One-step fabrication of GeSn branched nanowires

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dc.contributor.authorDoherty, Jessica
dc.contributor.authorBiswas, Subhajit
dc.contributor.authorMcNulty, David
dc.contributor.authorDowning, Clive
dc.contributor.authorRaha, Sreyan
dc.contributor.authorO'Regan, Colm
dc.contributor.authorSingha, Achintya
dc.contributor.authorO'Dwyer, Colm
dc.contributor.authorHolmes, Justin D.
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderIrish Research Councilen
dc.date.accessioned2019-06-12T15:02:28Z
dc.date.available2019-06-12T15:02:28Z
dc.date.issued2019-05-22
dc.date.updated2019-06-11T16:42:42Z
dc.description.abstractWe 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.en
dc.description.sponsorshipIrish Research Council (Postgraduate Scholarship (Grant No: GOIPG/2015/2772))en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationerty, J., Biswas, S., McNulty, D., Downing, C., Raha, S., O’Regan, C., Singha, A., O’Dwyer, C. and Holmes, J. D. (2019) 'One-Step Fabrication of GeSn Branched Nanowires', Chemistry of Materials, 31(11), pp. 4016-4024. doi: 10.1021/acs.chemmater.9b00475en
dc.identifier.doi10.1021/acs.chemmater.9b00475en
dc.identifier.eissn1520-5002
dc.identifier.endpage4024en
dc.identifier.issn0897-4756
dc.identifier.issued11en
dc.identifier.journaltitleChemistry of Materialsen
dc.identifier.startpage4016en
dc.identifier.urihttps://hdl.handle.net/10468/8052
dc.identifier.volume31en
dc.language.isoenen
dc.publisherAmerican Chemical Society, ACSen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Investigator Programme/14/IA/2513/IE/Silicon Compatible, Direct Band-Gap Nanowire Materials For Beyond-CMOS Devices/en
dc.relation.urihttps://pubs.acs.org/doi/full/10.1021/acs.chemmater.9b00475?ai=6650
dc.rights© 2019 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.chemmater.9b00475en
dc.subjectNanowiresen
dc.subjectGermanium-tinen
dc.subjectBranched nanostructureen
dc.subjectLi-ion batteryen
dc.titleOne-step fabrication of GeSn branched nanowiresen
dc.typeArticle (peer-reviewed)en
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