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

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

研究成果: Article査読

10 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)181-186
ページ数6
ジャーナルMicroporous and Mesoporous Materials
186
DOI
出版ステータスPublished - 2014 3 1

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学

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