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In this study TiO 2 /reduced graphene oxide (TiO 2 /rGO) bipyramid with tunable nanostructure was fabricated by two-step solvothermal process and subsequent heat-treatment in air. The as-synthesized anatase TiO 2 nanocrystals possessed morphological bipyramid with exposed dominantly by ( 101) facets. Polyethylenimine was utilized during the combination of TiO 2 and graphene oxide (GO) to tune the surface charge, hindering the restack of graphene during solvothermal process and resulting in 1 to 5 layers of rGO wrapped on TiO 2 surface. After a further calcination, a portion of carbon quantum dots (CQDs) with a diameter about 2 nm were produced owing to the oxidizing and cutting of rGO on TiO 2 . The as-prepared TiO 2 /rGO hybrid showed a highly photocatalytic activity, which is about 3.2 and 7.7 times enhancement for photodegradation of methyl orange with compared to pure TiO 2 and P25, respectively. We assume that the improvement of photocatalysis is attributed to the chemical bonding between rGO/CQDs and TiO 2 that accelerates photogenerated electron-hole pair separation, as well as enhances light harvest.

A two-dimensional titanium dioxide-based hydrophilic channel demonstrates unidirectional water transporting properties.