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Research Article

Morphology-controlled transformation of Cu@Au core-shell nanowires into thermally stable Cu3Au intermetallic nanowires

Zhiqiang Niu1,3,§, Shouping Chen2,4,§, Yi Yu5, Teng Lei1, Ahmad Dehestani3, Kerstin Schierle-Arndt3, Peidong Yang1,2,3,4,6( )
Department of Chemistry, University of California, Berkeley, California 94720, USA
Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
California Research Alliance (CARA), BASF Corporation, Berkeley, California 94720, USA
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Kavli Energy NanoScience Institute, Berkeley, California 94720, USA

§ Zhiqiang Niu and Shouping Chen contributed equally to this work.

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Abstract

Multimetallic nanowires with long-range atomic ordering hold the promise of unique physicochemical properties in many applications. Here we demonstrate the synthesis and study the stability of Cu3Au intermetallic nanowires. The synthesis is achieved by using Cu@Au core-shell nanowires as precursors. With appropriate Cu/Au stoichiometry, the Cu@Au core-shell nanowires are transformed into fully ordered Cu3Au nanowires under thermal annealing. Thermally-driven atom diffusion accounts for this transformation as revealed by X-ray diffraction and electron microscopy studies. The twin boundaries abundant in the Cu@Au core-shell nanowires facilitate the ordering process. The resulting Cu3Au intermetallic nanowires have uniform and accurate atomic positioning in the crystal lattice, which enhances the nobility of Cu. No obvious copper oxides are observed in fully ordered Cu3Au nanowires after annealing in air at 200 oC, a temperature that is much higher than those observed in Cu@Au core-shell and pure Cu nanowires. This work opens up an opportunity for further research into the development and applications of intermetallic nanowires.

Keywords

intermetallic nanocrystalshape controlnanowireCu-Austability

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Nano Research
Volume 13 Issue 9,
September 2020
Pages 2564-2569
DOI: 10.1007/s12274-020-2900-z
Cite this article:
Niu Z, Chen S, Yu Y, et al. Morphology-controlled transformation of Cu@Au core-shell nanowires into thermally stable Cu3Au intermetallic nanowires. Nano Research, 2020, 13(9): 2564-2569. https://doi.org/10.1007/s12274-020-2900-z
Topics:
Binary alloysCopper oxidesGold alloysIntermetallicsMorphologyNanowiresPhysicochemical propertiesShells (structures)

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Received: 10 April 2020
Revised: 08 May 2020
Accepted: 22 May 2020
Published: 21 June 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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