title: Morphology and surface plasma changes of Au-Pt bimetallic nanoparticles.
abstract: 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.
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei 106, Taiwan, Republic of China.
authors.forename: Hao Ming
authors.initials: HM
authors.lastname: Chen
authors.forename: Hsin-Chieh
authors.initials: HC
authors.lastname: Peng
authors.forename: Ru-Shi
authors.initials: RS
authors.lastname: Liu
authors.forename: Shu-Fen
authors.initials: SF
authors.lastname: Hu
authors.forename: Hwo-Shuenn
authors.initials: HS
authors.lastname: Sheu
mesh_terms: D000497:Alloys / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D004563:Electrochemistry / Q000379:methods; D005740:Gases / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D006358:Hot Temperature; D008422:Materials Testing; D008670:Metals / Q000737:chemistry; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000497:Alloys; D005740:Gases; D008670:Metals; D010984:Platinum; D006046:Gold