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


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.

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This work was performed under contact Nos. NSC92-2113-M-002-036 and NSC92-2215-E-492 -008 from the National Science Council of the Republic of China.

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Correspondence to Ru-Shi Liu.

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Liu, RS., Chen, HM. & Hu, SF. Synthesis and Characterization of Novel Au(core)-Au/Pt Alloy(shell) Nanostructure. MRS Online Proceedings Library 818, 299–304 (2004).

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