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采用溶胶凝胶法制成了纳米TiO_2电极,在离子液体中将其应用于3-甲基噻吩的电化学聚合。采用循环伏安法(CV),在线紫外可见光谱(UV-Vis),扫描电镜(SEM)和电化学阻抗谱(EIS)对TiO_2/聚3-甲基噻吩(TiO_2/PMT)复合膜进行了表征并研究了其电化学性质.实验证明,不论是用循环伏安法,恒电位,还是恒电流方法,都能在电极上得到聚3-甲基噻吩(PMT)膜,并伴随有明显的掺杂和去掺杂过程.对应的在线紫外可见光谱上,也出现了氧化和还原两种不同的吸收状态,还原(去掺杂)过程中在480 nm处有一个吸收峰,而氧化(掺杂)过程中此峰消失,取而代之的是一个可见光区的逐渐增强的吸收.PMT膜是p型半导体,TiO_2是n型半导体,两者之间能够形成p-n异质结,使光电转换效率得以提高.SEM给出了TiO_2电极和聚合物修饰的TiO_2的形貌图,电极的交流阻抗谱则从一个角度说明了聚合物膜修饰电极的导电性.
Nanometer TiO_2 electrode was prepared by sol-gel method and applied to the electrochemical polymerization of 3-methylthiophene in ionic liquid. The composite films of TiO 2 / poly 3-methylthiophene (TiO 2 / PMT) were characterized by CV, UV-Vis, SEM and EIS Its electrochemical properties were characterized and studied.Experiments show that poly (3-methylthiophene) (PMT) films can be obtained on the electrodes by either cyclic voltammetry, potentiostatic or galvanostatic methods with concomitant obvious Doping and dedoping process. There are two different absorption states of oxidation and reduction in the corresponding on-line UV-visible spectrum. There is an absorption peak at 480 nm in the process of reduction (dedoping), while the oxidation Miscellaneous) during the peak disappears, replaced by a gradually increasing absorption of the visible light region.PMT film is a p-type semiconductor, TiO_2 is n-type semiconductor, between the two can form pn heterojunction, the photoelectric conversion efficiency can be improved .SEM presents the morphology of TiO 2 electrode and polymer modified TiO 2. The AC impedance spectrum of the electrode shows the conductivity of the polymer film modified electrode from a single point of view.