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Pulsed laser dewetting of Au films: Experiments and modeling of nanoscale behavior

Published online by Cambridge University Press:  14 May 2013

Sagar Yadavali ,
Mikhail Khenner  and
Ramki Kalyanaraman
Sagar Yadavali
Affiliation:
Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996
Mikhail Khenner
Affiliation:
Department of Mathematics, Western Kentucky University, Bowling Green, Kentucky 42101
Ramki Kalyanaraman*
Affiliation:
Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996; Department of Material Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996; andSustainable Energy Education and Research Center, University of Tennessee, Knoxville, Tennessee 37996
*
a)Address all correspondence to this author. e-mail: ramki@utk.edu
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Abstract

Ultrathin metal film dewetting continues to grow in interest as a simple means to make nanostructures with well-defined properties. Here, we explored the quantitative thickness-dependent dewetting behavior of Au films under nanosecond (ns) pulsed laser melting on glass substrates. The trend in particle spacing and diameter in the thickness range of 3–16 nm was consistent with predictions of the classical spinodal dewetting theory. The early stage dewetting morphology of Au changed from bicontinuous-type to hole-like at a thickness between 8.5 and 10 nm, and computational modeling of nonlinear dewetting dynamics also captured the bicontinuous morphology and its evolution quite well. The thermal gradient forces were found to be significantly weaker than dispersive forces in Au due to its large effective Hamaker coefficient. This also resulted in Au dewetting length scales being significantly smaller than those of other metals such as Ag and Co.

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Articles
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Journal of Materials Research , Volume 28 , Issue 13: FOCUS ISSUE: Frontiers in Thin-Film Epitaxy and Nanostructured Materials , 14 July 2013 , pp. 1715 - 1723
Copyright
Copyright © Materials Research Society 2013 

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