二氧化钛纳米管中的光诱导电荷分离

Photoinduced charge separation in titania nanotubes.

作者信息

Tachikawa Takashi, Tojo Sachiko, Fujitsuka Mamoru, Sekino Toru, Majima Tetsuro

机构信息

The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan.

出版信息

J Phys Chem B. 2006 Jul 27;110(29):14055-9. doi: 10.1021/jp063800q.

DOI:10.1021/jp063800q

PMID:16854100

Abstract

The photocatalytic one-electron oxidation reaction of an aromatic compound during UV light irradiation of titania nanotubes and nanoparticles was investigated using time-resolved diffuse reflectance spectroscopy. Remarkably long-lived radical cations of the aromatic compound and trapped electrons were observed for the nanotubes when compared to those for nanoparticles. The influences of the morphology on the one-electron oxidation process of an aromatic compound adsorbed on the surface were discussed in terms of the charge recombination dynamics between the radical cation and electrons in TiO2.

摘要

利用时间分辨漫反射光谱研究了在二氧化钛纳米管和纳米颗粒的紫外光照射过程中芳香族化合物的光催化单电子氧化反应。与纳米颗粒相比，在纳米管中观察到了芳香族化合物显著长寿命的自由基阳离子和捕获电子。从TiO₂中自由基阳离子与电子之间的电荷复合动力学角度讨论了形态对吸附在表面的芳香族化合物单电子氧化过程的影响。