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Evolution of SiOx shell layers on SiC-SiOx core-shell nanowires

Evolution of SiOx shell layers on SiC-SiOx core-shell nanowires

Kategori
Vitenskapelig artikkel
Sammendrag
Composite 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.
Oppdragsgiver
  • Research Council of Norway (RCN) / 269431
Språk
Engelsk
Forfatter(e)
Institusjon(er)
  • Norges teknisk-naturvitenskapelige universitet
  • SINTEF Industri / Metallproduksjon og prosessering
År
Publisert i
Materials Science Forum
ISSN
0255-5476
Forlag
Trans Tech Publications
Årgang
1004
Side(r)
479 - 489