甘油-DMSO-H2O中阳极氧化TiO2纳米管阵列的生长与性能

采用NH4F-甘油-DMSO(二甲基亚砜)-H2O溶液体系的电化学阳极氧化法, 在金属钛基板上形成厚度为0.4-1.5 μm的有序TiO2纳米管阵列薄膜. 利用场发射电子扫描显微镜(FESEM)技术, 研究了电解液的组成及阳极氧化电压对TiO2纳米管阵列生长形貌的影响. 结果表明, 阳极氧化电压可以影响TiO2纳米管的径向尺寸和长度；通过改变电解液中DMSO/H2O的体积比, 能够调控纳米管的生成速率与形貌. 利用X射线衍射(XRD)对经过不同温度热处理的TiO2纳米管阵列薄膜的物相进行了分析. TiO2纳米管阵列薄膜的光电催化分解水过程的电压-电流特性测量显示, 光电流密度大于0.2 mA·cm-2.

Fabrication and Properties of TiO2 Nanotube Arrays Using Glycerol-DMSO-H2O Electrolyte

Anodization of titanium in a fluorinated glycerol, dimethyl sulfoxide (DMSO) and H2O electrolyte was investigated. The prepared anodic filmhad a highly ordered nanotube-array surface architecture with 0.4 to 1.5 μm tube length. Field emission scanning electron microscopy(FESEM) technique had been used to characterize the morphology of TiO2 nanotubes. The result showed that voltage and the volume ratio of DMSO to H2O were important factors to control the appearance and sizes of the TiO2 nanotube arrays. The average pore size increased with increasing anodizing voltage and decreasing the volume ratio of DMSO to H2O. And tube length increased with increasing anodizing voltage and the volume ratio of DMSO to H2O. A possible growth mechanism for the nanotubes formation had been proposed. X-ray diffraction (XRD) technique had been used to characterize the phase of TiO2 nanotubes. It was showed that the TiO2 structure depends on the heating condition. Amorphous phase was found at room temperature, the anatase phase was the predominant phase at 350 ℃, and with further heating to 550 ℃ the coexistence of rutile phase with anatase phase could be seen. Moreover the photoelectrochemical response of the nanotube-array photoeledtrode was studied using a 1 mol·L-1 KOH solution under UV illumination.