Abstract
Graphene oxide (GO)-coated copper oxide (CuO) nanowire arrays were prepared as field emission cathodes using a solution process, in which CuO nanowires were grown on Cu substrates by a low-temperature hydrothermal process and the covering of GO sheets was carried out using an electrostatic self-assembly method. The field emission investigations of GO/CuO cathode showed a low turn-on field of 3.7 V/μm and a high enhancement factor (2080) compared to those of bare CuO nanowires. Furthermore, the emission current was stable without any attenuation during the testing. The GO/CuO composite nanostructures are promising field emission cathodes in field emission application.
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