title: Formation of Au-Pt alloy nanoparticles on a Si substrate by simple dip-coating at room temperature.
abstract: Spherical Au-Pt alloy nanoparticles of 10 nm average size have been prepared on a H-terminated Si(100) substrate by an extremely simple method of dip-coating. X-ray photoelectron spectroscopy and glancing-incidence X-ray diffraction confirm the formation of Au-Pt alloy. The Au(3+) ions are first reduced on the Si substrate upon dipping, and the freshly formed Au nuclei then work as a "catalyst" by promoting the reduction of PtCl(6)(2-) ions on the Au nuclei. The subsequent interdiffusion of Au and Pt atoms leads to the observed alloy formation. The present method provides an environment-friendly, low-cost route to preparing anode electrodes in fuel cells.
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada.
authors.forename: Liyan
authors.initials: L
authors.lastname: Zhao
authors.forename: Nina
authors.initials: N
authors.lastname: Heinig
authors.forename: K T
authors.initials: KT
authors.lastname: Leung
mesh_terms: D000497:Alloys / Q000737:chemistry*; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D000497:Alloys; D010984:Platinum; D006046:Gold; D012825:Silicon