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Ag颗粒形貌对 Ag-SiO2复合薄膜表面共振吸收特性的影响

赵亚丽1,2, 许小亮1,2, 明海2   

  1. 1. 中国科学院结构分析重点实验室, 合肥 230026; 2. 中国科学技术大学物理系, 合肥 230026
  • 收稿日期:2007-03-22 修回日期:2007-05-11 出版日期:2008-03-20 网络出版日期:2008-03-20

Effects of Ag Particles’ Shape in Ag-SiO2 Composite Films on Surface Resonance Absorption Properties

ZHAO Ya-Li1,2, XU Xiao-Liang1,2, MING Hai2   

  1. 1. Structure Research Laboratory, Chinese Academy of Sciences, Hefei 230026, China; 2. Department Physics, University of Science and technology of China, Hefei 230026, China
  • Received:2007-03-22 Revised:2007-05-11 Published:2008-03-20 Online:2008-03-20

摘要: 利用磁控溅射制备了Ag和SiO2分层结构, 通过快速热处理, 使Ag颗粒扩散到复合薄膜的表面附近. 在实验中, 通过改变每层Ag和SiO2的厚度, 制备出不同形貌的Ag纳米颗粒. 分析了Ag颗粒的形貌对其费米能级的影响. 发现Ag颗粒的曲率越大, 颗粒层间的台阶越宽, 颗粒费米能级上的电子数目越多, 共振吸收相应地增强.

关键词: 共振吸收, 表面电子态, 表面能级, 费米能级

Abstract: Ag/SiO2 multilayer thin films were prepared by RF magnetron sputtering. The Ag nanoparticles diffuse towards and mostly assemble near the surface of the Ag-SiO2 films via rapid thermal treatment. Ag nanoparticles with different shapes can be obtained by changing the thickness of Ag and SiO2 layers. It is found that the Ag particles with sharper edges and wider terrace between steps have more electrons at Fermi level. Accordingly, the intensity of resonance absorption is obviously enhanced.

Key words: resonance absorption, surface state, energy of surface state, Fermi leve

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