Fabrication of nanoporous copper by dealloying amorphous binary Ti-Cu alloys in hydrofluoric acid solutions

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

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

A nanoporous copper structure was fabricated from amorphous binary Ti xCu 100-x (x = 30, 40, 50 and 60 at.%) alloys in hydrofluoric acid solutions under a free corrosion condition. The great difference in the standard electrode potentials of Ti/Ti 2+ and Cu/Cu 2+ pairs and the uniformity in microstructure promise the formation of a nanoporous structure of copper. A bicontinuous nanoporous structure from tenths of nanometers to hundredths of nanometers was formed by dealloying less noble titanium element, depending on alloy composition, solution concentration and treatment time. Hydrofluoric acid effectively dissolved the native TiO 2 layer. The fluoride ions were found to react selectively with Ti to form a soluble species and thus played a key role in the process.

Original languageEnglish
Pages (from-to)14-20
Number of pages7
JournalIntermetallics
Volume29
DOIs
Publication statusPublished - 2012 Oct 1

Keywords

  • B. Corrosion
  • B. Glasses, metallic
  • C. Rapid solidification processing

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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