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采用溶胶-凝胶法制备了多壁碳纳米管(MWCNTs)负载的ITO/MWCNTs-TiO2/ITO复合器件,利用SEM、XPS、UV-Vis光谱等技术对复合样品进行形貌和结构表征,以液相罗丹明B(RhB)的可见光光催化降解为探针反应,评价MWCNTs-TiO2复合薄膜的催化活性.XPS结果表明MWCNTs与TiO2之间没有形成Ti-C键.I-V特性表明负载了MWCNTs的ITO/MWCNTs-TiO2/ITO复合器件的光电流增强.与空白TiO2薄膜相比,MWCNTs-TiO2复合薄膜的可见光光催化降解RhB的速率提高了3.2倍.MWCNTs并没有掺杂到TiO2晶格中,而是起到了类似光敏剂的作用,可在可见光激发下将导带电子转移到TiO导带上,经一系列反应降解RhB有机物.
The multi-walled carbon nanotubes (MWCNTs) loaded ITO / MWCNTs-TiO2 / ITO composite devices were prepared by sol-gel method. The morphology and structure of the composites were characterized by SEM, XPS and UV- The photocatalytic degradation of MWCNTs-TiO2 composite thin film was investigated by visible light photocatalytic degradation of RhB, and the Ti-C bond was not formed between MWCNTs and TiO2. The IV characteristics show that MWCNTs loaded MWCNTs The photocurrent of ITO / MWCNTs-TiO2 / ITO composite device was enhanced.Compared with the blank TiO2 film, the photocatalytic degradation of RhB by MWCNTs-TiO2 composite film increased by 3.2 times.MWCNTs were not doped into the TiO2 lattice, But acts like a photosensitizer, which can transfer the conduction band electron to TiO conduction band under the excitation of visible light and degrade RhB organism through a series of reactions.