Abstract
The colloidal dispersions of polymer-protected platinum/rhodium bimetallic cluster particles are easily prepared by refluxing solutions of hexachloroplatinic(IV) acid and rhodium(III) chloride in ethanol/water (1/1 v/v) in the presence of poly(N-vinyl-2-pyrrolidone). These colloidal dispersions of the Pt/Rh bimetallic cluster particles are very stable and have a size distribution from 2 to 7 nm in diameter. The electronic spectra and the transmission electron micrographs suggest that the colloidal dispersions are not a mixture of monometallic Rh and monometallic Pt particles but are mostly composed of Pt/Rh alloy particles
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