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Surface Enrichment in Au–Ag Alloy Nanowires and Investigation of the Dealloying Process

Burr, Loïc and Schubert, Ina and Sigle, Wilfried and Trautmann, Christina and Toimil-Molares, Maria Eugenia (2015):
Surface Enrichment in Au–Ag Alloy Nanowires and Investigation of the Dealloying Process.
119, In: The Journal of Physical Chemistry C, (36), ACS Publications, pp. 20949-20956, ISSN 1932-7447, [Online-Edition: http://dx.doi.org/10.1021/acs.jpcc.5b05596],
[Article]

Abstract

The fabrication of nanowires by electrodeposition of Au−Ag alloy into the pores of etched ion track polymer membrane is presented. The crystallinity, morphology, and composition of wires with diameters of 85, 45, and 30 nm are investigated by means of X-ray diffraction, high-resolution scanning transmission electron microscopy, and energy-dispersive X-ray analysis. Energy-dispersive X-ray analysis with very high spatial resolution (below 1 nm) reveals the presence of surface enrichment. A Ag-rich layer in Au40Ag60 wires and a Au-rich layer in Au60Ag40 wires with thicknesses between 1 and 4 nm are observed. After dealloying in nitric acid, Ag-rich wires exhibit porous morphologies whereas Au-rich wires remain solid cylinders. The results clearly indicate that the analyzed AuAg alloy nanowires do not consist of homogeneous solid solution, but surface effects before and during the dealloying play an important role for the final morphology of dealloyed nanowires.

Item Type: Article
Erschienen: 2015
Creators: Burr, Loïc and Schubert, Ina and Sigle, Wilfried and Trautmann, Christina and Toimil-Molares, Maria Eugenia
Title: Surface Enrichment in Au–Ag Alloy Nanowires and Investigation of the Dealloying Process
Language: English
Abstract:

The fabrication of nanowires by electrodeposition of Au−Ag alloy into the pores of etched ion track polymer membrane is presented. The crystallinity, morphology, and composition of wires with diameters of 85, 45, and 30 nm are investigated by means of X-ray diffraction, high-resolution scanning transmission electron microscopy, and energy-dispersive X-ray analysis. Energy-dispersive X-ray analysis with very high spatial resolution (below 1 nm) reveals the presence of surface enrichment. A Ag-rich layer in Au40Ag60 wires and a Au-rich layer in Au60Ag40 wires with thicknesses between 1 and 4 nm are observed. After dealloying in nitric acid, Ag-rich wires exhibit porous morphologies whereas Au-rich wires remain solid cylinders. The results clearly indicate that the analyzed AuAg alloy nanowires do not consist of homogeneous solid solution, but surface effects before and during the dealloying play an important role for the final morphology of dealloyed nanowires.

Journal or Publication Title: The Journal of Physical Chemistry C
Volume: 119
Number: 36
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 29 Feb 2016 12:44
Official URL: http://dx.doi.org/10.1021/acs.jpcc.5b05596
Identification Number: doi:10.1021/acs.jpcc.5b05596
Funders: L.B. appreciates financial support from HGS-Hire for FAIR.
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