Sonochemical immobilization of noble metal nanoparticles on the surface of maghemite: Mechanism and morphological control of the products

Yoshiteru Mizukoshi, Yasuhiro Tsuru, Aki Tominaga, Satoshi Seino, Naoya Masahashi, Shuji Tanabe, Takao A. Yamamoto

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Aqueous sample solutions containing noble metal ions (HAuCl4, Na2PdCl4, H2PtCl6), polyethyleneglycol monostearate, and magnetic maghemite nanoparticles were irradiated with high power ultrasound. Analyses of the products showed that noble metal ions were reduced by the effects of ultrasound, and the formed noble metal nanoparticles were uniformly immobilized on the surface of the maghemite. The present "one pot process" significantly simplifies the immobilization of noble metal nanoparticles on the surface of supports, compared with the conventional impregnation method. The average diameter of immobilized Au was 7-13 nm, and the diameters of Pd and Pt were several nm. The diameters depended upon the concentration of polyethyleneglycol monostearate and the concentration of noble metal ions, but not upon the maghemite concentration, indicating the possibility of the morphological controls of the products by adjusting these preparation conditions. The measurements of the average diameters and the numbers of immobilized Au nanoparticles obtained under various conditions suggest that the nucleation of Au does not occur on the surface of maghemite, but it might occur in the homogeneous bulk solution.

Original languageEnglish
Pages (from-to)875-880
Number of pages6
JournalUltrasonics Sonochemistry
Volume15
Issue number5
DOIs
Publication statusPublished - 2008 Jul

Keywords

  • Magnetic substance
  • Nanocomposite
  • Noble metal
  • Sonochemical reduction

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Environmental Chemistry
  • Radiology Nuclear Medicine and imaging
  • Acoustics and Ultrasonics
  • Organic Chemistry
  • Inorganic Chemistry

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