期刊
NANO RESEARCH
卷 5, 期 3, 页码 213-221出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-012-0201-x
关键词
Photocatalysis; nanosheet; nanomaterial; La2Ti2O7; hydrothermal processing
类别
资金
- National Science Foundation (NSF) [CBET-1033266]
- Research Challenge Grant of West Virginia State [EPS08-01]
- NSF RII [EPS 1003907]
- West Virginia University Research Corporation
- West Virginia EPSCoR Office
- State Key Laboratory of Silicon Materials at Zhejiang University, China [SKL2009-14]
- Direct For Mathematical & Physical Scien [1004431] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1033266] Funding Source: National Science Foundation
- Division Of Materials Research [1004431] Funding Source: National Science Foundation
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 A degrees C. Doping nitrogen into the La2Ti2O7 nanosheets results in the narrowing of the band gap, extending the light absorption into the visible light region (similar to 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.
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