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1 Osaka Prefecture University Research Institute for Advanced Science
and Technology, 1-2 Gakuen-cho, Sakai, Osaka 599-8570, Japan
2 Kyoto University Research Reactor Institute, Noda, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
| Solutions containing Au3+/Pd2+ and Au3+/Pt4+ ions were reduced in the presence of surfactants (SDS or PEG-MS) by ultrasound irradiation (200kHz, 4.2W/cm2). The obtained colloidal bimetallic nanoparticles of Au/Pd or Au/Pt were examined by UV-vis spectra, XRD, TEM, HRTEM, EDX, hydrogenation catalysis measurements and 197Au Mössbauer spectroscopy. It was found that the prepared nanoparticles exhibited different morphologies with changing the irradiation parameters and the surfactants. The 197Au Mössbauer spectroscopy clearly indicated that electronic structures of Au atoms of the core-shell structured nanoparticles are different from the bulk materials. |
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