Reduced Graphene Oxide Fibre Electrodes for Drug Sensing

Abstract

Reduced graphene oxide (rGO) fibre electrodes and their ability to sense paracetamol (as model drug) were studied. rGO was electrodeposited onto carbon fibre by two different approaches: potentiostatic deposition and cyclic voltammetry (CV) in the presence of graphene oxide solution. Carbon fibre electrodes coated with rGO (after five CV cycles) could sense paracetamol with an oxidation peak at 0.62 V (vs. Ag/AgCl). The limit of detection of this fibre sensor was found to be 36.3 µM with a linear range of 50–500 µM of paracetamol (R2 = 0.9901).

Electrochemical Sensing of Zinc Oxide and Peroxide Nanoparticles: Modification with Meso-tetrakis(4-carboxyphenyl) Porphyrin

“…Several electrochemical techniques are suitable for the analysis of ZnO and ZnO 2 nanoparticles, including cyclic voltammetry [27], square wave voltammetry, differential pulse voltammetry, electrochemical impedance spectroscopy [28][29][30], and faradaic charge transfer measurement of the pseudocapacitance [31]. Cyclic voltammetry (CV) had previously been reported for the electrochemical sensing of ZnO nanoparticles deposited on a graphite electrode [32], electrochemical deposition of reduced graphene oxide on carbon fibers [33], and electrochemical characterization of Co(III), Ni(II), and Cu(II) mononuclear complexes on a glassy carbon electrode [34]. This electrochemical technique takes advantage of intuitive theory, simple operation, rapid analysis, and easy training.…”