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Study of the Coarsening of Nanoporous Gold Nanowires by In Situ Scanning Transmission Electron Microscopy During Annealing
Author(s) -
Chauvin Adrien,
Molina-Luna Leopoldo,
Ding Junjun,
Choi Chang-Hwan,
Tessier Pierre-Yves,
El Mel Abdel-Aziz
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201900376
Subject(s) - nanoporous , annealing (glass) , materials science , nanowire , transmission electron microscopy , scanning electron microscope , nanotechnology , porosity , crystallite , scanning transmission electron microscopy , in situ , nanoscopic scale , chemical engineering , composite material , metallurgy , chemistry , organic chemistry , engineering
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.