Preparation of Graphene Flexible Transparent Conductive Films

Abstract

Graphite powder as the raw material was directly sonicated in organic solvents by the liquid-phase exfoliation method,to produce high quality graphene dispersion through a high-speed centrifugation.The spray-coating method was used to prepare transparent and conductive graphene films based on flexible substrates(PET).The influence of different organic solvents and substrate treatments on the surface morphology and photoelectric properties of graphene films was studied by SEM and four-point probe tester characterization methods.The results show that graphene films are less structural defects and don't introduce other functional groups by using DMF as the dispersant.The substrate processed with silver metal grid can effectively reduce sheet resistance of the film,and the sheet resistance is reduced to 172 Ω/□ when the transmittance is 81%(λ=550 nm).This new structure of graphene/silver metal grid flexible transparent conductive film is expected to replace the market mainstream ITO film.