Growth and analysis of the tetragonal (ST12) germanium nanowires

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dc.contributor.authorGarcia-Gil, Adriá
dc.contributor.authorBiswas, Subhajit
dc.contributor.authorRoy, Ahin
dc.contributor.authorSaladukh, Dzianis
dc.contributor.authorRaha, Sreyan
dc.contributor.authorBlon, Thomas
dc.contributor.authorConroy, Michele
dc.contributor.authorNicolosi, Valeria
dc.contributor.authorSingha, Achintya
dc.contributor.authorLacroix, Lise-Marie
dc.contributor.authorHolmes, Justin D.
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2022-02-18T12:50:12Z
dc.date.available2022-02-18T12:50:12Z
dc.date.issued2022-01-17
dc.date.updated2022-02-18T12:32:47Z
dc.description.abstractNew semiconducting materials, such as state-of-the-art alloys, engineered composites and allotropes of well-established materials can demonstrate unique physical properties and generate wide possibilities for a vast range of applications. Here we demonstrate, for the first time, the fabrication of a metastable allotrope of Ge, tetragonal germanium (ST12-Ge), in nanowire form. Nanowires were grown in a solvothermal-like single-pot method using supercritical toluene as a solvent, at moderate temperatures (290–330 °C) and a pressure of ∼48 bar. One-dimensional (1D) nanostructures of ST12-Ge were achieved via a self-seeded vapour–liquid–solid (VLS)-like paradigm, with the aid of an in situ formed amorphous carbonaceous layer. The ST12 phase of Ge nanowires is governed by the formation of this carbonaceous structure on the surface of the nanowires and the creation of Ge–C bonds. The crystalline phase and structure of the ST12-Ge nanowires were confirmed by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy. The nanowires produced displayed a high aspect ratio, with a very narrow mean diameter of 9.0 ± 1.4 nm, and lengths beyond 4 μm. The ST12-Ge nanowire allotrope was found to have a profound effect on the intensity of the light emission and the directness of the bandgap, as confirmed by a temperature-dependent photoluminescence study.en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationGarcia-Gil, A., Biswas, S., Roy, A., Saladukh, D., Raha, S., Blon, T., Conroy, M., Nicolosi, V., Singha, A., Lacroix, L.-M. and Holmes, J. D. (2022) 'Growth and analysis of the tetragonal (ST12) germanium nanowires', Nanoscale, 14(5), pp. 2030-2040. doi: 10.1039/d1nr07669hen
dc.identifier.doi10.1039/d1nr07669hen
dc.identifier.eissn2040-3372
dc.identifier.endpage2040en
dc.identifier.issn2040-3364
dc.identifier.issued5en
dc.identifier.journaltitleNanoscaleen
dc.identifier.startpage2030en
dc.identifier.urihttps://hdl.handle.net/10468/12581
dc.identifier.volume14en
dc.language.isoenen
dc.publisherRoyal Society of Chemistryen
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.rights© 2022, the Authors. Published by the Royal Society of Chemistry.en
dc.subjectTetragonal (ST12) germanium nanowiresen
dc.titleGrowth and analysis of the tetragonal (ST12) germanium nanowiresen
dc.typeArticle (peer-reviewed)en
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