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9 February 2005 Optical spectroscopy of Ag-SiO2 nanocomposite coatings
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In present work, Ag-SiO2 nano-composite coatings with Ag/Si=0.01~0.10(atom ratio) on soda-lime-silicate glasses have been prepared by sol-gel method. The optical absorption (OA) and photoluminescence (PL) spectroscopy of the coatings have been studied. The photoluminescence properties and mechanisms of samples, excited with 228nm and 325nm, have been discussed. The results indicate that the photoluminescence mostly associate with silver, which are in different chemical states. Excited with 228nm, the emission bands centered at about 365nm and 460nm originate from the electron transitions of 1D21S0 and 3D→1S0 in Ag+ respectively. Excited with 325nm, the emissions bands of 350~500nm and 640~690nm due to the silver clusters (Ag2+, Ag3+, etc.) and silver nanoparticles respectively. The presence of the silver nanoparticles gives a yellow color to the coatings, which show the well-know absorption band at about 400nm results from surface plasmon resonance. The XPS and TEM results show that the heat-treatment temperature, the Ag/Si ratio can influence chemical states of silver and can regulate the size, amount and distribution of silver nanaparticles in the matrix, then influence the optical properties.
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Qiantao Li, Changxin Xiong, He Feng, and Zhaoyan Zhang "Optical spectroscopy of Ag-SiO2 nanocomposite coatings", Proc. SPIE 5635, Nanophotonics, Nanostructure, and Nanometrology, (9 February 2005);

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