Carbon paste electrodes modified with SnO2/CuS, SnO2/SnS and Cu@SnO2/SnS nanocomposites as voltammetric sensors for paracetamol and hydroquinone.

Abstract

Several nanocomposites of tin oxide with CuS, SnS or Cu@SnS were prepared and used to modify carbon paste electrodes (CPEs). The structure and morphology of the materials were studied by XRD and SEM techniques. Cyclic voltammetry and electrochemical impedance spectroscopy were applied to investigate their electrochemical properties. The modified CPEs exhibit superior voltammetric response to paracetamol (PAT) and hydroquinone (HQ) (when compared to a bare CPE) in terms of onset oxidation potential and current density. The CPE modified with SnO2/SnS was applied to voltammetric determination of PAT (at a working potential of 0.55V versus Ag/AgCl and with a 0.06μM detection limit), and of HQ (at 0.39V versus Ag/AgCl with a 0.2μM detection limit). The voltammetric responses were linear in the range from 1.0 to 36μM for PAT and from 1.0 to 85μM for HQ. Graphical abstract Carbon paste electrodes were modified with several new tin oxide and sulfidicnanocomposites and thenexhibit superior properties in terms of detection of paracetamol and hydroquinone.