Journal of Materials Research

Reviews

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

Y. Wua1, J.D. Fowlkesa2 and P.D. Racka3 c1

a1 Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996

a2 Center for Nanophase Materials Sciences Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

a3 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

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.

(Received April 26 2010)

(Accepted August 06 2010)

(Online publication January 01 2011)

Correspondence:

c1 Address all correspondence to this author. e-mail: prack@utk.edu

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