De, Goutam and Kundu, Debtosh (2001) Silver-nanocluster-doped inorganic-organic hybrid coatings on polycarbonate substrates Author(s): De G; Kundu D 288 Issue: 1-3 Pages: 221-225 DOI: 10.1016/S0022-3093(01)00605-6 Published: AUG 2001. Journal of Non-Crystalline Solids, 288 (1-3). 221 -225. ISSN 0022-3093

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Ag-nanocluster doped inorganic-organic hybrid coatings were prepared on polycarbonate (PC) substrates. The sol was prepared by incorporating AgNO3 in a composite inorganic-organic hybrid sol derived from 3-(glycidoxypropyl)trimethoxy silane (GLYMO)-tetraethyl orthosilicate-3-(methacryloxypropyl)-trimethoxy silane (MEMO). The hydrolysis-condensation of alkoxy groups and polymerization of epoxy and methacrylate groups formed the composite matrix network. The coating compositions with respect to the equivalent silver metal and silica were 1 mol% Ag-99% SiO2 and 5 mol% Ag-95% SiO2. Thermal annealing (100 degreesC) of former coatings (1 Ag) showed no precipitation of Ag-nanoclusters whereas the latter one (5 Ag) showed Ag precipitation. As a result 5 Ag films showed the characteristic absorption at 412 nm due to the surface plasmon resonance (SPR) of Ag-nanoclusters. When these coated PCs were exposed to UV light, polymerization of the methacrylate groups, strengthening of the silica network, along with formation of Ag-nanoclusters occurred simultaneously. The UV curing induced generation of Ag-nanoclusters in I Ag films whereas coarsening of Ag-nanoclusters resulted in the case of 5 Ag films.

Item Type: Article
Depositing User: Mrs Chandana Patra
Date Deposited: 13 Feb 2012 12:19
Last Modified: 13 Feb 2012 12:19

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