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Gamma-irradiation-induced Ag/SiO2 composite films and their optical absorption properties |
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| Authors: | A.L. Pan H.G. ZhengZ.P. Yang F.X. Liu Z.J. Ding Y.T. Qian |
| Affiliation: | a Structure Research Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, PR China b Department of Astronomy and Applied Physics, University of Science and Technology of China, Hefei, Anhui 230026, PR China c Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, PR China |
| Abstract: | Small Ag particles or clusters dispersed mesoporous SiO2 composite films were prepared by a new method: First the matrix SiO2 films were prepared by sol-gel process combined with the dip-coating technique, then they were soaked in AgNO3 solutions followed by irradiation of γ-ray at room temperature and in ambient pressure. The structures of these films were examined by X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM), and optical absorption spectroscopy. It has been shown that the Ag particles grown within the porous SiO2 films are very small, and they are isolated and dispersed from each other with very narrow size distributions. With increasing the soaking concentration and an additional annealing, an opposite peakshift effect of the surface plasmon resonance (SPR) was observed in the optical absorption measurements. |
| Keywords: | A. Composite A. Thin film B. Chemical synthesis D. Optical properties |
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