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Dynamic spatial ordering of thin film nanostructures by rapid spatio-temporal surface modulations

Published online by Cambridge University Press:  01 February 2011

Wei Zhang ,
Chi Zhang  and
Ramki Kalyanaraman
Wei Zhang
Affiliation:
Department of Physics, Washington University in St. Louis, MO 63130
Chi Zhang
Affiliation:
Department of Physics, Washington University in St. Louis, MO 63130
Ramki Kalyanaraman
Affiliation:
Center for Materials Innovation, Washington University in St. Louis, MO 63130
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Abstract

We present novel results showing that the application of a rapid spatio-temporal surface modulation in-situ with film deposition directs the assembly of ordered nanostructures. Co nanoclusters of approximately 50 nm in size were assembled into one-dimensionally ordered arrays spaced 400 nm apart on Si (100) substrates during film growth of a 0.5 nm thick film. This ordered arrangement was achieved under e-beam evaporation of Co with simultaneous two-beam pulsed laser interference irradiation. The ordering length scale was consistent with the theoretical two-beam fringe spacing. For a thicker Co film, the particles were irregularly shaped, like that of a rapidly solidified liquid-like structure. From this evidence, the mechanism for ordering is partly attributed to thermal effects due to the spatially periodic laser interference heating of the cobalt nanoparticles. This dynamic in-situ process, without the need of any pre-or post-patterning of the substrate or film, is promising as an economical and simple approach to assemble ordered nanostructured films. The author can be reached via e-mail at [email protected]

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 849: Symposium KK – Kinetics-Driven Nanopatterning on Surfaces , 2004 , kk9.1
Copyright
Copyright © Materials Research Society 2005

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References

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