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Issue 19, 2009
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VO2nanosheets exhibiting a well-defined metal–insulator phase transition

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Abstract

The ultrafast first-order metal–insulator phase transition in VO2 is characterized by a several orders of magnitude change in optical transmittance and electrical conductivity, which makes this material an attractive candidate for use in a wide variety of applications ranging from Mott field-effect transistors to thermochromic coatings and optical waveguides. However, relatively little progress has been achieved in fabricating VO2nanostructures exhibiting a well-defined metal–insulator transition despite the potential attractiveness of such structures as building blocks for novel nanoscale electronic devices. Herein, we present a solution-based approach for the synthesis of monoclinic single-crystalline VO2nanosheets exhibiting a well-defined metal–insulator phase transition by combining the facile hydrothermal reduction of V2O5, an inexpensive and abundant precursor, with an annealing process. The controlled hydrothermal reduction of bulk V2O5 using small molecule aliphatic alcohols and ketones as reducing agents yields metastable nanostructures of VO2(B) that can be readily transformed to monoclinic VO2 exhibiting a sharp metal–insulator phase transition via an annealing process. The morphology and size of the obtained VO2nanostructures are found to depend on the reaction time and concentration of the added structure-directing agent, providing substantial insight into the nanowire formation process.

Graphical abstract: VO2nanosheets exhibiting a well-defined metal–insulator phase transition

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Publication details

The article was received on 05 Jan 2009, accepted on 20 Feb 2009 and first published on 31 Mar 2009


Article type: Paper
DOI: 10.1039/B823332B
Citation: J. Mater. Chem., 2009,19, 2968-2974
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    VO2nanosheets exhibiting a well-defined metal–insulator phase transition

    L. Whittaker, H. Zhang and S. Banerjee, J. Mater. Chem., 2009, 19, 2968
    DOI: 10.1039/B823332B

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