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Direct Synthesis of Silica Coated Gold (Au@SiO2) Core-shell Nanoparticles

Uma Pachauri1, Neha Arora1, Deepika P. Joshi1 and S. Ambwani2

1. Department of Physics, G.B.P.U.A & T, Pantnagar, India

2. Department of M.B.G.E, G.B.P.U.A & T, Pantnagar, India


Abstract: In this paper seeded polymerization technique has been used for the direct synthesis of silica coated gold (Au@SiO2) core-shell nanoparticles with study of their optical properties. No silane coupling agents were used for silica coating of gold nanoparticles. Gold nanoparticles were synthesized by using citrate reduction method and silica nanoparticles by Stӧber method. The morphological study reveals that the size of prepared gold, silica and Au@SiO2 nanoparticles are 40 nm, 200 nm and 245 nm respectively. The optical study shows that the absorption peak may control by core to shell ratio which can be helpful in various applications like photoacoustic study and targeted drug delivery system.

Key words: Core-shell nanoparticles, gold nanoparticles, UV-Vis spectroscopy.
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