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Chin. Phys., 2004, Vol. 13(11): 1854-1856    DOI: 10.1088/1009-1963/13/11/015

Enhanced Raman scattering from nano-SnO2 grains

Ding Shuo, Liu Jin-Quan, Liu Yu-Long
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract  We present the Raman spectra of nano-SnO_{2} grains with sizes from 4nm to 80nm excited by 532nm and 1.06μm lines. The enhanced Raman scattering of the nanograins is observed for both exciting lines when the grain size is less than 8nm. The less the grain size is, the more intensely the Raman scattering is enhanced. According to our results, the enhancements of the Raman intensity are a few tenfolds and different for different exciting lines when the grain size is 4nm. It can be attributed to enhanced Raman scattering by electron-hole pair excitations in the nanograins that originate from sub-microscopic (10nm) size and other defect- and surface-related features. A critical size that divides respective predominance of bulk properties and the defect-, surface-, and size-related features can be determined to be about 8nm.
Keywords:  nano-SnO_{2} grains      enhanced Raman scattering      electron-hole pair  
Received:  03 March 2004      Revised:  25 March 2004      Published:  20 June 2005
PACS:  78.30.Ly (Disordered solids)  
  61.46.-w (Structure of nanoscale materials)  
Fund: Project supported in part by Special Funds for Major State Basic Research of China (Grant No 2002CB713803).

Cite this article: 

Ding Shuo, Liu Jin-Quan, Liu Yu-Long Enhanced Raman scattering from nano-SnO2 grains 2004 Chin. Phys. 13 1854

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