| Microstructure and Raman spectra of Ag-MgF_2 cermet films |
| |
| 作者姓名： | 史守华 曹卓良 孙兆奇 |
| |
| 作者单位： | Department of Physics，Anhui University，Hefei 230039，Department of Physics，Anhui University，Hefei 230039，Department of Physics，Anhui University，Hefei 230039 |
| |
| 基金项目： | This work was supported by the National Natural Science Foundation of China under Grant No. 59972001 and the Natural Science Foundation of Anhui Province under Grant No. 01044901. |
| |
| 摘 要： | Ag-MgF2 cermet films with different Ag fractions were prepared by vacuum evaporation. The micfostruc-ture of the films was examined by Raman scattering technique. The surface-enhanced Raman spectrum for MgF2 molecules in the cermet film strongly suggests the existence of Ag nanoparticles dispersed in MgFa matrix. The intensities of the Raman spectra of Ag-MgF2 cermet films increase with Ag fraction. The enhancement of Raman scattering disappears when Ag content reaches wt.20%. The analyses with the transmission electron microscopy showed that Ag-MgF2 cermet films are mainly composed of amorphous MgF2 matrix with embedded faced-center-cubic Ag nanoparticles. It suggests that the percolation threshold should be around wt.20% of Ag content.
|
Microstructure and Raman spectra of Ag-MgF2 cermet films |
| |
| Abstract: | Ag-MgF2 cermet films with different Ag fractions were prepared by vacuum evaporation. The microstruc-ture of the films was examined by Raman scattering technique. The surface-enhanced Raman spectrumfor MgF2 molecules in the cermet film strongly suggests the existence of Ag nanoparticles dispersed inMgF2 matrix. The intensities of the Raman spectra of Ag-MgF2 cermet films increase with Ag fraction.The enhancement of Raman scattering disappears when Ag content reaches wt.20%. The analyses withthe transmission electron microscopy showed that Ag-MgF2 cermet films are mainly composed of amor-phous MgF2 matrix with embedded faced-center-cubic Ag nanoparticles. It suggests that the percolationthreshold should be around wt.20% of Ag content. |
| |
| Keywords: | |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
