Application of graphene supporting platinum nanoparticles layer in electrochemical sensors with potentiometric and voltammetric detection
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The present work reports a possibility of using a layer made of graphene supporting platinum nanoparticles (PtNPs-GR) in electrochemical sensors as active and intermediate layer. New sensors with greatly improved both potentiometric and voltammetric signals were prepared by using a simple and effective drop casting method and characterized by a cyclic voltammetry and a electrochemical impedance spectroscopy. The performance of the new potentiometric sensor was evaluated by the use an ion-selective membrane with well-known valinomycin ion carrier. Potassium electrodes had a Nernstian slope (59.10 mV/pK), high stability and reproducibility of the standard potential values, and a very small drift potential. Under optimized operating conditions, the voltammetric sensor with PtNPs-GR responded to paracetamol concentration in the range from 20 nM to 2.2 μM with the detection limit of 8 nM.
KeywordsGraphene Platinum nanoparticles Electrochemical sensors Voltammetric detection Ion-selective electrodes
The author (Cecylia Wardak) thanks the Faculty of Materials Science and Ceramics of AGH University of Science and Technology for invitation and possibility of participating in research.
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