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A graphite pencil electrode with electrodeposited Pt-CuO for nonenzymatic amperometric sensing of glucose over a wide linear response range

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Abstract

A disposable nonenzymatic glucose sensor was obtained by pulsed electrodeposition of Pt-CuO on a graphite pencil electrode (GPE). The morphology of the modified GPE was studied using SEM, and the chemical composition of the coating was examined by EDAX and XRD. The electrochemical response of the modified GPE was compared with individual copper- and platinum-modified GPEs. The electrodeposition parameters were optimized with respect to the electrocatalytic activity of the deposits towards glucose oxidation. Best operated at a working potential of 0.6 V vs. Ag/AgCl, the sensor has a sensitivity of 2035 μA mM−1 cm−2, a 0.1 μM detection limit and a wide linear response range that extends up to 25 mM. It is highly selective for glucose in the presence of various exogenous and endogenous interfering species. Eventhough the requirement of alkaline medium for sensing is a limitation, easy fabrication procedure, very high sensitivity and selectivity, wide analytical range, and disposable sensor characteristics show potential application towards blood glucose determination.

Schematic representation of the Pt-CuO electrodeposited pencil graphite electrode for the nonenzymatic determination of glucose.

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Acknowledgements

Authors gratefully acknowledge the Department of Biotechnology (DBT), Government of India for the financial support (Sanction Nos. BT/PR15018/MED/32/447/2015 and BT/PR4076/MED/32/221/2011).

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Authors and Affiliations

  1. Amrita Biosensor Research Lab, Amrita School of Engineering Coimbatore, Amrita Vishwa Vidyapeetham, Tamil Nadu, 641112, India

    Anjali Sreekumar, Punnakkal Navaneeth, Punathil Vasu Suneesh & T. G. Satheesh Babu

  2. Department of Sciences, Amrita School of Engineering Coimbatore, Amrita Vishwa Vidyapeetham, Tamil Nadu, 641112, India

    Anjali Sreekumar, Punnakkal Navaneeth, Punathil Vasu Suneesh & T. G. Satheesh Babu

  3. Amrita School of Biotechnology, Amritapuri, Amrita Vishwa Vidyapeetham, Tamil Nadu, 690525, India

    Bipin G Nair

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  1. Anjali Sreekumar
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  2. Punnakkal Navaneeth
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  3. Punathil Vasu Suneesh
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  4. Bipin G Nair
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  5. T. G. Satheesh Babu
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Correspondence to T. G. Satheesh Babu.

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Sreekumar, A., Navaneeth, P., Suneesh, P.V. et al. A graphite pencil electrode with electrodeposited Pt-CuO for nonenzymatic amperometric sensing of glucose over a wide linear response range. Microchim Acta 187, 113 (2020). https://doi.org/10.1007/s00604-019-4077-2

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