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Insights into the Exfoliation Process of V2O5 center dot nH(2)O Nanosheet Formation Using Real-Time V-51 NMR
Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden;Alexandria Univ, Fac Sci, Dept Chem, Alexandria 21321, Egypt;Linkoping Univ, Dept Phys Chem & Biol IFM, S-58183 Linkoping, Sweden.ORCID iD: 0000-0003-0358-2379
Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.ORCID iD: 0000-0002-2542-8113
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0002-3049-6831
Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.
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2019 (English)In: ACS OMEGA, ISSN 2470-1343, Vol. 4, no 6, p. 10899-10905Article in journal (Refereed) Published
Abstract [en]

Nanostructured hydrated vanadium oxides (V2O5 center dot nH(2)O) are actively being researched for applications in energy storage, catalysis, and gas sensors. Recently, a one-step exfoliation technique for fabricating V2O5 center dot nH(2)O nano-sheets in aqueous media was reported; however, the underlying mechanism of exfoliation has been challenging to study. Herein, we followed the synthesis of V2O5 center dot nH(2)O nanosheets from the V2O5 and VO2 precursors in real using solution- and solid-state V-51 NMR. Solution-state V-51 NMR showed that the aqueous solution contained mostly the decavanadate anion [H2V10O28](4-) and the hydrated dioxova-nadate cation [VO2 center dot 4H(2)O](+), and during the exfoliation process, decavanadate was formed, while the amount of [VO2 center dot 4H(2)O](+) remained constant. The conversion of the solid precursor V2O5, which was monitored with solid-state V-51 NMR, was initiated when VO2 was in its monoclinic forms. The dried V2O5 center dot nH(2)O nanosheets were weakly paramagnetic because of a minor content of isolated V4+. Its solid-state V-51 signal was less than 20% of V2O5 and arose from diamagnetic V4+ or V5+.This study demonstrates the use of real-time NMR techniques as a powerful analysis tool for the exfoliation of bulk materials into nanosheets. A deeper understanding of this process will pave the way to tailor these important materials.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 4, no 6, p. 10899-10905
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Materials Chemistry
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URN: urn:nbn:se:uu:diva-390643DOI: 10.1021/acsomega.9b00727ISI: 000473361500150OAI: oai:DiVA.org:uu-390643DiVA, id: diva2:1343790
Available from: 2019-08-19 Created: 2019-08-19 Last updated: 2019-08-19Bibliographically approved

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Svedlindh, Peter

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