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

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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 graphite via 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 mu m(-1), 2.4 V mu m(-1), and 2.8 V mu m(-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.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2011-03
Language
English
Article Type
Article
Keywords

SENSITIZED SOLAR-CELLS; NANOWIRE ARRAYS; ZINC-OXIDE; GRAPHENE; FILMS; GROWTH; NANOCOMPOSITES

Citation

JOURNAL OF MATERIALS CHEMISTRY, v.21, no.10, pp.3432 - 3437

ISSN
0959-9428
DOI
10.1039/c0jm01495h
URI
http://hdl.handle.net/10203/22750
Appears in Collection
MS-Journal Papers(저널논문)
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