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Open Access Nano Express

Surface plasmon resonance of Au-Cu bimetallic nanoparticles predicted by a quasi-chemical model

Yen-Hsun Su12* and Wen-Lin Wang1

Author Affiliations

1 Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan

2 Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan

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Nanoscale Research Letters 2013, 8:408  doi:10.1186/1556-276X-8-408

Published: 2 October 2013

Abstract

Au-Cu alloys are functional materials with nonlinear optical applications. However, the optical properties of such alloys are difficult to predict due to the random mixing of materials. In this paper, we present a quasi-chemical model to simulate the optical properties of Au-Cu alloy systems based on the mixing of Gibbs free energy. This model is also able to predict the position of the surface plasmon resonance peaks for Au-Cu alloy nanoparticles. The model can be applied to predict the optical properties of alloy systems in the fields of plasmonics and nanophotonics.

Keywords:
Dielectric properties; Gibbs free energy; Nanostructures; Metals; Optical properties