中国物理B ›› 2004, Vol. 13 ›› Issue (11): 1854-1856.doi: 10.1088/1009-1963/13/11/015

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Enhanced Raman scattering from nano-SnO2 grains

丁硕, 刘金全, 刘玉龙   

  1. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2004-03-03 修回日期:2004-03-25 出版日期:2004-11-20 发布日期:2005-06-20
  • 基金资助:
    Project supported in part by Special Funds for Major State Basic Research of China (Grant No 2002CB713803).

Enhanced Raman scattering from nano-SnO2 grains

Ding Shuo (丁硕), Liu Jin-Quan (刘金全), Liu Yu-Long (刘玉龙)   

  1. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2004-03-03 Revised:2004-03-25 Online:2004-11-20 Published:2005-06-20
  • Supported by:
    Project supported in part by Special Funds for Major State Basic Research of China (Grant No 2002CB713803).

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摘要： 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.

关键词: nano-SnO_{2} grains, enhanced Raman scattering, electron-hole pair

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.

Key words: nano-SnO$_{2}$ grains, enhanced Raman scattering, electron-hole pair

中图分类号:  (Disordered solids)

  • 78.30.Ly
61.46.-w (Structure of nanoscale materials)