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.
This work was supported by AGH University of Science and Technology grant (Project No. 18.104.22.1689).
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