Type

Journal Article

Authors

Justin D. Holmes
Colm O'Dwyer
Achintya Singha
Colm O'Regan
Sreyan Raha
Clive Downing
David McNulty
Subhajit Biswas
Jessica Doherty

Subjects

Physics

Topics
branched nanostructure li ion battery germanium tin crystal structure x ray fabrication high resolution nanowires

One-step fabrication of GeSn branched nanowires (2019)

Abstract We report for the first time the self-catalyzed, single-step growth of branched GeSn nanostructures by a vapor–liquid–solid mechanism. These typical GeSn nanostructures consist of ⟨111⟩-oriented, Sn-rich (∼8 atom %) GeSn “branches” grown epitaxially on GeSn “trunks”, with a Sn content of ∼4 atom %. The trunks were seeded from Au0.80Ag0.20 nanoparticles followed by the catalytic growth of secondary branches (diameter ∼ 50 nm) from the excess of Sn on the sidewalls of the trunks, as determined by high-resolution electron microscopy and energy-dispersive X-ray analysis. The nanowires, with ⟨111⟩-directed GeSn branches oriented at ∼70° to the trunks, have no apparent defects or change in crystal structure at the trunk–branch interface; structural quality is retained at the interface with epitaxial crystallographic relation. The electrochemical performance of these highly ordered GeSn nanostructures was explored as a potential anode material for Li-ion batteries, due to their high surface-to-volume ratio and increased charge carrier pathways. The unique structure of the branched nanowires led to high specific capacities comparable to, or greater than, those of conventional Ge nanowire anode materials and Ge1–xSnx nanocrystals.
Collections Ireland -> University College Cork -> College of Science, Engineering and Food Science
Ireland -> University College Cork -> Tyndall National Institute
Ireland -> University College Cork -> Environmental Research Institute - Journal Articles
Ireland -> University College Cork -> Tyndall National Institute - Journal Articles
Ireland -> University College Cork -> Environmental Research Institute
Ireland -> University College Cork -> Chemistry
Ireland -> University College Cork -> Chemistry - Journal Articles
Ireland -> University College Cork -> Research Institutes and Centres

Full list of authors on original publication

Justin D. Holmes, Colm O'Dwyer, Achintya Singha, Colm O'Regan, Sreyan Raha, Clive Downing, David McNulty, Subhajit Biswas, Jessica Doherty

Experts in our system

1
Justin D. Holmes
University College Cork
Total Publications: 287
 
2
Colm O'Dwyer
University College Cork
Total Publications: 239
 
3
Achintya Singha
University College Cork
Total Publications: 8
 
4
Colm O'Regan
University College Cork
Total Publications: 16
 
5
Clive Downing
Trinity College Dublin
Total Publications: 11
 
6
David McNulty
University College Cork
Total Publications: 42
 
7
Subhajit Biswas
University College Cork
Total Publications: 43
 
8
Jessica Doherty
University College Cork
Total Publications: 12