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.
- core/alloy structures
- discrete dipole approximation
- structure elucidation
- surface plasmon resonance
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry