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      NiCo alloy nanoparticles anchored on polypyrrole/reduced graphene oxide nanocomposites for nonenzymatic glucose sensing

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          Abstract

          The combination of PPy and graphene oxide was used as an effective supporting substrate for the loading of alloys.

          Abstract

          NiCo alloy nanoparticles anchored on polypyrrole/reduced graphene oxide nanocomposites (NiCo/PPy/RGO) were successfully constructed through in situ chemical polymerization and a coreduction process for glucose sensing. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were employed to characterize the morphology and composition of NiCo/PPy/RGO. The electrochemical properties of the sensor were investigated by cyclic voltammetry and amperometry. The results indicated that the supporting substrate of PPy/RGO nanocomposites can provide a larger surface area for the dispersion of NiCo nanoparticles. Meanwhile, this nonenzymatic glucose sensor displayed an excellent electrocatalytic activity to glucose oxidation, with a low detection limit of 0.17 μM (S/N = 3), a linear range of 0.5 μM–4.1 mM, and a sensitivity of 153.5 μA mM −1 cm −2. The present study demonstrates that the NiCo/PPy/RGO composites are promising electroactive materials for developing non-enzymatic glucose sensors.

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          Most cited references 42

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          Synthesis of Graphene and Its Applications: A Review

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            Electrochemical non-enzymatic glucose sensors.

            The electrochemical determination of glucose concentration without using enzyme is one of the dreams that many researchers have been trying to make come true. As new materials have been reported and more knowledge on detailed mechanism of glucose oxidation has been unveiled, the non-enzymatic glucose sensor keeps coming closer to practical applications. Recent reports strongly imply that this progress will be accelerated in 'nanoera'. This article reviews the history of unraveling the mechanism of direct electrochemical oxidation of glucose and making attempts to develop successful electrochemical glucose sensors. The electrochemical oxidation of glucose molecules involves complex processes of adsorption, electron transfer, and subsequent chemical rearrangement, which are combined with the surface reactions on the metal surfaces. The information about the direct oxidation of glucose on solid-state surfaces as well as new electrode materials will lead us to possible breakthroughs in designing the enzymeless glucose sensing devices that realize innovative and powerful detection. An example of those is to introduce nanoporous platinum as an electrode, on which glucose is oxidized electrochemically with remarkable sensitivity and selectivity. Better model of such glucose sensors is sought by summarizing and revisiting the previous reports on the electrochemistry of glucose itself and new electrode materials.
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              Layered graphene oxide nanostructures with sandwiched conducting polymers as supercapacitor electrodes.

              We demonstrate a general approach to the preparation of layered graphene oxide structures with sandwiched conducting polymers of different morphologies. The approach is conceptualized on the basis of the electrostatic interactions between negatively charged graphene oxide sheets and positively charged surfactant micelles. A graphene oxide-polypyrrole composite prepared from this approach exhibited an excellent electrocapacitive performance with a high specific capacitance over 500 F g(-1). Good rate performance and cycle ability were realized by the composite electrode. The simple method described here opens up a generalized route to making a wide range of graphene oxide-based and graphene-based composite materials for applications beyond electrochemical energy storage.
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                Author and article information

                Journal
                NJCHE5
                New Journal of Chemistry
                New J. Chem.
                Royal Society of Chemistry (RSC)
                1144-0546
                1369-9261
                2016
                2016
                : 40
                : 8
                : 6658-6665
                Affiliations
                [1 ]Institute of Analytical Science
                [2 ]Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry
                [3 ]Northwest University
                [4 ]Xi'an
                [5 ]China
                Article
                10.1039/C6NJ01264G
                © 2016
                Product
                Self URI (article page): http://xlink.rsc.org/?DOI=C6NJ01264G

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