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Microstructure and electronic behavior of PtPd@Pt core-shell nanowires

Published online by Cambridge University Press:  31 January 2011

Wei-Qiang Han ,
Dong Su ,
Michael Murphy ,
Matthew Ward ,
Tsun-Kong Sham ,
Lijun Wu ,
Yimei Zhu ,
Yongfeng Hu  and
Toshihiro Aoki
Dong Su
Affiliation:
Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973
Tsun-Kong Sham
Affiliation:
Department of Chemistry, University of Western Ontario, London, Ontario, N6A 5B7 Canada
Yimei Zhu
Affiliation:
Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973
Yongfeng Hu
Affiliation:
Canadian Light Source, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 0X4 Canada
Toshihiro Aoki
Affiliation:
JEOL USA, Inc., Peabody, Massachusetts 01961
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Abstract

PtPd@Pt core-shell ultrathin nanowires were prepared using a one-step phase-transfer approach. The diameters of the nanowires range from 2 to 3 nm, and their lengths are up to hundreds of nanometers. Line scanning electron energy loss spectra showed that PtPd bimetallic nanowires have a core-shell structure, with a PtPd alloy core and a Pt monolayer shell. X-ray absorption near edge structure (XANES) spectra reveal that a strong Pt-Pd interaction exists in this nanowire system in that there is PtPd alloying and/or interfacial interaction. Extended x-ray absorption fine structures (EXAFS) further confirms the PtPd@Pt core-shell structure. The bimetallic nanowires were determined to be face-centered cubic structures. The long-chain organic molecules of n-dodecyl trimethylammonium bromide and octadecylamine, used as surfactants during synthesis, were clearly observed using aberration-corrected TEM operated at 80 KV. The interaction of Pt and surfactants was also revealed by EXAFS.

Keywords

Core/shellElectron energy loss spectroscopy (EELS)Extended x-ray absorption fine structure (EXAFS)

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Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 4 , April 2010 , pp. 711 - 717
Copyright
Copyright © Materials Research Society 2010

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