In this study, Bi 2 WO 6 quantum dots (QDs) decorating reduced graphene oxide (RGO) sheets were produced by a facile one-step hydrothermal synthesis process, which converts the reactant precursors to Bi 2 WO 6 QDs and RGO simultaneously. The Bi 2 WO 6 QDs with a size of 3–5 nm anchored uniformly on the RGO sheets to form RGO-Bi 2 WO 6 QDs composites. The RGO sheets not only acted as a supporter and stabilizer for the Bi 2 WO 6 QDs to prevent them from being aggregation but also largely improved the charge separation in the composite material. For this preponderance, the electron lifetime in the RGO-Bi 2 WO 6 QDs composites was increased 8-fold compared with that of the pure Bi 2 WO 6 QDs. The much enhanced lifetime improved its performance in environmental purification and photovoltaic conversion under the irradiation of simulated sun light. This work not only provides a principle method to produce graphene-composited multiple metal oxide QDs by one-step process but also a route to obtain efficient functional material for environmental purification and optoelectronic applications.
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Sun et al. (2013) studied this question.