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Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (7): 1397.

• Articles • Previous Articles     Next Articles

Photochemical Synthesis and Characterization of Gold@Palladium Core-Shell Composite Nanoparticles

DONG Ying-Nan, DONG Shou-An*, TANG Chun   

  1. Kunming Institute of Precious Metals, Kunming 650106, China
  • Received:2008-05-12 Revised:2009-04-17 Online:2009-07-10 Published:2009-07-10
  • Contact: DONG Shou-An. E-mail: dsa8748@gmail.com
  • Supported by:

    国家自然科学基金(批准号: 20863003)资助.

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Abstract:

The combined gold and palladium bimetallic nanoparticles were received significant attention because of their special catalytic properties and Surface-enhanced Raman scatterings. In this paper, we report a new synthesis of Au@Pd core-shell composite nanoparticles by the photochemical method. The bimetallic nanoparticles with an Au core@Pd shell composite structure were synthesized in PEG-acetone solution by UV photochemical reduction, using both approaches of simultaneous reduction of Au(Ⅲ) and Pd(Ⅱ) ions and Au seeding growth in the presence of Pd(Ⅱ). The bimetallic nanoparticles sizes obtained by two approaches are between 5.6—4.6 and 4.6—6.2 nm, respectively. The sizes of composite particles and the thickness of the palladium shell can be tuned by varying molar ratio of Au(Ⅲ) or Au(0) and Pd(Ⅱ). Based on the characterizations by UV-Vis, XPS, TEM and HR-TEM, an Au core@Pd shell nanostructure was confirmed and a special changing tendency of the composite particle size with a changing of Au∶Pd molar ratio was found. The effect of the Pd shell gaining d-electrons from the Au core and the mechanism of forming Au core@Pd shell nanostructure were discussed.

Key words: Au core@Pd shell; Composite nanostructure; Photochemical synthesis; Characterization; d-Electron

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