there has been less success with non‐noble‐metal catalysts. Here, unsupported nanoporous copper (np‐Cu) is used to catalyze the oxidation of organosilanes under mild conditions. It is the first time that this reaction has been achieved with a heterogeneous copper catalyst with high activity and selectivity. Both water and alcohols are used as oxidants and the corresponding organosilanols and organosilyl ethers are obtained in high yield. The possible mechanism was obtained by kinetic studies. The catalyst could be reused at least five times without evident loss of activity. As a novel green catalyst np‐Cu should play a unique role in organic synthesis. 相似文献