Nanoporous gold made by selective dissolution of silver from Ag-Au alloys immersed in nitric acid. (A) cross-section of dealloyed Au32%Ag68% thin film. (B) Plan-view of dealloyed Au26%Ag74% bulk material. The porosity is open and ligament spacings as small as 5 nm have been observed. Measurements of the surface area are of order 2 m2/g, comparable to commercial supported catalysts.
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