Type

Journal Article

Authors

Justin D. Holmes
Nikolay Petkov
Michael A. Morris
Sven Barth
Subhajit Biswas
Colm O'Regan

Subjects

Chemistry

Topics
germanium nanowires silver nanowires ternary alloys direct determination germanium equilibrium concentration ternary eutectic alloys heating experiment catalysts film growth size controlled growth gold nanoparticles thermoelectricity gold deposits diameter dependent solute concentrations thin films aspect ratio

Size-controlled growth of germanium nanowires from ternary eutectic alloy catalysts (2014)

Abstract We report the size-controlled growth of Ge nanowires from Au-Ag-Ge ternary alloy catalysts. Significantly, Au-Ag-Ge layered thin films enabled, for the first time, the synthesis of high aspect ratio Ge nanowires by simultaneously manipulating both the solute concentration (C) and equilibrium concentration (Ceq.) of Ge in the catalysts, thereby increasing the Ge supersaturation during vapour-liquid-solid (VLS) growth. Simultaneous manipulation of C and Ceq. to enhance nanowire growth rates was also achieved using colloidal Au0.75-Ag0.25 nanoparticles deposited on a Ge film. These nanoparticles produced Ge nanowires with more uniform diameter distributions than those obtained from the thin films. The manifestation of the Gibbs-Thomson effect, resulting in a diameter dependent growth rate, was observed for all nanowires grown from Au0.75-Ag0.25 nanoparticles. In situ TEM heating experiments performed on the as-grown Ge nanowires enabled direct determination of the Ge equilibrium concentrations in the Au-Ag-Ge ternary alloys.
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Full list of authors on original publication

Justin D. Holmes, Nikolay Petkov, Michael A. Morris, Sven Barth, Subhajit Biswas, Colm O'Regan

Experts in our system

1
Justin D. Holmes
University College Cork
Total Publications: 287
 
2
Nikolay Petkov
University College Cork
Total Publications: 64
 
3
Michael A. Morris
University College Cork
Total Publications: 164
 
4
Sven Barth
University College Cork
Total Publications: 10
 
5
Subhajit Biswas
University College Cork
Total Publications: 43
 
6
Colm O'Regan
University College Cork
Total Publications: 16