Electronic and magnetic properties of ultrathin Au/Pt nanowires.

Academic Article

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

  • Teng, Xiaowei
  • Feygenson, Mikhail
  • Wang, Qi
  • He, Jiaqing
  • Du, Wenxin
  • Frenkel, Anatoly I
  • Han, Weiqiang
  • Aronson, Meigan
  • Status

    Publication Date

  • September 2009
  • Published In

  • Nano Letters  Journal
  • Keywords

  • Alloys
  • Electrons
  • Gold
  • Magnetics
  • Materials Testing
  • Nanotechnology
  • Nanowires
  • Particle Size
  • Platinum
  • Surface Properties
  • Temperature
  • Digital Object Identifier (doi)

    Pubmed Id

  • 19645434
  • Start Page

  • 3177
  • End Page

  • 3184
  • Volume

  • 9
  • Issue

  • 9