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    Bulk nested-network nanoporous gold via dealloying
    (2015)
    Qi, Zhen
    ;
    Weissmüller, Jörg
    A two-step dealloying strategy has been established via controlled dealloying to fabricate hierarchical nanoporous gold which has two well distinguished levels of ligaments from a bulk solid. Starting out from a dilute solid solution of Au in Ag, controlled electrochemical corrosion yields nanoporous Ag-Au alloy as an intermediate product. Coarsening of the porous alloy creates the large ligaments of the upper hierarchy level. Those are then again dealloyed, which creates the fine ligaments of the lower hierarchy level. The material exhibits enhanced charge transport kinetics while maintaining a large specific surface area. Similar two-step dealloying strategy as the dilute Ag-Au alloy, a Ag-Au-Pt alloy was chosen to fabricate hierarchical nanoporous gold with an ultrafine lower hierarchy level ligament size. The lower hierarchy level ligament size is as small as 6 nm.
    Publicationtype: Doctoral Thesis
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