A graphite pencil electrode with electrodeposited Pt-CuO for nonenzymatic amperometric sensing of glucose over a wide linear response range
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.
KeywordsGraphite pencil electrode Pulsed electrodeposition Chronopotentiometry Pt-CuO nanomaterials Bi-metalic catalyst Direct electrochemical oxidation Blood glucose
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).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no competing interests.
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