Abstract
A facile method to produce conformal coated reduced graphene oxide (rGO) on vertically aligned titanium oxide (TiO2) 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 (80 mA/cm2), low turn-on field (1.0 V/μm) 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 TiO2 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.
Highlights
Wide band-gap semiconductors including TiO216, MoO35, SiC17, ZnO12, WO318 and similar materials have attracted much interest for their favorable FE properties because of their low electron affinity as well as better chemical stability
The XRD pattern of as-synthesized reduced graphene oxide (rGO) nanosheets is shown in Figure S1, where (002) and (101) planes confirm the graphitic nature with hexagonal phase (JCPDS No 75–1621)
No diffraction peak corresponding to rGO is observed in the hybrid structure, which may be because of the ultrathin nature of the rGO nanosheets layer coated on TiO2 nanotube 3D arrays (NTAs)
Summary
Wide band-gap semiconductors including TiO216, MoO35, SiC17, ZnO12, WO318 and similar materials have attracted much interest for their favorable FE properties because of their low electron affinity as well as better chemical stability. For better performance and economical cost of field emitter materials, it is important to look for carbon based nanostructure materials having high surface area In this exploration, specially, the 2D (two dimensional) nanomaterials (e.g. graphene) can be a better alternative, which can be integrated with TiO2 at nanoscale to form hybrid materials for enhanced FE property. An anodic oxidation process has been used extensively for the rapid production of aligned TiO2 nanotubes because it has a good controlled pore size, uniformity and conformability over large areas This is a facile process at economic cost and the desired properties can be obtained by tuning the dimensions.
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