Bi2WO6 Quantum Dots Decorated Reduced Graphene Oxide: Improved Charge Separation and Enhanced Photoconversion Efficiency

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• 作者：Songmei Sun ; Wenzhong Wang ; Ling Zhang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：May 9, 2013
• 年：2013
• 卷：117
• 期：18
• 页码：9113-9120
• 全文大小：555K
• 年卷期：v.117,no.18(May 9, 2013)
• ISSN：1932-7455

文摘

In this study, Bi₂WO₆ 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 Bi₂WO₆ QDs and RGO simultaneously. The Bi₂WO₆ QDs with a size of 3鈥? nm anchored uniformly on the RGO sheets to form RGO-Bi₂WO₆ QDs composites. The RGO sheets not only acted as a supporter and stabilizer for the Bi₂WO₆ 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-Bi₂WO₆ QDs composites was increased 8-fold compared with that of the pure Bi₂WO₆ 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.