期刊
MATERIALS RESEARCH BULLETIN
卷 47, 期 5, 页码 1119-1122出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2012.02.016
关键词
Nanostructures; Crystal growth; Electron microscopy; optical properties
资金
- National Basic Research Program of China (973 Program) [2010CB934500, 2012CB825800]
- National Natural Science Foundation of China (NSFC) [51132006, 21073127, 21071104, 91027041]
- Foundation for the Author of National Excellent Doctoral Dissertation of P R China (FANEDD) [200929]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [11KJB150015]
The surface of hydrogen-terminated silicon nanowires was proved to be photo-active and redox-controllable under a visible light by the color alteration of methylene blue: colorless in dark and blue in light in the presence of H-SiNWs. The process of the redox reaction was monitored by a UV-vis spectrophotometry, showing a repeatable interconversion between methylene blue and lueco methylene blue within 2 h under conditions of alternant dark and light environments. During the redox process, oxygen was proved necessary for the reversible color alteration of methylene blue. The high repeatability in dark-reduction and photo-oxidation of methylene blue demonstrates the catalytic activity of ultrafine hydrogen-terminated silicon nanowires. Finally, a possible mechanism is deduced. (C) 2012 Elsevier Ltd. All rights reserved.
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