Liquid Exfoliated Graphene: A Practical Method for Increasing Loading and Producing Thin Films

Liquid exfoliation of graphene offers the potential of an easy, simple, and scalable means for the production of high quality graphene sheets. Increasing the loading of exfoliated graphene dispersions is necessary to increase efficiency and make liquid exfoliation a practical method for graphene synthesis. This publication demonstrates the use of NH 3 as an additive to significantly increase the loading of graphene within 1-methyl-2-pyrrolidinone (NMP) dispersions. The simple synthesis of graphene films by addition of the dispersion to water is also demonstrated. The films, made from a disordered collection of graphene flakes, are predominantly constructed from few, <5, layered graphene.