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Ambient-stable tetragonal phase in silver nanostructures

Author

Listed:
  • Yugang Sun

    (Center for Nanoscale Materials, Argonne National Laboratory)

  • Yang Ren

    (Advanced Photon Source, Argonne National Laboratory)

  • Yuzi Liu

    (Center for Nanoscale Materials, Argonne National Laboratory)

  • Jianguo Wen

    (Electron Microscopy Center, Argonne National Laboratory)

  • John S. Okasinski

    (Advanced Photon Source, Argonne National Laboratory)

  • Dean J. Miller

    (Electron Microscopy Center, Argonne National Laboratory)

Abstract

Crystallization of noble metal atoms usually leads to the highly symmetric face-centred cubic phase that represents the thermodynamically stable structure. Introducing defective microstructures into a metal crystal lattice may induce distortions to form non-face-centered cubic phases when the lateral dimensions of objects decrease down to nanometre scale. However, stable non-face-centered cubic phases have not been reported in noble metal nanoparticles. Here we report that a stable body-centred tetragonal phase is observed in silver nanoparticles with fivefold twinning even at ambient conditions. The body-centered tetragonal phase originates from the distortion of cubic silver lattices due to internal strains in the twinned nanoparticles. The lattice distortion in the centre of such a nanoparticle is larger than that in the surfaces, indicating that the nanoparticle is composed of a highly strained core encapsulated in a less-strained sheath that helps stabilize the strained core.

Suggested Citation

  • Yugang Sun & Yang Ren & Yuzi Liu & Jianguo Wen & John S. Okasinski & Dean J. Miller, 2012. "Ambient-stable tetragonal phase in silver nanostructures," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1963
    DOI: 10.1038/ncomms1963
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    1. Stoševski, Ivan & Krstić, Jelena & Milikić, Jadranka & Šljukić, Biljana & Kačarević-Popović, Zorica & Mentus, Slavko & Miljanić, Šćepan, 2016. "Radiolitically synthesized nano Ag/C catalysts for oxygen reduction and borohydride oxidation reactions in alkaline media, for potential applications in fuel cells," Energy, Elsevier, vol. 101(C), pages 79-90.

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