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Issue 25, 2009
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VO2(B) nanorods: solvothermal preparation, electrical properties, and conversion to rutile VO2 and V2O3

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Abstract

The solvothermal reduction of V2O5 by formaldehyde or isopropanol yields nanorods of the metastable, monoclinic VO2(B) phase. The structural transition in VO2(B), which occurs near room temperature, has been monitored using electrical resistivity measurements, performed both on pressed pellets of the nanorods as well as on nanorods dispersed on patterned contacts. A sudden, 105 increase in the electrical resistivity upon cooling below 290 K is seen in measurements on VO2(B) samples. Such a transition in the electrical resistivity has not previously been reported in this material. The transition is reminiscent of the metal-to-insulator transition observed in the case of pressed pellets of polycrystalline rutile VO2 upon cooling below 340 K. The metastable VO2(B) nanorods are converted to rutile VO2 by heating in argon, and to corundum V2O3 by reducing in 5%H2 : 95%N2. In both transformations, the structural integrity of the nanorods is compromised, with large, dense, rutile VO2 crystallites and less well-defined nanorods of V2O3 being formed.

Graphical abstract: VO2(B) nanorods: solvothermal preparation, electrical properties, and conversion to rutile VO2 and V2O3

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Publication details

The article was received on 19 Jan 2009, accepted on 04 Mar 2009 and first published on 31 Mar 2009


Article type: Paper
DOI: 10.1039/B900982E
Citation: J. Mater. Chem., 2009,19, 4362-4367

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    VO2(B) nanorods: solvothermal preparation, electrical properties, and conversion to rutile VO2 and V2O3

    S. A. Corr, M. Grossman, Y. Shi, K. R. Heier, G. D. Stucky and R. Seshadri, J. Mater. Chem., 2009, 19, 4362
    DOI: 10.1039/B900982E

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