title: Electronic and magnetic properties of ultrathin Au/Pt nanowires.
abstract: We have reported the synthesis of Au(25)Pt(75) and Au(48)Pt(52) alloyed ultrathin nanowires with average widths of less than 3 nm via a wet chemistry approach at room temperature. Using a combination of techniques, including scanning transmission electron microscopy equipped with X-ray energy dispersive spectroscopy, ultraviolet-visible spectroscopy, and X-ray absorption near-edge structure and extended X-ray absorption fine structure spectroscopies, we identified the stoichiometry-dependent heterogeneous crystalline structures, as well as electronic structures with respect to the charge transfer between Pt and Au within both nanowires. In particular, we observed d-charge depletion at the Au site and the d-charge gain at the Pt site in Au(48)Pt(52) nanowires, which accounted for its ferromagnetic magnetic behavior, in contrast to the paramagnetism and diamagnetism appearing respectively in bulk Pt and Au.
authors: Department of Chemical Engineering, University of New Hampshire, Durham, New Hampshire 03824, USA. xw.teng@unh.edu
authors: Xiaowei
authors: X
authors: Teng
authors: Mikhail
authors: M
authors: Feygenson
authors: Qi
authors: Q
authors: Wang
authors: Jiaqing
authors: J
authors: He
authors: Wenxin
authors: W
authors: Du
authors: Anatoly I
authors: AI
authors: Frenkel
authors: Weiqiang
authors: W
authors: Han
authors: Meigan
authors: M
authors: Aronson
mesh_terms: D000497:Alloys / Q000138:chemical synthesis / Q000737:chemistry*; D004583:Electrons; D006046:Gold / Q000737:chemistry*; D008280:Magnetics; D008422:Materials Testing; D036103:Nanotechnology; D053770:Nanowires / Q000737:chemistry*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D000497:Alloys; D010984:Platinum; D006046:Gold