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Title: Wire or no wire : depends on the catalyst layer thickness
Authors: Zhao, Dongliang
Li, Fengji
Zhang, Sam
Lee, Jyh-Wei
Keywords: DRNTU::Engineering::Materials::Mechanical strength of materials
Issue Date: 2013
Source: Li, F. J., Zhang, S., Lee, J. W.,& Zhao, D. (2013). Wire or no wire—Depends on the catalyst layer thickness. Journal of crystal growth, 381, 87-92.
Series/Report no.: Journal of crystal growth
Abstract: Crystalline silicon (Si) nanowire could be directly grown from Si wafer upon thermal annealing in the presence of catalyst such as gold (Au). However, the role of the catalyst layer thickness is yet elucidated. In this work, 10 nm, 20 nm, and 40 nm Au layers were respectively sputtered on Si wafer substrates, followed by 2 min thermal annealing at 1000 °C under Ar atmosphere, to find the relationship between the catalyst layer thickness and formation of the nanowire. Results show that in the case of thin layer of catalyst, crystalline-Si/amorphous-SiOx coaxial nanowires grew. But with thicker layers of catalyst, no wires were found but crystalline Au particles capsulated with amorphous SiOx. The catalyst and nanowire morphologies and structures were carefully examined through a scanning electron microscope, X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy and selected area diffraction. A model is developed to explain the formation mechanism of the Si/SiOx and Au/SiOx core–shell nanostructures.
ISSN: 0022-0248
DOI: 10.1016/j.jcrysgro.2013.07.010
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles

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