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Synthesis and Characterization of Novel Au(core)-Au/Pt Alloy(shell) Nanostructure

Published online by Cambridge University Press:  21 March 2011

Ru-Shi Liu ,
Hau-Ming Chen  and
Shu-Fen Hu
Ru-Shi Liu
Affiliation:
Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
Hau-Ming Chen
Affiliation:
Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
Shu-Fen Hu
Affiliation:
National Nano Device Laboratories, Hsinchu 300, Taiwan
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Abstract

A systematic study is reported about the amount-dependent morphology change in a series of Au-Pt bimetallic nanoparticles synthesized using chemical reduction. The amount of Au precursor is kept constant throughout whole series of compounds to obtain fixed Au core size (∼7.5 nm). The Au/Pt ratio is varied from 1/1 to 1/4 in order to synthesize Pt shell layer of different thickness. We observed a remarkable shift of surface plasmon band around 410 nm. With the aid of high resolution transmission electron microscope (HRTEM) and energy-dispersive spectrometer (EDS), the composition of shell layer is found to be Pt enriched Au-Pt alloy. As the amount of Pt increases, the Pt clusters formed a string-like shape on the surface of nanoparticles. The average diameter of these Pt clusters is about 2 nm. This special structure may exhibit unique catalytic property.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 818: Symposium M – Nanoparticles and Nanowire Building Blocks-Synthesis, Processing, Characterization and Theory , 2004 , M5.45.1
Copyright
Copyright © Materials Research Society 2004

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