Visible light photocatalytic activity of nitrogen-doped La2Ti2O7 nanosheets originating from band gap narrowing

被引：0
作者：
Fanke Meng
Zhanglian Hong
James Arndt
Ming Li
Mingjia Zhi
Feng Yang
Nianqiang Wu
机构：
[1] West Virginia University,Department of Mechanical and Aerospace Engineering, WVNano Initiative
[2] Zhejiang University,State Key Laboratory of Silicon Materials, Department of Materials Science & Engineering
[3] West Virginia University,Department of Chemistry
[4] West Virginia University,Department of Industrial and Management Systems Engineering
来源：
Nano Research | 2012年 / 5卷
关键词：
Photocatalysis; nanosheet; nanomaterial; La; Ti; O; hydrothermal processing;
D O I：
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摘要：
Approximately 15 nm thick nitrogen-doped lanthanum titanate (La2Ti2O7) nanosheets with a single-crystalline perovskite structure have been prepared by hydrothermal processing and subsequent heat treatment in NH3 at 600 °C. Doping nitrogen into the La2Ti2O7 nanosheets results in the narrowing of the band gap, extending the light absorption into the visible light region (∼495 nm). The nitrogen-doped La2Ti2O7 nanosheets not only show significant visible light photocatalytic activity toward the decomposition of methyl orange but also exhibit enhanced the ultraviolet light photocatalytic activity. The enhancement of photocatalytic activity originates from the narrowing of the band gap of La2Ti2O7 nanosheets. The results obtained show that the desirable route to extend the photocatalytic activity of a semiconductor from the ultraviolet to the visible light region is to narrow the band gap rather than to create localized mid-gap states. [inline-graphic not available: see fulltext]
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页码：213 / 221
页数：8
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