Surface charges and optical characteristic of colloidal cubic SiC nanocrystals

被引：71
作者：
Li, Yong [2 ,3 ]
Chen, Changxin [1 ]
Li, Jiang-Tao [2 ]
Yang, Yun [2 ]
Lin, Zhi-Ming [2 ]
机构：
[1] Shanghai Jiao Tong Univ, Natl Key Lab Nano Micro Fabricat Technol, Key Lab Thin Film & Microfabricat, Minist Educ,Res Inst Micro Nano Sci & Technol, Shanghai 200240, Peoples R China
[2] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China
[3] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
来源：
NANOSCALE RESEARCH LETTERS | 2011年 / 6卷
关键词：
cubic SiC nanocrystals; surface charges; photoluminescence; quantum confinement; SILICON-CARBIDE; STACKING-FAULTS; POROUS SILICON; NANOSTRUCTURES; LUMINESCENCE; SPECTROSCOPY; OXIDATION; EMISSION; POWDERS;
D O I：
10.1186/1556-276X-6-454
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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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页码：1 / 7
页数：7
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