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Title: One-dimensional carbon-SnO2 and SnO2 nanostructures via single-spinneret electrospinning: Tunable morphology and the underlying mechanism
Authors: Kong, J.
Wong, S.Y.
Zhang, Y. 
Tan, H.R.
Li, X.
Lu, X.
Issue Date: 28-Oct-2011
Citation: Kong, J., Wong, S.Y., Zhang, Y., Tan, H.R., Li, X., Lu, X. (2011-10-28). One-dimensional carbon-SnO2 and SnO2 nanostructures via single-spinneret electrospinning: Tunable morphology and the underlying mechanism. Journal of Materials Chemistry 21 (40) : 15928-15934. ScholarBank@NUS Repository.
Abstract: Carbon-SnO2 hybrid nanofibers with tunable morphology were prepared from polyacrylonitrile (PAN) and tin compounds via single-spinneret electrospinning and subsequent carbonization. Different tin compounds, including tin acetate (Sn(CH3COO)2), tin chloride dihydrate (SnCl2·2H2O), tin sulfate (SnSO4) and tin sulfide (SnS), were chosen as precursors of SnO2 to tune the morphology of carbon-SnO2 nanofibers. Morphology of the obtained nanofibers was studied using a field emission scanning electron microscope (FESEM) and a transmission electron microscope (TEM), and their structures were characterized by thermal gravimetric analysis (TGA) and X-ray diffraction (XRD). A carbon-SnO2 core-shell morphology is formed during carbonization when Sn(CH3COO)2 and SnCl2·2H 2O are used as precursors of SnO2, while uniform distribution of Sn compounds in a carbon matrix is observed with SnSO 4 or SnS as the precursor. Our study demonstrates that the Kirkendall effect, which is responsible for the formation of the core-shell morphology during carbonization, is strongly dependent on melting points and decomposition behaviours of the precursors. SnO2 nanofibers and nanotubes with a high aspect ratio were produced upon burning out carbon, and their morphology is dependent on that of the corresponding hybrid nanofibers. TEM studies show that the SnO2 nanofibers/nanotubes are constituted of SnO2 single crystals, yet the grain size and facet varies with the precursor. The Brunauer-Emmett-Teller (BET) study verifies that the nanofibers/nanotubes have a large surface area, which also varies with the precursors used. © 2011 The Royal Society of Chemistry.
Source Title: Journal of Materials Chemistry
ISSN: 09599428
DOI: 10.1039/c1jm12492g
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