LAUSR

Abstract We report the effect of treatment at high temperature (2000 °C) on the exfoliation of a graphene that had been prepared by amine-treatment of an FeCl3-graphite intercalation compound and by preheat-treatment at low temperature (900 °C). A well expanded morphology was produced by the exfoliation, and the expansion did not lead to significant defects in the graphene sp2 sheet after heating at 2000 °C. The exfoliated graphene also exhibited an enhanced capacitance. It should be noted that this heat-treatment method at ultra-high temperature provides a physical procedure for defect-free graphene exfoliation following the electrochemical performance.