Nano Archive

Coerced mechanical coarsening of nanoparticle assemblies

Blunt, Matthew O. and Martin, C. P. and Ahola-Tuomi, M and Pauliac-Vaujour, E and Sharp, P and Nativo, P and Brust, M and Moriarty, P. J. (2007) Coerced mechanical coarsening of nanoparticle assemblies. NATURE NANOTECHNOLOGY, 2 (3). pp. 167-170.

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Official URL: http://www.nature.com/nnano/journal/v2/n3/abs/nnan...

Abstract

Coarsening is a ubiquitous phenomenon(1-3) that underpins countless processes in nature, including epitaxial growth(1,3,4), the phase separation of alloys, polymers and binary fluids(2), the growth of bubbles in foams(5), and pattern formation in biomembranes(6). Here we show, in the first real-time experimental study of the evolution of an adsorbed colloidal nanoparticle array, that tapping-mode atomic force microscopy (TM-AFM) can drive the coarsening of Au nanoparticle assemblies on silicon surfaces. Although the growth exponent has a strong dependence on the initial sample morphology, our observations are largely consistent with modified Ostwald ripening processes(7-9). To date, ripening processes have been exclusively considered to be thermally activated, but we show that nanoparticle assemblies can be mechanically coerced towards equilibrium, representing a new approach to directed coarsening. This strategy enables precise control over the evolution of micro- and nanostructures.

Item Type:Article
Subjects:Analytical Science > Microscopy and probe methods
Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:2685
Deposited By:Anuj Seth
Deposited On:06 Jan 2009 17:33
Last Modified:13 Feb 2009 08:58

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