Hydrothermal synthesis and controlled growth of vanadium oxide nanocrystals

0-, 1- and 2-dimensional nanocrystals of different vanadium oxides were synthesized using hydrothermal reaction of commercial bulk monoclinic VO sub(2) and V sub(2)O sub(3) precursor, which, depending on reaction conditions, produced nanoparticles, nanoribbons and nanosheets of different vanadium ox...

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Bibliographic Details
Published in:CrystEngComm 2013-01, Vol.15 (33), p.6617-6624
Main Authors: Minic, Dragica M, Blagojevic, Vladimir A
Format: Article
Language:English
Subjects:
Nanocomposites
Nanocrystals
Nanomaterials
Nanoparticles
Nanostructure
Precursors
Vanadium oxides
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Summary:0-, 1- and 2-dimensional nanocrystals of different vanadium oxides were synthesized using hydrothermal reaction of commercial bulk monoclinic VO sub(2) and V sub(2)O sub(3) precursor, which, depending on reaction conditions, produced nanoparticles, nanoribbons and nanosheets of different vanadium oxides. Addition of acetone was used to direct growth and produce two-dimensional nanosheets, whose aspect ratio depends on acetone-to-precursor concentration, while addition of different alcohols as ligands successfully controlled the nanoribbon size. Variation of pH also changes the product dimensionality, allowing production of nanosheets at pH < 3, nanoribbons at 3 < pH < 7 and, through inhibition of reaction, nanoparticles at high pH. Products of different morphology exhibit systematic increase in unit cell volume with decrease in thickness of nanocrystals. The reaction occurs with VO super(2+) ion as the primary reactant, requiring only a source of VO super(2+) ions, and not necessarily crystalline VO sub(2)(M), allowing use of other precursors, like VOSO sub(4). Calculations indicate that nanoribbon formation is primarily caused by differences in relative stability of individual crystal planes of VO sub(2). Addition of different amounts of hydrogen peroxide changes the oxidation state of vanadium to produce V sub(3)O sub(7) and V sub(2)O sub(5), without affecting the product morphology, while use of bulk V sub(2)O sub(3) as a precursor leads to the formation of V sub(2)O sub(3) nanoribbons, nanoleaves and nanoparticles with similar mechanisms of size and shape control.
ISSN:1466-8033
1466-8033
DOI:10.1039/c3ce40830b