High-Performance Stable Field Emission with Ultralow Turn on Voltage from rGO Conformal Coated TiO 2 Nanotubes 3D Arrays

Abstract

A facile method to produce conformal coated reduced graphene oxide (rGO) on vertically aligned titanium oxide (TiO 2) nanotubes three dimensional (3D) arrays (NTAs) is demonstrated for enhanced field emission display applications. These engineered nano arrays exhibit efficient electron field emission properties such as high field emission current density (80a €‰mA/cm 2), low turn-on field (1.0a €‰V/I 1/4m) and field enhancement factor (6000) with high emission current stability. Moreover, these enhancements observed in nano arrays attribute to the contribution of low work function with non-rectifying barriers, which allow an easy injection of electrons from the conduction band of TiO 2 into the Fermi level of reduced graphene oxide under external electric field. The obtained results are extremely advantageous for its potential application in field emission devices.