title: Preparation of Pt/Rh bimetallic colloidal particles in polymer solutions using borohydride-reduction.
abstract: Colloidal dispersions of Pt/Rh bimetallic particles have been synthesized by the reduction of Pt(IV)/Rh(III) ionic solutions by using borohydride-reduction in the presence of poly(N-vinyl-2-pyrrolidone). The size and the structure of the synthesized particles have been examined by transmission electron micrograph (TEM) and extended X-ray absorption fine structure (EXAFS). We have succeeded in producing the bimetallic Pt/Rh particles with an average diameter of 2.8 nm in polymer solutions by the stepwise addition of sodium borohydride aqueous solution. The distribution of different metallic species in a particle tended to be "cluster-in-cluster" structure, in contrast to the bimetallic particle with an average diameter of 1.4 nm synthesized by alcohol-reduction which have a core-shell structure.
authors.affiliation: Department of Health Science and Clothing Environment, Faculty of Human Life and Environment, Nara Women's University, Nara 630-8506, Japan. harada@cc.nara-wu.ac.jp
authors.forename: Masafumi
authors.initials: M
authors.lastname: Harada
authors.forename: Hisahiro
authors.initials: H
authors.lastname: Einaga
mesh_terms: D001894:Borohydrides / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D010984:Platinum / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012238:Rhodium / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods
chemical_list: D001894:Borohydrides; D011108:Polymers; D010984:Platinum; D012238:Rhodium