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Room-temperature synthesis of gold nanoparticles - Size-control by slow addition

Sivaraman, Sankar K and Kumar, Sanjeev and Santhanam, Venugopal (2010) Room-temperature synthesis of gold nanoparticles - Size-control by slow addition. In: Gold Bulletin, 43 (4). pp. 275-286.

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We report a simple and rapid process for the room-temperature synthesis of gold nanoparticles using tannic acid, a green reagent, as both the reducing and stabilising agent. We systematically investigated the effect of pH on the size distribution of nanoparticles synthesized. Based on induction time and zeta- potential measurements, we show that particle size distribution is controlled by a fine balance between the rates of reduction (determined by the initial pH of reactants) and coalescence (determined by the pH of the reaction mixture) in the initial period of growth. This insight led to the optimal batch process for size-controlled synthesis of 2-10 nm gold nanoparticles - slow addition (within 10 minutes) of chloroauric acid into tannic acid.

Item Type: Journal Article
Publication: Gold Bulletin
Publisher: World Gold Council
Additional Information: Copyright of this article belongs to World Gold Council.
Keywords: gold nanoparticles; room-temperature; size-control; slow addition; tannic acid
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 21 Dec 2010 08:43
Last Modified: 21 Dec 2010 08:43
URI: http://eprints.iisc.ac.in/id/eprint/34577

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