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On the microstructure of nanoporous gold: an X-ray diffraction study.

Authors
Type
Published Article
Journal
Nano letters
Publication Date
Volume
9
Issue
3
Pages
1158–1163
Identifiers
DOI: 10.1021/nl803799q
PMID: 19193021
Source
Medline
License
Unknown

Abstract

The evolution of the grain structure, internal strain, and the lattice misorientations of nanoporous gold during dealloying of bulk (3D) Ag-Au alloy samples was studied by various in situ and ex situ X-ray diffraction techniques including powder and Laue diffraction. The experiments reveal that the dealloying process preserves the original crystallographic structure but leads to a small spread in orientations within individual grains. Initially, most grains develop in-plane tensile stresses, which are partly released during further dealloying. Simultaneously, the feature size of the developing nanoporous structure increases with increasing dealloying time. Finally, microdiffraction experiments on dealloyed micron-sized nanoporous pillars reveal significant surface damage introduced by focused ion beam milling.

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