Field emission from graphene based composite thin films

Field emission from graphene is challenging because the existing deposition methods lead to sheets that lay flat on the substrate surface, which limits the field enhancement. Here we describe a simple and general solution based method for the deposition of field emitting graphene/polymer composite thin films. The graphene sheets are oriented at some angles with respect to the substrate surface leading to field emission at low threshold fields $(\sim 4\mathrm{V}\mu {\mathrm{m}}^{-1})$ . Our method provides a route for the deposition of graphene based thin film field emitter on different substrates, opening up avenues for a variety of applications.