Abstract
Argon-saturated aqueous solutions of NaAuCl 4 and PdCl 2 or K 2PtCl 4 were reduced simultaneously by ultrasound irradiation to prepare noble metal alloy nanoparticles. Droplets recovered from colloidal dispersions were placed on carbon-supported copper grids, and dried in a vacuum. They were examined by TEM, HRTEM, and nano-area energy dispersion X-ray spectroscopy(EDX). The Au-Pd nanoparticles exhibited monodispersive distribution (8 nm), and consisted of a gold core and a palladium shell. Au-Pt alloy nano-particles could not be produced from NaAuCl 4 and K 2PtCl 4 aqueous solutions either by simultaneous or successive reduction.
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