Dealloying of gold-copper alloy nanowires: From hillocks to ring-shaped nanopores.
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.
Institut des Matériaux Jean Rouxel, IMN, Université de Nantes, CNRS, 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France.
Adrien
A
Chauvin
CEISAM, Université de Nantes, CNRS, 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France.
Cyril
C
Delacôte
CEISAM, Université de Nantes, CNRS, 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France.
Mohammed
M
Boujtita
Institut des Matériaux Jean Rouxel, IMN, Université de Nantes, CNRS, 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France.
Benoit
B
Angleraud
Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA.
Junjun
J
Ding
Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA.
Chang-Hwan
CH
Choi
Institut des Matériaux Jean Rouxel, IMN, Université de Nantes, CNRS, 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France.
Pierre-Yves
PY
Tessier
Institut des Matériaux Jean Rouxel, IMN, Université de Nantes, CNRS, 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France.
Abdel-Aziz
AA
El Mel
copper; dealloying; gold; hillocks; nanoporous