Synthesis and characterization of nano metals with core-shell structure--颗粒学报PARTICUOLOGY

Liu, R.-S., Chen, H.-M., & Hu, S.-F. (2004). Synthesis and characterization of nano metals with core-shell structure. China Particuology, 2(4), 160-163. https://doi.org/10.1016/S1672-2515(07)60048-7

Synthesis and characterization of nano metals with core-shell structure

Ru-Shi Liu ^a, Hau-Ming Chen ^a, Shu-Fen Hu ^b

a Department of Chemistry, Taiwan University, Taipei 106, China
b Nano Device Laboratories, Hsinchu 300, China

10.1016/S1672-2515(07)60048-7

Volume 2, Issue 4, August 2004, Pages 160-163

Received 12 July 2004, Accepted 25 July 2004, Available online 27 November 2007.

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Highlights

Abstract

Using Au_core-Pt_shell as an example, the synthesis and characterization of nano metals with core-shell structure is demonstrated in a systematic study on the amount-dependent morphology change in a series of Au-Pt bimetallic nanoparticles synthesized using chemical reduction. While the amount of Au precursor is kept constant throughout the whole series of compounds to obtain a 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 layers of different thickness. We observed a remarkable shift of surface plasmon band to around 410 nm. With the aid of high resolution transmission electron microscope (HRTEM) and energy-dispersive spectrometer (EDS), the composition of the shell layer is found to be a Pt-enriched Au-Pt alloy. As the amount of Pt increases, string-like Pt clusters form on the surface of the nanoparticles. The average diameter of these Pt clusters is about 2 nm. This special structure may possess unique catalytic properties.

Graphical abstract

Keywords

nanoparticle; bimetallic; gold; core-shell

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