Dependency of the formation of Au-stabilized nanoporous copper on the dealloying temperature

作者：Dan Zhenhua^*; Qin Fengxiang; Sugawara Yu; Muto Izumi; Hara Nobuyoshi

来源：Microporous and Mesoporous Materials, 2014, 186: 181-186.

DOI：10.1016/j.micromeso.2013.12.003

• Amorphous alloys
• Dealloying
• Nanoporous copper
• Surface diffusivity
• Gold addition

Au-stabilized nanoporous Cu with a pore size of 7-24 nm was fabricated through the dealloying of amorphous Ti60Cu40-xAux alloys (x = 1, 2 at%) in HF solutions at 298, 323 and 348 K. Nanoporous structures with larger sizes of bi-continuous pore-to-ligament were obtained at higher temperatures. The residue was confirmed to be crystalline fcc Au and a Cu-Au solid solution. The surface diffusivity of Cu adatoms decreased more than 4 orders of magnitude due to the involvement of Au atoms as the temperature decreased. The surface diffusivity had a linear dependence on the reciprocal of the temperature, in accordance with the Arrhenius law. The activation energy of surface diffusion for amorphous TiCuAu alloys was estimated to be 56.1-62.7 kJ mol(-1), which was independent of the Au content and the concentration of the HF solutions.

• 出版日期2014-3-1