Multifunctional hybrid films prepared by aqueous stabilization of graphene sheets viaing cellulose nanofibers and exfoliated montmorillonite system

In this paper, reduction of graphene oxide (RGO) nanosheets were stably dispersed in water directly in the presence of montmorillonite (MMT) nanoplatelets and cellulose nanofibers (CNFs). This could be attributed to the steric hindrance of CNFs and the repulsion between different charges which exist in RGO nanosheets, MMT nanoplatelets and CNFs. Taking advantage of these stable hybrids, the films with unique microstructure have been fabricated successfully via vacuum filtration. For the highly oriented layer structures, the films have been given excellent fire resistance, high thermal stability and good flexibility. Meanwhile, because of the excellent electrical property of RGO nanosheets and the dielectric property of MMT nanoplatelets, there are lots of micro-capacitors in the film which has unique microstructure, and these micro-capacitors can impart the film high dielectric constant and relatively low dielectric loss.