Facile fabrication of Ag-Pd bimetallic nanoparticles in ultrathin TiO 2-gel films: Nanoparticle morphology and catalytic activity

Junhui He, Izumi Ichinose, Toyoki Kunitake, Aiko Nakao, Yukihide Shiraishi, Naoki Toshima

Research output: Contribution to journalArticlepeer-review

214 Citations (Scopus)


Ag-Pd bimetallic nanoparticles were prepared directly in ultrathin TiO 2-gel films by a stepwise ion-exchange/reduction approach. Ion-exchange sites were created in ultrathin films using Mg2+ ions as template. Ag+ ion was then incorporated by ion exchange, and converted into metallic nanoparticles by low-temperature H2 plasma, regenerating ion-exchange sites. The same procedure was then carried out for Pd2+ ion, producing Pd-on-Ag bimetallic nanoparticles, as TEM observation and plasmon resonance absorption indicate. By contrast, reversed metal incorporation procedure appeared to give a mixture of individual Ag and Pd nanoparticles, as confirmed by TEM, absorption spectroscopy and X-ray photoelectron spectroscopy. For hydrogenation of methyl acrylate, the catalytic activity of the Pd-on-Ag nanoparticle is 367 times as large as that of commercial Pd black and 1.6 times as large as that of Pd monometallic nanoparticle. The outstanding catalytic activity was explicable by the large fraction of the surface-exposed Pd atoms. The formation process of the bimetallic nanoparticle and their general morphological feature are discussed.

Original languageEnglish
Pages (from-to)11034-11040
Number of pages7
JournalJournal of the American Chemical Society
Issue number36
Publication statusPublished - Sep 10 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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