Formation of nanoporous Au by dealloying AuCu thin films in HNO3

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

Research output: Contribution to journalArticlepeer-review

72 Scopus citations


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
Issue number9
StatePublished - May 2011
Externally publishedYes


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

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys


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