Effects of graphene oxide on dispersion stability of Titanium dioxide nanoparticles

摘要

In this work, we investigated the effects of GO on dispersion stability of the two types of TiO_2 NPs under different pHs. At pH 4, heteroaggregation may occur between GO and the two types of TiO_2 NPs (TiO_2 Nanotube and TiO_2 Nanowire), enhancing the sedimentation of TiO_2 NPs. However, at pH 7 and 10, GO enhanced the suspension of the two types of TiO_2 NPs. Electrostatic interaction could be a major mechanism for TiO_2 NPs-GO interaction.