Morphology and Surface Plasma Changes of Au–Pt Bimetallic Nanoparticles
In this study, we examined the amount-dependent change in morphology in a series of Au–Pt bimetallic nanoparticles synthesized using chemical reduction. The amount of Au precursor was kept constant throughout the experiment. The Au/Pt molar ratio was varied from 1/1 to 1/4 to synthesize Pt shell layers with different thicknesses. We observed a remarkable shift of the surface plasmon band at around 410 nm. By high-resolution transmission electron microscopy (HRTEM) and energy-dispersive spectrometry (EDS), the composition of the shell layer was found to be Pt-enriched Au–Pt alloy. As the concentration of Pt increases, Pt clusters (ca. 1.8 nm in diameter) form a string-like shape on the surface of nanoparticles.
Keywords: AU/PT; BIMETALLIC; CORE-SHELL; NANOPARTICLES
Document Type: Research Article
Publication date: 01 May 2006
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