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dc.contributor.authorBroggi, Andrea
dc.contributor.authorRingdalen, Eli
dc.contributor.authorTangstad, Merete
dc.identifier.citationMaterials Science Forum. 2020, .en_US
dc.description.abstractComposite core-shell SiC-SiOx nanowires can be produced by heating quartz and SiC powders, with addition of Ar(g) or He(g). The two powders are mixed to create pellets, which will react to SiO(g) and CO(g) at elevated temperatures. The two gases will react on a colder surface, producing a web of nanowires. The product serves as a precursor for SiC nanowires production. During the process, silicon and oxygen accumulate at high energy surface points, forming SiOx nodules. They can either generate in proximity of stacking faults, or where two or more nanowires are close to each other. The present work investigates the role of crystal defects in the wettability between silica and silicon carbide. Samples were collected and analyzed under Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The results show that β-SiC grows mainly in the [111] direction. Crystal defects are located in the SiC core-phase. SiOx initially develops a uniform layer as thick as the core-phase itself. SiOx nodules would first form where the defects are present, by accumulating at high energy sites. Droplets on a flat surface imply poor wettability. The mechanism of formation of the nodules is compared to two earlier proposed theories. In conclusion, the wettability of SiOx and SiC at nanoscale is controlled by the presence of crystallographic defects and the relative amounts of SiC and SiOx.en_US
dc.publisherPublished by Trans Tech Publications Ltd, Switzerlanden_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectsilicon suboxideen_US
dc.subjectmelting-point depressionen_US
dc.subjectmechanism of formationen_US
dc.titleEvolution of SiOx shell layers on SiC-SiOx core-shell nanowiresen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder© 2020 The Author(s). Published by Trans Tech Publications Ltd, Switzerlanden_US
dc.source.journalMaterials Science Forumen_US
dc.relation.projectNorges forskningsråd: 269431en_US

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal