Dependency of the formation of Au-stabilized nanoporous copper on the dealloying temperature
Dependency of the formation of Au-stabilized nanoporous copper on the dealloying temperature
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DOI：
10.1016/j.micromeso.2013.12.003
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发表时间：
2014-03
影响因子：
5.2
通讯作者：
Z. Dan;F. Qin;Y. Sugawara;I. Muto;N. Hara
中科院分区：
文献类型：
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作者：
Z. Dan;F. Qin;Y. Sugawara;I. Muto;N. Hara
在298、323和348 K的HF溶液中，通过非晶态Ti 60 Cu 40 − xAl 2 O3合金（x= 1，2at%）的脱合金化制备了Au稳定的纳米多孔Cu，孔径为7-24 nm。在较高的温度下，获得了具有较大尺寸的双连续孔-韧带的纳米孔结构。确认残留物是堆叠的efccAu和Cu-Au固溶体。随着温度的降低，由于Au原子的参与，Cu吸附原子的表面扩散系数降低了4个数量级以上。表面扩散系数与温度的倒数呈线性关系，符合阿克里尼乌斯定律。非晶态TiCu Au合金的表面扩散活化能估计为56.1-62.7 kJ mol−1，这与Au含量和HF溶液的浓度无关。
Au-stabilized nanoporous Cu with a pore size of 7–24 nm was fabricated through the dealloying of amorphous Ti60Cu40−xAuxalloys (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 crystallinefccAu 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.