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Nanomaterials 2014, 4(4), 856-878; doi:10.3390/nano4040856

Impact of the De-Alloying Kinetics and Alloy Microstructure on the Final Morphology of De-Alloyed Meso-Porous Metal Films

Institute for Frontier Materials, Deakin University, Waurn Ponds, VIC 3216, Australia
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Received: 23 July 2014 / Revised: 1 October 2014 / Accepted: 8 October 2014 / Published: 17 October 2014
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)
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Abstract

Nano-textured porous metal materials present unique surface properties due to their enhanced surface energy with potential applications in sensing, molecular separation and catalysis. In this paper, commercial alloy foils, including brass (Cu85Zn15 and Cu70Zn30) and white gold (Au50Ag50) foils have been chemically de-alloyed to form nano-porous thin films. The impact of the initial alloy micro-structure and number of phases, as well as chemical de-alloying (DA) parameters, including etchant concentration, time and solution temperature on the final nano-porous thin film morphology and properties were investigated by electron microscopy (EM). Furthermore, the penetration depth of the pores across the alloys were evaluated through the preparation of cross sections by focus ion beam (FIB) milling. It is demonstrated that ordered pores ranging between 100 nm and 600 nm in diameter and 2–5 μm in depth can be successfully formed for the range of materials tested. The microstructure of the foils were obtained by electron back-scattered diffraction (EBSD) and linked to development of pits across the material thickness and surface during DA. The role of selective etching of both noble and sacrificial metal phases of the alloy were discussed in light of the competitive surface etching across the range of microstructures and materials tested. View Full-Text
Keywords: de-alloying (DA) kinetics; through pores formation; metal surface texture; micro-structure morphology relationship de-alloying (DA) kinetics; through pores formation; metal surface texture; micro-structure morphology relationship
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lin, B.; Kong, L.; Hodgson, P.D.; Dumée, L.F. Impact of the De-Alloying Kinetics and Alloy Microstructure on the Final Morphology of De-Alloyed Meso-Porous Metal Films. Nanomaterials 2014, 4, 856-878.

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