Dealloying of gold-copper alloy nanowires: From hillocks to ring-shaped nanopores

Adrien Chauvin, Cyril Delacôte, Mohammed Boujtita, Benoit Angleraud, Junjun Ding, Chang Hwan Choi, Pierre Yves Tessier, Abdel Aziz El Mel

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We report on a novel fabrication approach of metal nanowires with complex surface. Taking advantage of nodular growth triggered by the presence of surface defects created intentionally on the substrate as well as the high tilt angle between the magnetron source axis and the normal to the substrate, metal nanowires containing hillocks emerging out of the surface can be created. The approach is demonstrated for several metals and alloys including gold, copper, silver, gold-copper and gold-silver. We demonstrate that applying an electrochemical dealloying process to the gold-copper alloy nanowire arrays allows for transforming the hillocks into ring-like shaped nanopores. The resulting porous gold nanowires exhibit a very high roughness and high specific surface making of them a promising candidate for the development of SERS-based sensors.

Original languageEnglish
Pages (from-to)1361-1367
Number of pages7
JournalBeilstein Journal of Nanotechnology
Volume7
Issue number1
DOIs
StatePublished - 2016

Keywords

  • Copper
  • Dealloying
  • Gold
  • Hillocks
  • Nanoporous

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