Journal
SCRIPTA MATERIALIA
Volume 62, Issue 3, Pages 137-140Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2009.10.018
Keywords
Porous material; Nanostructured material; Surface diffusion; Self-assembly; Dealloying
Categories
Funding
- National Natural Science Foundation of China [50971079, 50801031]
- 43rd China Postdoctoral Science Foundation
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Nanoporous gold (NPG) with ultrafine ligaments/channels (less than 10 nm) can be obtained by the dealloying of Al2Au in an alkaline solution at room temperature. The surface diffusivity of Au adatoms was evaluated as 2.1 x 10(-23), 2.3 x 10(-21) and 1.6 x 10(-19) m(2) s(-1) for the dealloying at 253, 298 and 368 K, respectively. The measurement of activation energy demonstrates that the formation and coarsening of NPG are governed by the Au diffusion at alloy/solution interfaces regardless of dealloying media. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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