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• W2031331677 abstract "Graphene-gold nanohybrids have become a hot research topic in material science, because the hybridization can be an effective strategy to enhance the functionality of materials and the integration of nanomaterials on graphene nanosheets potentially paves a new way to improve their electronic, chemical and electrochemical properties. The study reported a novel graphene-gold nanohybrid with excellent electrocatalytic performance for electrochemical detection of glucose. First, the monodisperse gold nanoparticles (GNs) were prepared via the citrate reduction associated with pH-shifting. The resulting GNs give an average particle size of 6 nm and narrow size distribution. Then, one part of the GN solution was mixed with the graphite oxide solution, which followed by the ascorbic acid reduction and unidirectional freeze-drying to prepare graphene [email protected] ([email protected]). The formed [email protected] offers a well-defined three-dimensional and orientated porous structure. In addition, the most of GNs in the aerogel was embedded in the intertwined graphene sheets. Finally, another part of the GN solution was sucked into the [email protected] to obtain [email protected]/GNs. It was subjected to freeze-drying and thermal annealing in air at 180 °C to remove the citrate modified on the surface of GNs. Because their active sites were well exposed outside, the adsorbed GNs are of high catalytic activity. The study shows that the as-prepared [email protected]/GNs gives high electrical conductivity (15.4 S m−1), specific surface area (291.6 m2 g−1) and apparent heterogeneous electron transfer rate constant (14.8 ± 0.12 cm s−1). The sensor based on the [email protected]/GNs displays ultrasensitive electrochemical response to glucose, owing to largely enhanced electron transfer, mass transport and catalytic activity. Its peak current linearly increases with the increase of glucose in the range from 0.01 to 16 mM with the detection limit of 0.004 mM (S/N = 3). The analytical method presents the advantage of sensitivity, repeatability and stability compared with present glucose sensors. It has been successfully applied in the detection of glucose in serum samples with the spiked recovery of 95.7–104.2%. The study also provides a promising approach for building on various graphene-metal nanohybrids with excellent electrochemical performance for sensing, catalysis and energy storage/conversion devices." @default.
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• W2031331677 date "2015-03-01" @default.
• W2031331677 modified "2023-10-06" @default.
• W2031331677 title "Novel graphene-gold nanohybrid with excellent electrocatalytic performance for the electrochemical detection of glucose" @default.
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• W2031331677 doi "https://doi.org/10.1016/j.snb.2014.11.004" @default.
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