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[email protected]2 (M= Ti, Zr, Si) Films by Ex Situ Incorporation Approach

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Au NPs (average diameter ∼20 nm) incorporated MO2 (M = Ti, Zr and Si) films on glass substrate were synthesized using an ex situ approach. Au NPs were first synthesized and then incorporated into the respective alkoxide derived sols with control of pH. The Au plasmon band was red-shifted in cases of [email protected]2 and [email protected]2 films after annealing at 300 and 500 C mainly due to the increase of refractive index (RI) with matrix crystallizations. [email protected]2 film showed decrease in RI after annealing, and consequently the Au plasmon was blue-shifted. All heat-treated films appeared spot-free, optically homogeneous and colorful. The surface hardness of heat-treated [email protected]2 and [email protected]2 films were > 2H and 4H, respectively. The heat-treated [email protected]2 and [email protected]2 films showed strong anatase TiO2 and cubic ZrO2 crystalline phases, respectively whereas in case of [email protected]2, silica remained amorphous and porous.
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Keywords: AU NANOPARTICLES; [email protected] FILMS; [email protected]; [email protected]; SOL–GEL

Document Type: Research Article

Publication date: 01 May 2012

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