On the microstructure of nanoporous gold: an X-ray diffraction study.
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.
Van Petegem
Steven
S
Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
Brandstetter
Stefan
S
Hodge
Andrea M
AM
El-Dasher
Bassem S
BS
Biener
Jurgen
J
Schmitt
Bernd
B
Borca
Camelia
C
Van Swygenhoven
Helena
H