Viswanath, B and Kundu, Paromita and HaIder, Adid and Ravishankar, N (2009) Mechanistic Aspects of Shape Selection and Symmetry Breaking during Nanostructure Growth by Wet Chemical Methods. In: Journal of Physical Chemistry C, 113 (39). pp. 16866-16883.
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The control of shapes of nanocrystals is crucial for using them as building blocks for various applications. In this paper, we present a critical overview of the issues involved in shape-controlled synthesis of nanostructures. In particular, we focus on the mechanisms by which anisotropic structures of high-symmetry materials (fcc crystals, for instance) could be realized. Such structures require a symmetry-breaking mechanism to be operative that typically leads to selection of one of the facets/directions for growth over all the other symmetry-equivalent crystallographic facets. We show how this selection could arise for the growth of one-dimensional structures leading to ultrafine metal nanowires and for the case of two-dimensional nanostructures where the layer-by-layer growth takes place at low driving forces leading to plate-shaped structures. We illustrate morphology diagrams to predict the formation of two-dimensional structures during wet chemical synthesis. We show the generality of the method by extending it to predict the growth of plate-shaped inorganics produced by a precipitation reaction. Finally, we present the growth of crystals under high driving forces that can lead to the formation of porous structures with large surface areas.
|Item Type:||Journal Article|
|Additional Information:||Copy right of this article belongs to American Chemical Society.|
|Department/Centre:||Division of Chemical Sciences > Materials Research Centre|
|Date Deposited:||16 Dec 2009 10:36|
|Last Modified:||19 Sep 2010 05:47|
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