Effects of magnesium and zirconium dopants on characteristics of titanium(IV) oxide fibers prepared by combined Sol-Gel and electrospinning techniques
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Author list: Kaewsaenee J., Visal-Athaphand P., Supaphol P., Pavarajarn V.
Publication year: 2011
Volume number: 50
Issue number: 13
Start page: 8042
End page: 8049
Number of pages: 8
ISSN: 0888-5885
eISSN: 0888-5885
Languages: English-Great Britain (EN-GB)
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Abstract
The sol-gel and electrospinning techniques were combined to produce poly(vinylpyrrolidone) (PVP)/titanium(IV) oxide composite fibers from solutions containing PVP and titanium tetraisopropoxide. Either magnesium nitrate hexahydrate or zirconyl(IV) nitrate hydrate was added to the solutions as a source of magnesium or zirconium dopant, respectively. Upon calcination of the as-spun fibers, metal-doped titania fibers were obtained. The presence of either magnesium or zirconium dopant affected both the physical and chemical properties of the as-synthesized titania fibers and even retarded the formation of the rutile phase. Various characterization techniques were employed to confirm the increased content of Ti3+ defects and oxygen vacancies within the titania structures resulting from the presence of the metal dopants. These defects were found to trap photoexcited charges (i.e., electrons and holes), thus retarding the recombination of electron-hole pairs. This led to an enhancement of the photocatalytic activity of the titania structures. ฉ 2011 American Chemical Society.
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