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The optical properties of Cu-Ni nanoparticles produced via pulsed laser dewetting of ultrathin films: The effect of nanoparticle size and composition on the plasmon response

Published online by Cambridge University Press:  01 January 2011

Y. Wu ,
J.D. Fowlkes  and
P.D. Rack
Y. Wu
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
J.D. Fowlkes
Affiliation:
Center for Nanophase Materials Sciences Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
P.D. Rack*
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996; and Center for Nanophase Materials Sciences Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Thin film Cu-Ni alloys ranging from 2–8 nm were synthesized and their optical properties were measured as-deposited and after a laser treatment which dewet the films into arrays of spatially correlated nanoparticles. The resultant nanoparticle size and spacing are attributed to a laser induced spinodal dewetting process. The evolution of the spinodal dewetting process is investigated as a function of the thin film composition which ultimately dictates the size distribution and spacing of the nanoparticles. The optical measurements of the copper rich alloy nanoparticles reveal a signature absorption peak suggestive of a plasmon peak that red-shifts with increasing nanoparticle size and blue-shifts and dampens with increasing nickel concentration.

Type
Reviews
Information
Journal of Materials Research , Volume 26 , Issue 2: Focus Issue: Self-Assembly and Directed Assembly of Advanced Materials , 28 January 2011 , pp. 277 - 287
Copyright
Copyright © Materials Research Society 2011

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