Fabrication of a TiO2/carbon nanowall heterojunction and its photocatalytic ability

被引：106

作者：

Wang, Hua ^{[1
]}

Quan, Xie ^{[1
]}

Yu, Hongtao ^{[1
]}

Chen, Shuo ^{[1
]}

机构：

[1] Dalian Univ Technol, Sch Environm & Biol Sci & Technol, Minist Educ, Key Lab Ind Ecol & Environm Engn, Dalian 116024, Peoples R China

来源：

CARBON | 2008年 / 46卷 / 08期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

D O I：

10.1016/j.carbon.2008.04.016

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A two-dimensional TiO2/carbon nanowall composite material was fabricated by growing carbon nanowalls on a Ti sheet with hot filament chemical vapor deposition, followed by metal-organic chemical vapor deposition using titanium isopropoxide as TiO2 precursor and argon as carrier gas. Scanning electron microscopy showed that TiO2 was uniformly coated on the entire carbon nanowall and a TiO2/carbon nanowall composite was obtained. Raman spectroscopy and X-ray diffraction indicated that the crystal phase of the TiO2 coating was anatase. The asymmetry of the current-voltage plot for the material revealed that a heterojunction was formed between the TiO2 and the carbon nanowall. As a result of this heterojunction, enhanced separation of photogenerated electrons and holes was confirmed by surface photovoltage and photocurrent measurements. The investigation of photocatalytic ability showed that the TiO2/carbon nanowall had a higher photocatalytic activity than TiO2 nanotubes for the degradation of phenol under UV light irradiation. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1126 / 1132

页数：7

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