Preparation of Pd/Pt bimetallic nanoparticles in water/AOT/isooctane microemulsions

Ming Li Wu, Dong Hwang Chen, Ting Chia Huang

研究成果: Article同行評審

97 引文 斯高帕斯(Scopus)

摘要

Bimetallic nanoparticles of Pd and Pt at various molar ratios have been prepared by the coreduction of H2PdCl4and H2PtCl6with hydrazine in water/AOT/isooctane microemulsions at 25°C. The size, structure, and composition of the resultant nanoparticles were characterized by TEM, XRD, EDX, and XPS. It was shown that the bimetallic nanoparticles obtained at feeding compositions of [H2PdCl4]/[H2PtCl6] = 9/1 ∼1/9 were essentially monodispersed and that their mean diameters with a positive deviation were in the range of 7 ∼ 11 nm. The bimetallic nanoparticles had a homogeneous alloy structure except when the molar ratio of Pd/Pt was above 9/1. Also, the composition of each particle was roughly consistent with that of the feeding solution. Furthermore, the characterization and formation kinetics of the particles suggested that the reduction of PtCl-6and PdCl4-2ions was finished before the formation of nuclei, the nucleation rate of Pd was much faster than that of Pt, the size of bimetallic nanoparticles was determined by the number of the nuclei formed at the beginning of reaction, and the nuclei for a bimetallic system might be composed of Pd and Pt. According to these, a formation process for Pd/Pt bimetallic nanoparticles was suggested.

原文English
頁(從 - 到)102-108
頁數7
期刊Journal of Colloid And Interface Science
243
發行號1
DOIs
出版狀態Published - 2001 十一月 1

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 生物材料
  • 表面、塗料和薄膜
  • 膠體和表面化學

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