A TiO2-based photocatalytic reaction is demonstrated to synthesize water miscible reduced graphene oxide (RGO) sheets with conductivity comparable to that of bulk graphite. Unlike the conventional chemical/thermal reduction pathways which effectively deoxygenated the oxidized graphite, the photocatalytic method removes oxygen functional groups selectively to afford excellent conductivity restoration yet maintaining its water miscibility. The controlled redox capabilities of photocatalyst serve as an effective modulation tool to tune the conductivity restoration and hydrophobicity suppression. Besides, the evolution of defects minimization/generation in two-step pattern is monitored throughout the photocatalytic process and its association with the conductivity of RGO is established. The insights of this defects engineering at the initial stage of graphene oxide (GO) to RGO transformation provides useful information in developing optimum chemical methods to produce large domain and small defect graphene.
- Reduced Graphene Oxide; TiO2; Photocatalysis; Water Miscibility; Conductivity; Defects
Available at: http://works.bepress.com/yunhau_ng/44/