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Abstract: ZnO quantum dots-graphene (QDs-graphene) composite was synthesized using atomic layer deposition method. A photodetector fabricated from the ZnO QDs-graphene composite and polymers demonstrated high sensitivity to UV light with a maximum photoresponsivity of 247A/W at 325nm. The high photoresponsivity of this device is attributed to the high active surface to volume ratio of the ZnO QDs-graphene composite. In addition to the high photoresponsivity, fast transient response with response time on the order of tenth of milliseconds was achieved, which is attributed to high carrier transport and collection efficiency through the graphene. [Copyright &y& Elsevier]

Abstract: The ZnO/graphene nanocomposite was synthesized by high energy ball milling and evaluated as an anode material for lithium-ion batteries. EDX elemental mapping indicated that graphene was dispersed homogeneously in the ZnO matrix. The nanocomposite exhibits an initial reversible capacity of 783mAh/g and maintained a capacity of 610mAh/g after 500cycles at 100mA/g. Moreover, it shows excellent rate capability and cycling stability even at 10,000mA/g, which can be attributed to the unique structure and the synergistic effect between the nanosized ZnO and graphene. [Copyright &y& Elsevier]

A high sensitivity, fast ultraviolet (UV) photodetector was fabricated from WO3 nanodiscs (NDs)/reduced graphene oxide (RGO) composite material. The WO3 NDs/reduced GO composite material was synthesized using a facile three-step synthesis procedure. First, the Na2WO4/GO precursor was synthesized by homogeneous precipitation. Second, the Na2WO4/GO precursor was transformed into H2WO4/GO composites by acidification. Finally, the H2WO4/GO composites were reduced to WO3 NDs/RGO via a hydrothermal reduction process. The UV photodetector showed a fast transient response and high responsivity, which are attributed to the improved carrier transport and collection efficiency through graphene. The excellent material properties of the WO3 NDs/RGO composite demonstrated in this work may open up new possibilities for using WO3 NDs/RGO for future optoelectronic applications. [ABSTRACT FROM AUTHOR]

Graphene fibers are fabricated by wet-spinning an aqueous large-size and small-size graphene oxide (GO) dispersion in a rotating Me3N(C16H33)Br or CaCl2 coagulation bath. [ABSTRACT FROM AUTHOR]