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Bimetallic plasmonic nanoparticles enable tuning of the optical response andchemical stability by variation of the composition. The present numericalsimulation study compares Ag-Au alloy, Ag@Au core-shell, and Au@Ag core-shellbimetallic plasmonic nanoparticles of both spherical and anisotropic(nanotriangle and nanorods) shapes. By studying both spherical and anisotropic(with LSPR in the near-infrared region) shapes, cases with and withoutinterband transitions of Au can be decoupled. Explicit comparisons arefacilitated by numerical models supported by careful validation and examinationof optical constants of Au-Ag alloys reported in literature. Although bothAu-Ag core-shell and alloy nanoparticles exhibit an intermediary opticalresponse between that of pure Ag and Au nanoparticles, there are noticeabledifferences in the spectral characteristics. Also, the effect of the bimetallicconstitution in anisotropic nanoparticles is starkly different from that inspherical nanoparticles due to the absence of Au interband transitions in theformer case. In general, the improved chemical stability of Ag nanoparticles byincorporation of Au comes with a cost of reduction in plasmonic enhancement,also applicable to anisotropic nanoparticles with a weaker effect. Aphotothermal heat transfer study confirms that increased absorption by theincorporation of Au in spherical Ag nanoparticles also results in an increasedsteady state temperature. On the other hand, anisotropic nanoparticles areinherently better absorbers, hence better photothermal sources and theirphotothermal properties are apparently not strongly affected by theincorporation of one metal in the other.

Silver-Gold Bimetallic Alloy versus Core-Shell Nanoparticles: Implications for Plasmonic Enhancement and Photothermal Applications