Elaboration of nanoporous copper by modifying surface diffusivity by the minor addition of gold

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

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30 Citations (Scopus)


The basic concept of alloying was combined with modifications of the surface diffusivity through the addition of trace metals with low surface diffusivity in order to elaborate the dealloyed nanoporous metals. Nanoporous Cu with a pore size less than 10 nm was able to be elaborated. This nanoporous Cu was fabricated through dealloying from amorphous Ti 60Cu 40-xAu x (x = 0, 1, 2 at.%) ribbon alloys under free immersion conditions. A bicontinuous nanoporous Cu structure formed on Ti 60Cu 40, Ti 60Cu 39Au 1, and Ti 60Cu 38Au 2 ribbon alloys with pore sizes of 140, 19, and 9 nm, respectively, in 0.13 M HF solution. The pore size of the nanoporous Cu dealloyed from Au-added alloys was more than one order smaller than that of the Ti-Cu alloy. The pore size depended not only on the treatment solutions and treatment time but also on the alloy compositions. The uniform distribution of an Au additive on Cu in effect modified the surface diffusivity, resulting in the formation of an ultrafine nanoporous structure. The surface diffusivity was estimated to decrease from 2.49 × 10 -17 to 5.88 × 10 -22 m 2 s -1 by adding 2 at.% Au to Ti 60Cu 40 ribbons.

Original languageEnglish
Pages (from-to)257-264
Number of pages8
JournalMicroporous and Mesoporous Materials
Publication statusPublished - 2013 Jan 1


  • Amorphous alloy
  • Dealloying
  • Diffusion mechanism
  • Gold addition
  • Nanoporous copper


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