自供能TiO2纳米管紫外探测器的制备与性能研究

采用液相沉积法在ITO衬底上以ZnO纳米棒阵列为模板合成了TiO₂纳米管阵列，并采用SEM、XRD对样品的形貌、结构等进行表征。在此基础上，以空白ITO导电玻璃为对电极制备了光电化学型紫外探测器，并对其光响应特性进行测试。实验结果表明，制得的TiO₂纳米管轻微弯曲，由单一稳定的锐钛矿相组成。制得的自供能TiO₂纳米管紫外探测器对300~400 nm紫外波段非常敏感而对可见光区无响应。在无外加偏压的条件下，TiO₂纳米管紫外探测器能够对紫外光实现探测，表现出自供能特性并且具有较高的光敏性。循环测试结果表明，制得的自供能TiO₂纳米管紫外探测器能够循环工作且性能稳定，上升时间和下降时间分别为0.33 s和0.38 s。

Fabrication and Properties of Self-powered Ultraviolet Detector Based on TiO2 Nanotubes

TiO₂ nanotubes arrays were fabricated on ITO substrate via a liquid phase deposition method, with the assistance of ZnO nanorods arrays template, and the morphologies and structures of the samples were characterized by using SEM and XRD. Furthermore, the photoelectrochemical photodetector was fabricated with ITO as counter electrode and the photocurrent and spectral responses were measured. In addition to the high sensitivity and self-powered characteristic, the photodetector also revealed a splendid wavelength selectivity in the spectral range between 300 and 400 nm at zero bias voltage. Meanwhile, it is interesting to note that self-powered TiO₂ nanotubes UV-photodetector has the excellent stability and repeatability, and the rise time and decay time are 0.33 s and 0.38 s, respectively.