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Monolithic nanocrystalline Au fabricated by the compaction of nanoscale foam

Published online by Cambridge University Press:  01 March 2005

A.M. Hodge ,
J. Biener ,
L.L. Hsiung ,
Y.M. Wang ,
A.V. Hamza  and
J.H. Satcher Jr.
A.M. Hodge*
Affiliation:
Nanoscale Synthesis and Characterization Laboratory, Materials Science and Technology Division, Lawrence Livermore National Laboratory, Livermore, California 94550
J. Biener
Affiliation:
Nanoscale Synthesis and Characterization Laboratory, Materials Science and Technology Division, Lawrence Livermore National Laboratory, Livermore, California 94550
L.L. Hsiung
Affiliation:
Nanoscale Synthesis and Characterization Laboratory, Materials Science and Technology Division, Lawrence Livermore National Laboratory, Livermore, California 94550
Y.M. Wang
Affiliation:
Nanoscale Synthesis and Characterization Laboratory, Materials Science and Technology Division, Lawrence Livermore National Laboratory, Livermore, California 94550
A.V. Hamza
Affiliation:
Nanoscale Synthesis and Characterization Laboratory, Materials Science and Technology Division, Lawrence Livermore National Laboratory, Livermore, California 94550
J.H. Satcher Jr.
Affiliation:
Nanoscale Synthesis and Characterization Laboratory, Materials Science and Technology Division, Lawrence Livermore National Laboratory, Livermore, California 94550
*
a)Address all correspondence to this author. e-mail: hodge4@llnl.gov
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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.

Keywords

DensificationNanoindentationNanoscale
Type
Rapid Communications
Information
Journal of Materials Research , Volume 20 , Issue 3 , March 2005 , pp. 554 - 557
Copyright
Copyright © Materials Research Society 2005

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