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Monolithic nanocrystalline Au fabricated by the compaction of nanoscale foam.
- Source :
- Journal of Materials Research; Mar2005, Vol. 20 Issue 3, p554-557, 4p, 2 Black and White Photographs, 1 Chart
- Publication Year :
- 2005
-
Abstract
- We describe a two-step dealloying/compaction process to produce nanocrystalline Au. First, nanocrystalline/nanoporous Au foam was synthesized by electrochemically driven dealloying. The resulting Au foams exhibited porosities of ∼60% with pore sizes of 40 and 100 nm and a typical grain size of <50 nm. Second, the nanoporous foams were fully compacted to produce nanocrystalline monolithic Au. The compacted Au was characterized by transmission electron microscopy and x-ray diffraction and tested by depth-sensing nanoindentation. The compacted nanocrystalline Au exhibited an average grain size of <50 nm and hardness values ranging from 1.4 to 2.0 GPa, which were up to 4.5 times higher than the hardness values obtained from polycrystalline Au. [ABSTRACT FROM AUTHOR]
- Subjects :
- COMPACTING
CRYSTALS
NANOSTRUCTURED materials
NANOTECHNOLOGY
GOLD
Subjects
Details
- Language :
- English
- ISSN :
- 08842914
- Volume :
- 20
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Journal of Materials Research
- Publication Type :
- Academic Journal
- Accession number :
- 16561551
- Full Text :
- https://doi.org/10.1557/JMR.2005.0081