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Amorphous interface oxide formed due to high amount of Sm doping (5-20 mol%) stabilizes finer size anatase and lowers indirect band gap

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Show simple item record Zubair, Abdullah Al Mamun, Abdullah McNamara, Karrina Tofail, Syed A.M. Islam, Fakhrul Lebedev, Vasily A. 2020-07-30T09:29:48Z 2020
dc.description peer-reviewed en_US
dc.description The full text of this article will not be available in ULIR until the embargo expires on the 23/06/2022
dc.description.abstract In this study, we have synthesized Ti(1-x)SmxO2 (x = 0–20%) nanocomposites by adopting an aqueous sol-gel route. A two or multi-phase mixture of titania and samarium oxide could be expected as samarium added >5% may exceed its solubility limit in anatase. Surface and high-resolution characterization found Sm forming a predominantly thin amorphous layer that is not discernible in conventional transmission electron microscopy. The addition of Sm in such a high amount stabilizes formation of anatase phase of TiO2. Importantly, we observe that the incorporation of such high amount of Sm in titania leads to a grain growth inhibition of anatase. Sm can also be reduced from a trivalent state to a bivalent state. The addition of Sm thus results in very thin amorphous layer around the nanocrystalline anatase, inhibits the growth of this anatase and lowers the indirect band gap from 3.0 eV to 2.47 eV. That such lowering happens along with a lowering of size and a resulting increase in surface area means that doping of titania by more than 5% Sm can make better a photocatalyst either for the purpose of photodegradation of industrial organic water-pollutants and microorganisms under the visible light irradiation than a pristine anatase. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Applied Surface Science;529, 146967
dc.rights This is the author’s version of a work that was accepted for publication in Applied Surface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Surface Science, 529, 146967, en_US
dc.subject Sm-doped anatase en_US
dc.subject Sol-gel syntesis en_US
dc.subject TiO2 nanoparticle en_US
dc.title Amorphous interface oxide formed due to high amount of Sm doping (5-20 mol%) stabilizes finer size anatase and lowers indirect band gap en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.apsusc.2020.146967
dc.contributor.sponsor Advance Studies and Research (CASR) en_US 2022-06-23
dc.embargo.terms 2022-06-23 en_US
dc.rights.accessrights info:eu-repo/semantics/embargoedAccess en_US

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