Nanopatterning by solid-state dewetting on reconstructed ceramic surfaces

Basu, Joysurya and Carter, Barry C and Divakar, R and Mukherjee, B and Ravishankar, N (2009) Nanopatterning by solid-state dewetting on reconstructed ceramic surfaces. In: Applied physics letters, 94 (17).

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Abstract

We demonstrate ordered array formation of Au nanoparticles by controlled solid-state dewetting of a metal film on stepped alumina substrates. In situ transmission electron microscopy studies reveal that the dewetting process starts with nucleation of ordered dry regions on the substrate. The chemical potential difference between concave and convex surface regions induces anisotropic metal diffusion leading to the formation of nanowires in the valleys. The nanowires fragment due to Rayleigh instability forming arrays of metal nanoparticles on the substrate. The length scale of reconstruction relative to the starting film thickness is an important parameter in controlling the spatial order of the nanoparticles.

Item Type:	Journal Article
Publication:	Applied physics letters
Publisher:	Amer inst physics
Additional Information:	Copy right of this article belongs to American institute physics.
Keywords:	Ceramics; Chemical Potential; Diffusion; Gold; Metallic Thin Films; Nanoparticles; Nanopatterning; Nanowires; Nucleation; Surface Reconstruction; Transmission Electron Microscopy; Wetting
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	11 Dec 2009 08:58
Last Modified:	01 Mar 2019 05:37
URI:	http://eprints.iisc.ac.in/id/eprint/20572

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