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Abstract: In this paper, we demonstrate the preparation of reduced graphene oxide (rGO) decorated with FeF3 nanoparticles (FeF3NPs) by adding FeF3 aqueous solution to the rGO ethanol/water dispersion. The obtained FeF3/rGO nanocomposite is further tested as a cathode material for rechargeable lithium batteries and found to have high discharge capacities, good rate capabilities and cycling performance. It can deliver a high discharge capacity of 476mAhg−1 at a current density of 50mAg−1 in the voltage range 1.0–4.5V. It still delivers a discharge capacity of 146mAhg−1 with 81% capacity retention after 50 charge–discharge cycles under a current density of 1000mAg−1 in the voltage range 1.7–4.5V. [Copyright &y& Elsevier]

Abstract: The present communication demonstrates the first environmentally friendly hydrothermal synthesis of nickel sulfide nanospheres/reduced graphene oxide (nickel sulfides/rGO) nanocomposites with the use of l-cysteine as a reducing agent, sulfur donor, and linker. The nanosphere consists of ultrafine particles leading to textural pores. The resulting nickel sulfides/rGO nanocomposites were further used as an electrode material for supercapacitors and found to exhibit very high specific capacitances of 1169Fg−1 and 761Fg−1 at current rates of 5Ag−1 and 50Ag−1, respectively, with good cycling stability. [Copyright &y& Elsevier]

Abstract: The carbon nitride dots (CNDs) can serve as an effective stabilizing agent for reduced graphene oxide (GO) prepared by chemical reduction using hydrazine hydrate as the reducing agent. Physicochemical characterization with a combination of techniques including UV–vis spectroscopy, Raman spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy indicate the preparation of aqueous dispersion of rGO and the formation of CNDs–rGO hybrids. We further demonstrate the subsequent self-assembly of the CNDs–rGO with glucose oxidase (GOD) into hybrids, which is confirmed by the scanning electron microscopy and electron energy dispersive spectrum analysis. As a typical application of such materials, a glucose biosensor has been constructed by deposition of the GOD–CNDs–rGO hybrids on the surface of a glassy carbon electrode. The linear detection range and detection limit are estimated to be from 40μM to 20mM (r =0.994) and 40μM at signal-to-noise ratio of 3, respectively. It is further shown that this glucose biosensor can be used for glucose detection in human blood serum. [Copyright &y& Elsevier]

Abstract: In this paper, we report on one-pot synthesis of Ag nanoparticles/reduced graphene oxide (AgNPs/rGO) nanocomposites by heating mixed solution of graphene oxide (GO) and AgNO3 with the use of diethylenetriamine as a reducing agent at 80°C for 30min. Several analytical techniques including UV–vis spectroscopy, Raman spectroscopy and transmission electron microscopy (TEM) have been employed to characterize the resulting nanocomposites. It was found that such nanocomposites exhibit good catalytic activity toward the reduction of H2O2. This nonenzymatic H2O2 sensor shows a fast amperometric response time of less than 2s. The linear detection range is estimated to be from 0.1 to 100mM (r =0.999), and the detection limit is estimated to be 3.6μM at a signal-to-noise ratio of 3. [Copyright &y& Elsevier]

Abstract: Ag nanoparticles-decorated reduced graphene oxide (AgNPs-rGO) has been successfully fabricated through a one-step strategy, carried out by hydrothermal treatment of the mixture of AgNO3 and GO solution under strong alkaline conditions at 180°C for 30min. The reaction was accomplished without extra reducing agent and surface modifier. As-synthesized AgNPs-rGO has been successfully applied in catalytic performance toward the reduction of H2O2. This H2O2 sensor shows a wide linear range of 0.1–60mM (r =0.991) and a low detection limit of 1.80μM at a signal-to-noise ratio of 3. [Copyright &y& Elsevier]