(南京航空航天大学 材料科学与技术学院，南京 210016)
摘 要: 在0.5%(质量分数)NH4F/甘油电解液中通过恒压阳极氧化法在钛基体上制备TiO2纳米管阵列。采用循环伏安法、紫外−可见吸收光谱、顺磁共振波谱仪和傅立叶红外谱对TiO2纳米管阵列的表面性能进行了表征。结果表明：TiO2纳米管阵列电极可发生两个光化学过程，测得的电化学激发能∆EOH/•OH＞1.643 V，对应的吸收光波长 λ＜853 nm；TiO2纳米管阵列电极光化学性能变化是由于在电极表面发生Ti3+与Ti4+转化的过程中形成了·OH。
关键字: TiO2纳米管阵列电极；阳极氧化；循环伏安法
anodic oxidation on titanium substrate
（College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China）
Abstract: The self-organized TiO2 nanotube arrays were prepared in 0.5% (mass fraction) NH4F/glycerol by method of anodic oxidation of a pure titanium sheet at a constant potential. The electrodes of TiO2 nanotube arrays were characterized by means of cyclic voltammetry (CV), FTIR, SEM, electron paramagnetic resonance spectrometer (EPR) and UV-vis spectroscopy measurement. The results show that two photoelectrochemical processes can be observed in the TiO2 nanotube arrays electrode. The minimum electrochemical excitation energy of TiO2 electrodes calculated is ∆EOH/·OH＞1.643 V, the corresponding excitation irradiance wavelength λ＜853 nm. Based on the experiment, the mechanism was proposed on the base of these two photoelectrochemical processes. The results show that the changes of photoelectrochemical properties are related with the appearance of surface free hydroxyl when titanium ion produces on the film.
Key words: TiO2 nanotube arrays electrodes; anodic oxidation; cyclic voltammetry (CV)
