Formation of nanoporous Au by dealloying AuCu thin films in HNO3

R. Morrish, K. Dorame, A. J. Muscat

Research output: Contribution to journalArticle

51 Scopus citations

Abstract

AuCu thin films were dealloyed in concentrated HNO3 solution at temperatures of 5-35 °C. X-ray diffraction and scanning electron microscopy analysis showed that interior grain regions undergo partial Cu dissolution before being assimilated into a ligament/void network that was initiated at grain boundaries. The compressive stress generated by removal of the smaller Cu atom yielded an activation energy for ligament growth of 25.4 ± 2.37 kJ mol-1, which is less than half that reported for AgAu alloys.

Original languageEnglish (US)
Pages (from-to)856-859
Number of pages4
JournalScripta Materialia
Volume64
Issue number9
DOIs
StatePublished - May 1 2011

Keywords

  • Dealloy
  • Nanostructured material
  • Porous material
  • Surface diffusion
  • Thin films

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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