Flexible graphene based field effect transistor by the soaking and printing technology

Flexible electronic printing method is an emerging state-of-art manufacturing technology with the merits of high-efficient and low-cost. In this work we described a total solution processable and printable graphene field effect transistor by using the liquid phase exfoliated graphene (LEG), the soaking method to coat the graphene film on the polyethylene terephthalate (PET) films, as well as the interdigital electrodes, named as LEG-FET. Firstly, the graphene material was prepared by the liquid-phase exfoliation, then it was used to fabricate the interdigital LEG-FETs on the flexible PET films. The electronic features of the as-prepared devices were carefully examined.