二氧化鈦奈米柱光觸媒之合成及其半導體性質之光電化學分析

TiO2 Nanorod Preparation and Its Characterization Using Photoelectrochemical Method

粘駿楠(Jun-Nan Nian) ； 鄧熙聖(Hsi-Sheng Teng)

《界面科學會誌》 26卷4期 (2004/12) Pp. 183-190

https://doi.org/10.30020/JCCIS.200412.0002

摘要

TiO2有良好之化學穩定性及反應性，為目前最常被研究之半導體光觸媒，其結構可因合成條件的變化而改變。本研究介紹新穎的TiO2奈米柱合成法，使用TiO2 粉末（P25）為起始物，以10M NaOH 化學處理將P25結晶相溶解成非結晶之水合物，再經由水熱法製得一維奈米柱結構。所得之奈米柱經由XRD光譜分析顯示為純銳鈦礦相。為研究其在水溶液下的半導體界面性質，本研究利用交流阻抗光譜搭配光源照射，分析TiO2奈米柱之光能催化水分解之特性，並求出半導體空間電荷層之電位差和電容，以獲得所製成TiO2奈米柱之平帶電位及摻雜濃度， 且進一步求出其導帶和價帶能位。本文所述技術可應用於鑑定各類光觸媒的半導體性質。

關鍵字

二氧化錢 ； 奈米柱 ； 光觸媒 ； 水分解 ； 光化學電極

並列摘要

TiO2, a wide band gap semiconductor, can generate powerful oxidizing holes and reducing electrons by absorbing photon energies. Because of this feature and its durability, TiO2 has been extensively studied for applications as photocatalysts. The structure of TiO2 can be regulated by using different preparation processes. In the present work, TiO2 nanorods were prepared by treating a commercial-grade TiO2 powder in 10 N NaOH, followed by hydrothermal treatment in water. X-ray diffraction analysis showed that the nanorods were phase-pure anatase. Photoelectrochemical method was used to characterize the prepared TiO2. Under illumination of incident light of different wavelengths, the semiconductor characteristics of the TiO2 were obtained with the assistance of a.c. impedance. The developed photoelectrochemical technique can also be applied for characterization of other photocatalysts.

並列關鍵字

Titania ； Nanorod ； Photocatalyst ； Water-Splitting ； Photoelectrochemical Electrode