Formation of two-dimensional structures by tuning the driving force of chemical reactions: An interpretation of kinetic control

Viswanath, B and Kundu, Paromita and Ravishankar, N (2009) Formation of two-dimensional structures by tuning the driving force of chemical reactions: An interpretation of kinetic control. In: Journal of Colloid and Interface Science, 330 (1). pp. 211-219.

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Abstract

Understanding shape control during wet chemical synthesis is important for rational synthesis of nanostructures. Here, we show that two-dimensional metal structures can be obtained from metal salts by reducing the driving force of the reduction reaction that directly translates to the growth of the metal taking place by the two-dimensional nucleation (layer-by-layer growth) mechanism. Experimental evidence is provided for Au, Ag, Pt and Pd systems by choosing appropriate reaction conditions without using any external surfactant. The results are analyzed in terms of the calculations of driving force under different conditions. The results show that surfactants may not be important for producing shape control for the case of 2-D structures while they are required to obtain size control. It is shown that the regime of low driving force is also one where the kinetics of the process is slow and thus a new interpretation of the kinetic control hypothesis is provided.

Item Type:	Journal Article
Publication:	Journal of Colloid and Interface Science
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Wet chemical synthesis;Two-dimensional nanostructures; Driving force;Layer-by-layer growth;Kinetic control.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	11 Sep 2009 10:14
Last Modified:	19 Sep 2010 05:24
URI:	http://eprints.iisc.ac.in/id/eprint/18597

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