Ultrafine Nanoporous Gold via Thiol Compound-Mediated Chemical Dealloying

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)10026-10031
Journal / PublicationJournal of Physical Chemistry C
Issue number18
Online published15 Apr 2020
Publication statusPublished - 7 May 2020


Nanoporous gold (NPG), whose chemical and physical properties largely depend on its ligament size and pore size, is attractive for many applications. However, it is difficult to achieve NPG with ultrasmall structural features. Here, we report a convenient thiol compound-mediated dealloying method for fabricating NPG with feature size down to 4 nm (one of the smallest values reported to date) at an ambient air condition. It is unraveled that the ultrafine ligament and pore sizes were mainly due to the lowered diffusion rate of the Au atoms at the alloy/electrolyte interface upon forming complexes with the thiol compounds in the etchant. This work opens a new route for conveniently controlling the structural features of dealloyed nanoporous materials.