Study of the Coarsening of Nanoporous Gold Nanowires by In Situ Scanning Transmission Electron Microscopy During Annealing

Adrien Chauvin, Leopoldo Molina-Luna, Junjun Ding, Chang Hwan Choi, Pierre Yves Tessier, Abdel Aziz El Mel

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Over the past decades, porous gold has been used in plenty of applications such as catalysis or sensor detection. However, the nanoscale size of both the ligaments and pores makes such material very sensible to temperature. Indeed, the increase in temperature induces coarsening of the structure which can be detrimental for various applications. In this context, understanding of the coarsening on nanoporous gold (NPG) is crucial. In this communication, in situ scanning transmission electron microscopy (STEM) analysis of coarsening is reported by considering the nanosize of the dealloyed sample in dependence on the annealing of NPG nanowire. This study is performed by the in situ STEM of NPG nanowires after annealing between 25 and 600 °C with two different feature ratios (i.e., ligament/pore size) of 0.6 and 1.4. Herein, for the first time, an experimental demonstration is carried out for the two different behaviors of morphology evolution with temperature, corresponding to ligament pinch-off and collapsing of nanoporous materials, which have been highlighted by simulations in the literature.

Original languageEnglish
Article number1900376
JournalPhysica Status Solidi - Rapid Research Letters
Volume13
Issue number11
DOIs
StatePublished - 1 Nov 2019

Keywords

  • annealing
  • coarsening
  • collapsing
  • nanoporous gold
  • nanowires
  • pinch-off

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