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Inorganics 2015, 3(2), 178-193;

Biomolecules Electrochemical Sensing Properties of a PMo11[email protected] Few Layer Graphene Nanocomposite

REQUIMTE/LAQV, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
Laboratoire de Chimie de Coordination UPR CNRS 8241, Composante ENSIACET, Université Toulouse, 4 allée Emile Monso, 31030 Toulouse, France
Laboratoire de Chimie Physique, UMR 8000 CNRS, Université Paris-Sud, 91405 Orsay Cedex, France
Authors to whom correspondence should be addressed.
Academic Editors: Greta Ricarda Patzke and Pierre-Emmanuel Car
Received: 15 April 2015 / Accepted: 12 May 2015 / Published: 20 May 2015
(This article belongs to the Special Issue Polyoxometalates)
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A novel hybrid nanocomposite, PMo11[email protected] few layer graphene, was prepared by a one-step protocol through direct immobilization of the tetrabutylammonium salt of a vanadium-substituted phosphomolybdate (PMo11V) onto N-doped few layer graphene (N-FLG). The nanocomposite characterization by FTIR and XPS confirmed its successful synthesis. Glassy carbon modified electrodes with PMo11V and PMo11[email protected] showed cyclic voltammograms consistent with surface-confined redox processes attributed to Mo-centred reductions (MoVI→MoV) and a vanadium reduction (VV→VIV). Furthermore, PMo11[email protected] modified electrodes showed good stability and well-resolved redox peaks with high current intensities. The observed enhancement of PMo11V electrochemical properties is a consequence of a strong electronic communication between the POM and the N-doped few layer graphene. Additionally, the electro-catalytic and sensing properties towards acetaminophen (AC) and theophylline (TP) were evaluated by voltammetric techniques using a glassy carbon electrode modified with PMo11[email protected] Under the conditions used, the square wave voltammetric peak current increased linearly with AC concentration in the presence of TP, but showing two linear ranges: 1.2 × 106 to 1.2 × 10−4 and 1.2 × 10−4 to 4.8 × 10−4 mol dm−3, with different AC sensitivity values, 0.022 A/mol dm−3 and 0.035 A/mol dm−3, respectively (detection limit, DL = 7.5 × 10−7 mol dm−3). View Full-Text
Keywords: phosphomolybdates; N-doped graphene flakes; nanocomposite; electro-catalysis; biomolecules phosphomolybdates; N-doped graphene flakes; nanocomposite; electro-catalysis; biomolecules

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Fernandes, D.M.; Nunes, M.; Carvalho, R.J.; Bacsa, R.; Mbomekalle, I.-M.; Serp, P.; De Oliveira, P.; Freire, C. Biomolecules Electrochemical Sensing Properties of a PMo11[email protected] Few Layer Graphene Nanocomposite. Inorganics 2015, 3, 178-193.

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