| Abstract
| - Nanoporous films (NPFs) of copper, silver, and gold were directly fabricated on the corresponding metalsubstrates by a general alloying/dealloying process. This process involved the electrodeposition of Zn onmetal surfaces, thermal alloying, and chemical dealloying of Zn. Electrodeposition of Zn on metal substrateswas realized in commercial Zn plating electrolyte at room temperature. Then surface zinc−metal alloys wereformed by thermal treatment at relatively low temperatures (below 150 °C) in nitrogen gas. By immersingthe alloys in etching solutions, we obtained metal NPFs through chemical dissolution of Zn from the alloys.Characterization results showed that the morphologies and porous structures of the products were greatlyaffected by the thickness of the deposited Zn layer and thermal alloying temperature. Moreover, preliminarytesting showed that the as-prepared gold NPF possessed a higher surface area than the polish one. Furthermore,the Au NPF could serve as a nanoporous skeleton for fabricating Pt-coated a Au NPF electrode. The oxidationcurrent of glucose was improved about 180 times when using the resulting Pt-coated Au NPF compositeelectrode instead of the polished Pt electrode. This study provides a general method to directly fabricatenanoporous metal films on the corresponding metal substrates.
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