Sony has developed a new graphene producing process that use a roll-to-roll method. They have built a machine that can produce graphene sheets up to 100 meters in length (23 cm width), and the resulting sheet is the largest area graphene sheet in the world by far (the previous record was Samsung's 40" sheet from back in 2011).

Sony's new process integrates CVD and roll-to-roll, at a temperature of 1,000°C. The idea is to directly apply a current to a copper (Cu) foil that is the catalyst of graphene and a substrate for the CVD method so that only the Cu foil is heated. As a result, the thermal load on the entire machine was drastically reduced.

Sony also reported that they managed to develop a transparent conductive film with good properties from the graphene made on the Cu foil by transcribing it to a PET film.

source: Tech-On