Synthesis of Cu/SiO2 composite films via gamma-irradiation route and their optical absorption properties |
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| Authors: | Xiaojun Zhang Dongen Zhang Xiaomin Ni Jing Chen Huagui Zheng |
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| Affiliation: | 1. School of Physical Science and Technology, Southwest University, Chongqing 400715, People''s Republic of China;2. Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, People''s Republic of China;1. Department of Materials Science, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation;2. Institute of Physical Materials Science, Siberian Branch of the Russian Academy of Sciences, 670047 Ulan-Ude, Russian Federation;3. N. N. Blokhin Russian Cancer Research Center, 115478 Moscow, Russian Federation;4. Department of Biology, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation;5. Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation |
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| Abstract: | The Cu 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, and then they were soaked in Cu(NO3)2 solutions followed by γ-ray irradiation at room temperature and in ambient pressure. Thus, the prepared Cu/SiO2 composite films were examined by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy and optical absorption spectroscopy. It has been shown that the Cu 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 the Cu particles size changing, an interesting peak shift was observed in the optical absorption measurement. Possible mechanisms of this behavior are discussed in this paper. |
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