High Temperature Phase Transitions of Graphene Oxide Paper from Graphite Oxide Solution

Graphene oxide paper (GOP) can be prepared through simplified filtration of a graphite oxide solution. It possesses similar properties to graphene. In this study, the graphite oxide solution was synthesized from commercial graphite by means of Hummer's method. It corresponds to the dried GOP that was prepared by deposition on a cellulose filter. It is found that the mesophase of the dried graphene oxide papers obtained from the graphite was thermotropic hexagonal columnar liquid crystal. Its higher temperature transitions were found at 80 °C, 150 °C and 170 °C–180 °C. Therefore, it could be used for thermal storage and conductive materials in the future.