Abstract
Numerical simulations of field emission of the titanium dioxide (TiO2) nanotube (NT) arrays on a planar cathode were performed by solving the Laplace equation. The studies showed that the field enhancement factor of TiO2 NT array first increased, and then reached the “saturated” maximum value when intertube distance s was close to NT height h. The emission current density also increased with spacing but started decreasing after s=2h. The behavior of field enhancement factor and emission current density was interpreted taking into account field screening effects. The anode–cathode distance has little effect on the field emission properties of TiO2 NT arrays.
Published Version
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