Electronic and magnetic properties of ultrathin Au/Pt nanowires.
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.
Teng
Xiaowei
X
Department of Chemical Engineering, University of New Hampshire, Durham, New Hampshire 03824, USA. xw.teng@unh.edu
Feygenson
Mikhail
M
Wang
Qi
Q
He
Jiaqing
J
Du
Wenxin
W
Frenkel
Anatoly I
AI
Han
Weiqiang
W
Aronson
Meigan
M
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
D000497:Alloys; D010984:Platinum; D006046:Gold