New anisotropic bimetallic nanoparticles are prepared on the surface of a substrate with different structures. Unlike the homogenous deposition of Pt on the surface of colloidal gold nanorods (AuNRs), Pt ions are chemically reduced and deposit on the surface of organized AuNRs 2-D arrays bound to a substrate inhomogeneously. Pt atoms deposit initially at the tips of the AuNRs with a slow rate, which increases over time. After a complete coverage of the tips, the deposition proceeds on the side of the AuNR 2-D arrays. The mechanism of breaking the symmetry of the deposition of Pt on AuNRs is discussed. Individual AuNR displayed different optical responses depending on the location of deposited Pt. The experimental optical results are validated theoretically and correlated to the configuration of Pt layer, imaged by High-Resolution Electron Microscopic imaging. Plasmonic nanoparticles exhibit field distortions when placed onto a substrate, which leads to an increased field intensity on the nanoparticle close to the substrate at the expense of the field intensity on top of the nanoparticles. Interestingly, the plasmon field distortion by the substrate is lowered upon Pt deposition. The prepared nanoparticle 2-D arrays are useful in photocatalysis and optically enhanced catalysis as they comprise an exciting plasmonic metal and a catalytically efficient metal.<br/>

Asymmetric deposition of platinum atoms on gold nanorods induced by a substrate for synthesis of anisotropic bimetallic nanostructures

2019 Fall National Meeting

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.