Abstract
The current study demonstrates field emission response of nickel cobalt oxide (NCO) nanostructures-graphene oxide (GO) hybrid. NCO nanostructures were synthesized directly on Ni substrates by hydrothermal method and GO was synthesized by modified Hummer's method. The as-synthesized nanostructures were characterized to determine phase, morphology, composition, and work function. The bare, one-dimensional (1D) needle-like nanostructure of NCO showed a low field emission response. Turn-on fields for NCO were 5.8 V/µm and 6.0 V/µm for foam and foil substrates, respectively. By making a hybrid of GO layers on top of the NCO nanostructure, the field emission response was found to enhance abruptly. The turn-on field was reduced down to 2.9 V/µm the hybrid structure from a high value of 6.1 V/µm. Maximum emission current density of the NCO foil and NCO foam was 90 and 132 µA/cm2, respectively. After depositing GO on these samples, maximum current increased to 1090 and 2360 µA/cm2, respectively. The combination of 1D and 2D nanostructure offers a modified surface, leading to a change of local field concentration and enhanced field emission. Surface modification by the deposition of GO on the NCO nanostructure led to enhancement of field emission response.
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