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Inorganics 2015, 3(2), 178-193; doi:10.3390/inorganics3020178

Biomolecules Electrochemical Sensing Properties of a PMo11V@N-Doped Few Layer Graphene Nanocomposite

1
REQUIMTE/LAQV, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
2
Laboratoire de Chimie de Coordination UPR CNRS 8241, Composante ENSIACET, Université Toulouse, 4 allée Emile Monso, 31030 Toulouse, France
3
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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Abstract

A novel hybrid nanocomposite, PMo11V@N-doped 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 PMo11V@N-FLG showed cyclic voltammograms consistent with surface-confined redox processes attributed to Mo-centred reductions (MoVI→MoV) and a vanadium reduction (VV→VIV). Furthermore, PMo11V@N-FLG 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 PMo11V@N-FLG. 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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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 PMo11V@N-Doped Few Layer Graphene Nanocomposite. Inorganics 2015, 3, 178-193.

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