Changes in Colloidal Properties of Graphene Oxide by Mild Thermal Annealing
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Graphene oxide (GO) is covered with dense oxygen functional groups on the basal plane and edges, thus exhibits good dispersibility and colloidal stability in aqueous solution. Based on these properties, GO fibers can be produced from the wet-spinning of GO liquid crystal (LC) suspensions, where the qualities of the produced fibers are often affected by colloidal stability. Here, we report that mild heating for GO suspensions increases electrostatic repulsion, thereby improving colloidal stability and local orientation of GO colloids. On the contrary, longer heating decreases the colloidal stability of the GO colloids. The delicate change of colloidal stability is discussed with its rheological properties of GO LC.