Enhanced photochemical response of TiO2/CdSe heterostructured nanowires

被引：57

作者：

Lee, Jung-Chul

Kim, Tae Geun

Choi, Heon-Jin

Sung, Yun-Mo ^{[1
]}

机构：

[1] Korea Univ, Dept Mat Sci & Engn, Seoul 136713, South Korea

[2] Korea Univ, Dept Elect Engn, Seoul 136713, South Korea

[3] Yonsei Univ, Sch Adv Mat Sci & Engn, Seoul 120749, South Korea

来源：

CRYSTAL GROWTH & DESIGN | 2007年 / 7卷 / 12期

关键词：

D O I：

10.1021/cg070588m

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

High-density single-crystalline TiO2 nanowires (similar to 50 nm diam) were successfully grown on Ti substrates by chemical vapor deposition at a low temperature of 700 degrees C and within a remarkably short time period of 5 min. They were combined with CdSe nanocrystals (similar to 5 nm diam) to form TiO2/CdSe heterotructured nanowires by overcoating the nanowires with the CdSe-containing solution and subsequent annealing at 600 degrees C. The TiO2/CdSe nanowires showed uniformly distributed CdSe nanocrystals, and high crystallinity of rutile and wurtzite from the TiO2 and the CdSe, respectively. Owing to the heterostructure of the TiO2/CdSe, they demonstrate almost full visible-range light absorption and thus enhanced photocatalytic activity by charge separation via electron and hole transfer between the CdSe and the TiO2.

引用

页码：2588 / 2593

页数：6

共 39 条

[1] Highly efficient dye-sensitized solar cells with a titania thin-film electrode composed of a network structure of single-crystal-like TiO2 nanowires made by the "oriented attachment" mechanism [J].