The electrochemical detection of epinephrine at a carbon dot/copper oxide (CD/CuO) composite was investigated in this study. The individual copper oxide nanoparticles, carbon dots as well as the composite were characterized using scanning electron microscopy, transmission electron microscopy, FT-IR, UV-visible spectroscopy and x-ray diffraction spectroscopy. The CD/CuO composite was applied for the modification of bare glassy carbon electrode (GCE) which was applied for epinephrine detection. The modified electrode offered a detection limit of 14.99 micomolar and satisfactory recovery of epinephrine from chicken serum. The application of density functional theory (DFT) to the dependence of the redox current peaks on scan rates confirms the identity of the reaction medium with scan rate changes. The DFT calculations and other experimental data also suggest the possibility of a mixed (adsorptive and diffusive) process at the modified electrode.

Electrochemical epinephrine detection based on carbon dots/copper oxide nanocomposite: Voltammetric, spectroscopic and theoretical studies

ACS Spring 2022

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