Publisher DOI: 10.1021/nn4021345
Title: Hierarchical nested-network nanostructure by dealloying
Language: English
Authors: Qi, Zhen 
Weissmüller, Jörg 
Keywords: dealloying;nanoporous metals;hierarchical structure;charge transport
Issue Date: 25-Jun-2013
Publisher: American Chemical Society
Source: ACS Nano 7 (7): 5948-5954 (2013)
Journal or Series Name: ACS nano 
Abstract (english): Applications of porous microstructures in functional materials often impose conflicting requirements on the pore size, which may be met by hierarchical structures that combine porosity on distinctly different length scales. Here we report an electrochemical dealloying strategy that yields bulk samples of porous gold with a hierarchical microstructure. A nanoscale network of solid ligaments forms the lower hierarchy level, which is nested within the geometrically similar, but much larger, network of the upper hierarchy level. Starting 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. We show that the material exhibits enhanced charge transport kinetics while maintaining a large specific surface area.
ISSN: 1936-086X
Institute: Werkstoffphysik und -technologie M-22 
Type: (wissenschaftlicher) Artikel
Funded by: Chinese Scholarship Council
Deutsche Forschungsgemeinschaft
Project: SFB 986: Teilprojekt B2 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle 
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