title: Preparation and characterization of aqueous colloids of Pt-Ru nanoparticles.
abstract: A synthetic method for platinum-ruthenium (PtRu) nanoparticles in aqueous media is proposed. This method employs citric acid as a capping agent and NaBH(4) as a reducing agent with the aid of pH control. The number-averaged size of the PtRu nanoparticles was ca. 2 nm. The crystal phase and chemical composition of the nanoparticles was investigated by X-ray diffraction measurement and scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy analysis, which indicated that the nanoparticles mainly consisted of an alloy of Pt and Ru. Electrochemical measurement showed that the PtRu nanoparticles had catalytic activity for methanol oxidation.
authors.affiliation: Advanced Research Laboratory, Hitachi Ltd., 7-1-1 Omika-cho, Hitachi 319-1292, Japan.
authors.forename: Yuzuru
authors.initials: Y
authors.lastname: Shimazaki
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Shinji
authors.initials: S
authors.lastname: Yamada
authors.forename: Takao
authors.initials: T
authors.lastname: Miwa
authors.forename: Mikio
authors.initials: M
authors.lastname: Konno
mesh_terms: D000497:Alloys / Q000138:chemical synthesis / Q000737:chemistry; D002384:Catalysis; D003102:Colloids / Q000138:chemical synthesis* / Q000737:chemistry*; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D000432:Methanol / Q000737:chemistry; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D003102:Colloids; D014867:Water; D010984:Platinum; D012428:Ruthenium; D000432:Methanol