Journal
PHYSICAL REVIEW B
Volume 85, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.195419
Keywords
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Funding
- US Department of Energy (DOE) [DE-FG02-03ER15476]
- Synchrotron Catalysis Consortium (US DOE) [DE-FG02-05ER15688]
- Catalysis Center for Energy Innovation, an Energy Frontier Research Center
- US DOE, Office of Science, Office of Basic Energy Sciences [DE-SC00010004]
- JST-PRESTO
- Sekisui Research Foundation
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We measured the thermal expansion coefficient and Debye temperature of nanoporous gold (NPG) using the extended x-ray absorption fine structure technique. Reduction of the nearest-neighbor distances in NPG by ca. 0.01 angstrom compared to the bulk gold was attributed to the surface tension caused, in turn, by the finite-size effect of the NPG ligaments. We also demonstrated that the Debye temperature in NPG is 5% lower than in bulk gold. We interpreted these observations in the framework of a bimodal distribution of surface and bulk bonds with different values of Debye temperature. The surface bonds with low Debye temperature extend within ca. four layers of Au atoms located on the pore surface, in a good agreement with prior resistivity measurements and theoretical predictions.
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