Preparation of platinum nanoparticles by sonochemical reduction of the Pt(II) ion

Yoshiteru Mizukoshi, Ryuichiro Oshima, Yasuaki Maeda, Yoshio Nagata

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)

Abstract

Platinum nanoparticles were prepared in an aqueous system using high-intensity ultrasound (200 kHz, 6 W cm-2). The particles formed in the presence of a surfactant (sodium dodecyl sulfate, SDS) were stable, homogeneously spherical, and relatively monodispersed with an average 2.6 nm diameter. The rate of formation of the platinum nanoparticles was 26.7 μM min-1 in the Pt(II)-SDS system. Reducing species generated near and/or in the hot bubbles, which were sonochemically induced in the media, would react with the PtCl42- complexes to form the platinum nanoparticles. Three kinds of the reducing species were proposed to be formed in the sonicated system: (a) radicals formed from the thermal decomposition of SDS at the interfacial region between the cavitation bubbles and bulk solution; (b) radicals formed via reactions of the hydroxyl radicals or hydrogen atoms with SDS; (c) hydrogen atoms. During the reduction of the Pt(II) ion, (b) and (c) ((b) > (c)) may be effective while (a) is only slightly effective, whereas in the cases of gold and palladium nanoparticles (a) was the main reductive species.

Original languageEnglish
Pages (from-to)2733-2737
Number of pages5
JournalLangmuir
Volume15
Issue number8
DOIs
Publication statusPublished - 1999 Apr 13

ASJC Scopus subject areas

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

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