Platinum-catalyzed synthesis of water-soluble gold-platinum nanoparticles

Peter N. Njoki, Jin Luo, Lingyan Wang, Mathew M. Maye, Huzaifa Quaizar, Chuan Jian Zhong

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

The ability to control composition and size in the synthesis of bimetallic nanoparticles is important for the exploitation of the bimetallic catalytic properties. This paper reports findings of an investigation of a new approach to the synthesis of gold-platinum (AuPt) bimetallic nanoparticles in aqueous solution via one-phase reduction of AuCl 4 - and PtCl 4 2 using a combination of reducing and capping agents. Hydrogen served as a reducing agent for the reduction of Pt(II), whereas acrylate was used as a reducing agent for the reduction of Au(III). The latter reaction was found to be catalyzed by the formation of Pt as a result of the reduction of Pt(II). Acrylate also functioned as capping agent on the resulting nanocrystals. By controlling the feed ratios of AuCl 4 - and PtCl 4 2- and the relative concentrations of acrylate, an effective route for the preparation of AuPt nanoparticles with bimetallic compositions ranging from ∼4 to 90% Au and particle sizes ranging from 2 to 8 nm has been demonstrated. The composition, size, and shell properties were characterized using transmission electron microscopy, direct current plasma-atomic emission spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. Implications of the results to the exploration of bifunctional catalysts are also briefly discussed.

Original languageEnglish (US)
Pages (from-to)1623-1628
Number of pages6
JournalLangmuir
Volume21
Issue number4
DOIs
StatePublished - Feb 15 2005
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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  • Cite this

    Njoki, P. N., Luo, J., Wang, L., Maye, M. M., Quaizar, H., & Zhong, C. J. (2005). Platinum-catalyzed synthesis of water-soluble gold-platinum nanoparticles. Langmuir, 21(4), 1623-1628. https://doi.org/10.1021/la047555i