Dealloying Kinetics of AgAu Nanoparticles by in Situ Liquid-Cell Scanning Transmission Electron Microscopy

Pan Liu, Qing Chen, Yoshikazu Ito, Jiuhui Han, Shufen Chu, Xiaodong Wang, Kolan Madhav Reddy, Shuangxi Song, Akihiko Hirata, Mingwei Chen

研究成果: Article

抜粋

Understanding the formation and evolution of bicontinuous nanoporous structure during dealloying has been one of the most challenging subjects of dealloying research. However, previous in situ investigations either suffer from insufficient spatial resolution (e.g., X-ray tomography) or lack morphology visualization and mass information (e.g., scanning tunneling microscopy). In this work, we report the kinetics of the whole course of dealloying by utilizing liquid-cell aberration-corrected scanning transmission electron microscopy. With Z-contrast imaging analysis, the in situ sub-nanoscale characterization reveals two new phenomena, an initial period of dealloying indicative of an initial length scale for bulk dealloying and a large volume shrinkage in a nanoscale alloy precursor. We explain the particle-size-dependent volume shrinkage with the formation of a dense shell and quantify the dependence with a simple geometric model. These insights into the mechanisms of dealloying will enable deliberate designs of nanoporous structures.

元の言語English
ページ(範囲)1944-1951
ページ数8
ジャーナルNano Letters
20
発行部数3
DOI
出版物ステータスPublished - 2020 3 11
外部発表Yes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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  • これを引用

    Liu, P., Chen, Q., Ito, Y., Han, J., Chu, S., Wang, X., Reddy, K. M., Song, S., Hirata, A., & Chen, M. (2020). Dealloying Kinetics of AgAu Nanoparticles by in Situ Liquid-Cell Scanning Transmission Electron Microscopy. Nano Letters, 20(3), 1944-1951. https://doi.org/10.1021/acs.nanolett.9b05216