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Publisher DOI: 10.1039/c7cp05706g
Title: Dealloying progress during nanoporous structure evolution analyzed by In situ resistometry
Language: English
Authors: Steyskal, Eva-Maria 
Seidl, Michael 
Graf, Matthias 
Würschum, Roland 
Keywords: nanoporous gold
Issue Date: 25-Oct-2017
Publisher: Royal Society of Chemistry (RSC)
Source: Physical Chemistry Chemical Physics 44 (19): 29880-29885 (2017)
Journal or Series Name: Physical chemistry, chemical physics 
Abstract (english): The progress of dealloying, an electrochemical synthesis method capable of producing nanoporous structures with bulk outer dimensions, is studied by in situ resistometry. The resistance increases by three orders of magnitude while nanoporous gold or platinum is formed. Simultaneous monitoring of charge flow and electrical resistance increase proves to be an ideal combination for analyzing the etching progress, which in accordance with recent studies can be demonstrated to occur in two steps referred to as 'primary (or bulk) dealloying' and 'secondary (or ligament) dealloying'. A model is developed, which describes the resistance increase during etching as governed by the reduction of the master alloy backbone in favor of the nanoporous structure. This new approach allows an evaluation of the etching front propagation (primary dealloying) as well as the status of the already porous structure (secondary dealloying).
DOI: 10.15480/882.2153
ISSN: 1463-9084
Institute: Werkstoffphysik und -technologie M-22 
Type: (wissenschaftlicher) Artikel
License: CC BY-NC 3.0 (Attribution-NonCommercial) CC BY-NC 3.0 (Attribution-NonCommercial)
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