中国物理B ›› 2006, Vol. 15 ›› Issue (4): 859-865.doi: 10.1088/1009-1963/15/4/034

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Microstructure and optical absorption of Au--MgF2 nanoparticle cermet films

孙兆奇, 蔡琪, 宋学萍   

  1. School of Physics and Material Science, Anhui University, Hefei 230039, China
  • 收稿日期:2005-12-19 修回日期:2006-01-13 出版日期:2006-04-20 发布日期:2006-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 59972001), the Natural Science Foundation of Anhui Province, China (Grant No 01044901), the Talent Foundation of Anhui Province, China (Grant No 2004Z029), and the Talent Development Foundation of Anhui University,Anhui Province, China.

Microstructure and optical absorption of Au--MgF2 nanoparticle cermet films

Sun Zhao-Qi (孙兆奇), Cai Qi (蔡琪), Song Xue-Ping (宋学萍)   

  1. School of Physics and Material Science, Anhui University, Hefei 230039, China
  • Received:2005-12-19 Revised:2006-01-13 Online:2006-04-20 Published:2006-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 59972001), the Natural Science Foundation of Anhui Province, China (Grant No 01044901), the Talent Foundation of Anhui Province, China (Grant No 2004Z029), and the Talent Development Foundation of Anhui University,Anhui Province, China.

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摘要： The microstructure and optical absorption of Au--MgF2 nanoparticle cermet films with different Au contents are studied. The microstructural analysis shows that the films are mainly composed of the amorphous MgF2 matrix with embedded fcc Au nanoparticles with a mean size of 9.8--21.4nm. Spectral analysis suggests that the surface plasma resonance (SPR) absorption peak of Au particles appears at \lambda =492--537nm. With increasing Au content, absorption peak intensity increases, profile narrows and location redshifts. Theoretical absorption spectra are calculated based on Maxwell-Garnett theory and compared with experimental spectra.

关键词: nanoparticle cermet films, microstructure, optical absorption

Abstract: The microstructure and optical absorption of Au--MgF2 nanoparticle cermet films with different Au contents are studied. The microstructural analysis shows that the films are mainly composed of the amorphous MgF2 matrix with embedded fcc Au nanoparticles with a mean size of 9.8--21.4nm. Spectral analysis suggests that the surface plasma resonance (SPR) absorption peak of Au particles appears at $\lambda$ = 492--537nm. With increasing Au content, absorption peak intensity increases, profile narrows and location redshifts. Theoretical absorption spectra are calculated based on Maxwell-Garnett theory and compared with experimental spectra.

Key words: nanoparticle cermet films, microstructure, optical absorption

中图分类号:  (Thin film structure and morphology)

  • 68.55.-a
68.55.Nq (Composition and phase identification) 78.66.-w (Optical properties of specific thin films) 78.68.+m (Optical properties of surfaces)