Enhanced field emission from large scale uniform monolayer graphene supported by well-aligned ZnO nanowire arrays

Large scale, uniform single-layer graphene was transferred onto well-aligned ZnO nanowire arrays to produce high density nanoscale protrusions within graphene for efficient field emission. Polymethyl methacrylate (PMMA) was used as a supporting layer to provide a quasi-flat surface for graphene transfer. Highly efficient (maximum current density of similar to 500 mu A/cm(2)) and stable field emission with low turn-on fields (5.4 V/mu m) was observed due to highly localized electric field, which is much better than those without using PMMA. F-N plot showed an unique up-bending feature of single-layer graphene. Our approach provides an efficient way to produce high quality single-layer graphene field emitters. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4763474]