期刊
NANOSCALE RESEARCH LETTERS
卷 6, 期 -, 页码 -出版社
SPRINGER
DOI: 10.1186/1556-276X-6-454
关键词
cubic SiC nanocrystals; surface charges; photoluminescence; quantum confinement
资金
- Key Laboratory of Functional Crystals and Laser Technology
- TIPC
- CAS
- National Natural Science Foundation [50932006, 50772116, 60807008]
- Shanghai Rising-Star Program [10QA1403500]
- Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP [200802481028]
- SMC Excellent Young Faculty Project of ChenXing Scholar Prize Program [SMC2009GB16]
Colloidal cubic silicon carbide (SiC) nanocrystals with an average diameter of 4.4 nm have been fabricated by anisotropic wet chemical etching of microsized cubic SiC powder. Fourier transform infrared spectra show that these cubic SiC nanocrystals contain carboxylic acid, SiH, CH, and CH(x) groups. UV/Vis absorption and photoluminescence (PL) spectroscopy clearly indicate that water and ethanol colloidal suspensions of the as-fabricated colloidal samples exhibit strong and above band gap blue and blue-green emissions. The cubic SiC nanocrystals show different surface charges in water and ethanol solutions due to the interaction of water molecules with polar Si-terminated surfaces of cubic SiC nanocrystals. The results explain the distinctive optical characteristics of colloidal cubic SiC nanocrystals in water and ethanol, and reveal that quantum confinement and surface charges play a great role in determining the optical characteristics of colloidal cubic SiC nanocrystals.
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