A highly efficient synthetic process of graphene films with tunable optical properties

•Uniform and controlled graphene oxide films were deposited on substrates using Langmuir-Blodgett (LB)-based method.•The influence of thermal reduction on GO films was systematically characterized.•800 °C was considered the most effective for reduction.•The optical properties were investigated for different reduced GO films.•A tunable surface wettability of GO films was found after heat treatment.

The paper reports an effective LB-based process to produce graphene oxide (GO). Uniform and controlled graphene oxide (GO) films were deposited on substrates by a simple and high-efficient Langmuir-Blodgett (LB)-based method. The influence of thermal reduction on GO films was systematically characterized and the annealing temperature of 800 °C was considered the most effective for reduction of GO. The optical and electrical properties were investigated for different reduced GO films to obtain the excellent sheet resistances of 440-620 Ω/sq with 60-70% range of light transparencies. A tunable surface wettability of GO films was found after heat treatment.