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Issue 10, 2011
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Vertical ZnO nanowires/graphene hybrids for transparent and flexible field emission

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Abstract

We present a transparent and flexible optoelectronic material composed of vertically aligned ZnO NWs grown on reduced graphene/PDMS substrates. Large-area reduced graphene films were prepared on PDMS substrates by chemical exfoliation from natural graphitevia oxidative aqueous dispersion and subsequent thermal reduction. ZnO NWs were hydrothermally grown on the reduced graphene film substrate and maintained their structural uniformity even in highly deformed states. The electrical contact between semiconducting ZnO NWs and the metallic graphene film was straightforwardly measured by electric force microscopy (EFM). It shows a typical metal–semiconductor ohmic contact without a contact barrier. Owing to the mechanical flexibility, transparency, and low contact barrier, the ZnO NWs/graphene hybrids show excellent field emission properties. Low turn-on field values of 2.0 V μm−1, 2.4 V μm−1, and 2.8 V μm−1 were measured for convex, flat, and concave deformations, respectively. Such variation of field emission properties were attributed to the modification of ZnO NWs emitter density upon mechanical deformation.

Graphical abstract: Vertical ZnO nanowires/graphene hybrids for transparent and flexible field emission

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Publication details

The article was received on 18 May 2010, accepted on 10 Jun 2010, published on 02 Aug 2010 and first published online on 02 Aug 2010


Article type: Paper
DOI: 10.1039/C0JM01495H
Citation: J. Mater. Chem., 2011,21, 3432-3437
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    Vertical ZnO nanowires/graphene hybrids for transparent and flexible field emission

    J. O. Hwang, D. H. Lee, J. Y. Kim, T. H. Han, B. H. Kim, M. Park, K. No and S. O. Kim, J. Mater. Chem., 2011, 21, 3432
    DOI: 10.1039/C0JM01495H

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