Discrete dipole approximation analysis of plasmonic core/alloy nanoparticles

Wenjie Wu, Mathew M. Maye

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The surface plasmon resonance (SPR) properties of Au/AuxAg 1-x core/alloy nanoparticles (NPs) have been investigated by means of the discrete dipole approximation. The core/alloy microstructure was varied by changing the shell alloy composition x, its thickness tS, and the shell thickness to core radius ratio (tS/rC) in the range of 0.05-1.0. These changes resulted in a novel tuning of SPR shape, frequency, and extinction. These models were compared with experimental results for Au/AuxAg1-x NPs prepared by a microwave-mediated hydrothermal processing method, which produces core/alloy NPs with SPR signatures closely resembling those of the models. To the core: The surface plasmon resonance (SPR) of Au/AuxAg1-x core/alloy nanoparticles (NPs) has been studied by discrete dipole approximation (DDA; see figure). The SPRs were tunable by both alloy shell composition x and thickness tS. Through simulations of a series of core/alloy model NPs with x=0.2-0.8 and shell thickness to core radius ratio 0.05-1.0, the SPR features were compared with experimental measurements.

Original languageEnglish (US)
Pages (from-to)2582-2587
Number of pages6
JournalChemPhysChem
Volume15
Issue number12
DOIs
StatePublished - Aug 25 2014

Keywords

  • core/alloy structures
  • discrete dipole approximation
  • nanoparticles
  • structure elucidation
  • surface plasmon resonance

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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