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Growth Kinetics of Gold Nanocrystals: A Combined Small-Angle X-Ray Scattering and Calorimetric Study

Biswas, Kanishka and Varghes, Neenu and Rao, Chintamani NR (2008) Growth Kinetics of Gold Nanocrystals: A Combined Small-Angle X-Ray Scattering and Calorimetric Study. In: Small, 4 (5). pp. 649-655.

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Abstract

The growth of gold nanocrystals prepared by the reduction of tetrachloroauric acid by tetrakis(hydroxymethyl)phosphonium chloride, which allows slow reduction, is investigated by small-angle X-ray scattering and isothermal titration calorimetry in combination with transmission electron microscopy. The growth of the nanocrystals does not follow the diffusion-limited Ostwald ripening but instead follows a sigmoidal rate curve. The activation energy obtained from the temperature-dependent growth study is very small. The heat change associated with the growth is determined for the first time as approximately 10 kcal $mol^{-1}$ per 1 nm increase in the nanocrystals diameter

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Wiley Inter Science
Keywords: Growth kinetics, gold nanocrystals,calorimetry,sigmoidal growth,X-ray scattering
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 04 Jul 2008
Last Modified: 27 Aug 2008 13:32
URI: http://eprints.iisc.ernet.in/id/eprint/14764

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