Abstract
The authors report on a nonenzymatic catechol sensor that is based on the immobilization of ferrocene (Fc) on graphene oxide (GO). A glassy carbon electrode (GCE) was modified with GO which then was silanized with (3-aminopropyl)trimethoxysilane. Ferrocenecarboxaldehyde was then immobilized on GO via formation of a Schiff base. The immobilization process was monitored stepwise by using FTIR spectroscopy, X-ray diffraction, cyclic voltammetry (CV) and electrochemical impedance spectroscopy. Investigation of the modified electrode by CV revealed a pair of well-defined redox peaks with anodic and cathodic peak potentials at +0.380 and +0.277 V, corresponding to the Fc/Fc+ redox couple. The Fc modified electrode exhibits excellent electrocatalytic activity towards the oxidation of catechol at a typical working voltage of +0.45 V (vs. Ag/AgCl). The response is linear in the 3 to 112 μM catechol concentration range, the detection limit is 1.1 μM, and the sensitivity is 1184.3 μA·mM−1·cm−2. The sensor is stable, reproducible and reasonably selective. It was successfully applied to the determination of catechol in spiked tap water and lake water samples.
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Acknowledgements
This work was financially supported by the Science and Engineering Research Board (SERB), Government of India (Sanction No. SB/FT/CS-078/2014). The authors are thankful to SIF DST-VIT-FIST, VIT University, Vellore for providing the analytical facilities.
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Elancheziyan, M., Manoj, D., Saravanakumar, D. et al. Amperometric sensing of catechol using a glassy carbon electrode modified with ferrocene covalently immobilized on graphene oxide. Microchim Acta 184, 2925–2932 (2017). https://doi.org/10.1007/s00604-017-2312-2
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DOI: https://doi.org/10.1007/s00604-017-2312-2