Size dependent thermal properties of embedded crystalline germanium nanowires

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dc.contributor.authorAudoit, Guillaume
dc.contributor.authorKulkarni, Jaideep S.
dc.contributor.authorMorris, Michael A.
dc.contributor.authorHolmes, Justin D.
dc.contributor.funderIrish Research Council for Science, Engineering and Technologyen
dc.date.accessioned2019-07-11T11:57:06Z
dc.date.available2019-07-11T11:57:06Z
dc.date.issued2007-01-31
dc.date.updated2019-06-28T16:25:46Z
dc.description.abstractHere we report the size-dependent melting points of crystalline germanium nanowires confined within the pores of hexagonal mesoporous silica templates. A supercritical fluid deposition technique was used to form the nanowire–template composite materials and differential thermal analysis, coupled to thermal gravimetric analysis, was used to determine the melting points of the embedded Ge nanowires with mean diameters ranging from 22 to 85 Å. The melting points of the Ge nanowires within the templates were found to be higher than the melting point of bulk germanium (937 °C), typically by 60 °C, and with a broad melting range (∼80 °C). Extended X-ray absorption fine structure (EXAFS) analysis of the Ge K-edge from the nanocomposite materials revealed a linear increase in the Ge–Ge nearest neighbour distance with decreasing nanowire diameter over the size range investigated. In all cases the Ge–Ge first shell distance in the nanowires was greater than in the bulk. This observed lattice expansion can be attributed to crystallographic deformation resulting from the strain imposed on the nanowires by the template. EXAFS studies also revealed an increase in the average number of oxygen atoms at the Ge/silica interface with decreasing diameter due to the increasing surface area. Interfacial effects and interactions at the nanowires/matrix interface are believed to delay the melting point of these systems.en
dc.description.sponsorshipIrish Research Council for Science, Engineering and Technology (IRCSET Project SC/02/4)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationAudoit, G., Kulkarni, J. S., Morris, M. A. and Holmes, J. D. (2007) 'Size dependent thermal properties of embedded crystalline germanium nanowires', Journal of Materials Chemistry, 17(16), pp. 1608-1613. doi: 10.1039/B616216Aen
dc.identifier.doi10.1039/B616216Aen
dc.identifier.endpage1613en
dc.identifier.issn0959-9428
dc.identifier.issued16en
dc.identifier.journaltitleJournal of Materials Chemistryen
dc.identifier.startpage1608en
dc.identifier.urihttps://hdl.handle.net/10468/8141
dc.identifier.volume17en
dc.language.isoenen
dc.publisherRoyal Society of Chemistry (RSC)en
dc.relation.urihttps://pubs.rsc.org/en/content/articlepdf/2007/jm/b616216a
dc.rights© The Royal Society of Chemistry 2007en
dc.subjectNanowiresen
dc.subjectCrystalline materialsen
dc.subjectGermaniumen
dc.subjectMelting pointen
dc.subjectSize determinationen
dc.subjectSupercritical fluidsen
dc.subjectThermodynamic propertiesen
dc.subjectThermogravimetric analysisen
dc.subjectCrystalline germanium nanowiresen
dc.subjectMesoporous silica templatesen
dc.subjectSize dependent thermal propertiesen
dc.titleSize dependent thermal properties of embedded crystalline germanium nanowiresen
dc.typeArticle (peer-reviewed)en
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