期刊
APPLIED PHYSICS LETTERS
卷 103, 期 20, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4831686
关键词
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资金
- National Basic Research Program of China [2012CB932202]
- National Natural Science Foundation of China [51171183, 51222105]
We have investigated the mechanical stability of nanoporous gold (npg) in an electrochemical environment, using in situ dilatometry and compression experiments. It is demonstrated that the gold nano-ligaments creep under the action of surface stress which leads to spontaneous volume contractions in macroscopic npg samples. The creep of npg, under or without external forces, can be controlled electrochemically. The creep rate increases with increasing potential in double-layer potential region, and deceases to almost zero when the gold surface is adsorbed with oxygen. Surprisingly, we also noticed a correlation between creep and surface diffusivity, which links the deformation of nanocrystals to mobility of surface atoms. (C) 2013 AIP Publishing LLC.
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