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Unidirectional thermal diffusion in bimetallic Cu@Au nanoparticles.

Shoujie Liu1, Zhihu Sun, Qinghua Liu

  • 1National Synchrotron Radiation Laboratory, University of Science and Technology of China , Hefei, Anhui 230029, People's Republic of China.

ACS Nano
|January 30, 2014
PubMed
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This study reveals unidirectional atomic diffusion in nanoscale copper-gold core-shell structures. Gold atoms migrate into the copper core, influenced by intermetallic compound formation and nanoscale effects.

Area of Science:

  • Nanomaterials Science
  • Surface Chemistry
  • Solid-State Physics

Background:

  • Controlling nanomaterial synthesis and application requires understanding nanoscale atomic diffusion.
  • Core-shell nanostructures offer unique properties due to their distinct material interfaces.

Purpose of the Study:

  • To investigate the atomic diffusion dynamics in thermally alloying copper-gold (Cu@Au) core-shell nanoparticles.
  • To elucidate the mechanism of diffusion at the nanoscale.

Main Methods:

  • In situ X-ray absorption spectroscopy (XAS) was employed to monitor diffusion.
  • Theoretical calculations were used to complement experimental observations.

Main Results:

  • Unidirectional diffusion of gold (Au) atoms from the shell to the copper (Cu) core was observed.

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  • Initial diffusion at 423 K formed a CuAu-like intermetallic compound layer.
  • Further diffusion involved Au atom migration into the Cu matrix at higher temperatures (453–553 K).

    • Conclusions:

    • The formation of a CuAu-like intermetallic compound influences diffusion pathways.
    • Nanosized effects significantly impact atomic diffusion dynamics in core-shell structures.