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

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)181-186
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume186
DOIs
Publication statusPublished - 2014 Mar 1

Keywords

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

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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