Electrochemical control of creep in nanoporous gold
Electrochemical control of creep in nanoporous gold
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DOI：
10.1063/1.4831686
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发表时间：
2013-11
影响因子：
4
通讯作者：
X. Ye;H. Jin
中科院分区：
文献类型：
--
作者：
X. Ye;H. Jin
利用原位膨胀和压缩实验研究了纳米孔金（npg）在电化学环境下的机械稳定性。结果表明，纳米金韧带在表面应力作用下发生蠕变，导致宏观npg试样的体积自发收缩。在外力作用下或无外力作用下，npg的蠕变可以用电化学方法控制。在双层电位区，蠕变速率随电位的增大而增大，当金表面被氧吸附时，蠕变速率几乎为零。令人惊讶的是，我们还注意到蠕变和表面扩散率之间的相关性，这将纳米晶体的变形与表面原子的迁移率联系起来。
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.