Abstract
A new electrochemical sensor HNC Rh ImS GCE was built by coating a glassy carbon electrode GCE with a suspension made of rhodium nanoparticles stabilized in zwitterionic surfactant tetradecyl imidazolium propanesulfonate ImS and halloysite nanoclay HNC The sensor was characterized by cyclic voltammetry electrochemical impedance spectroscopy transmission electron microscopy and profilometry The modifier was found to enhance the electroactive surface area and lower the charge transfer resistance in comparison to the bare GCE The proposed sensor was applied in the electrochemical analysis of paracetamol with a limit of detection of nmol L and a linear range of to micro mol L r under optimized conditions acetate buffer mol L pH employing differential pulse voltammetry Precision studies revealed the proposed sensor is reproducible on an interday intraday basis showing low relative standard errors Paracetamol tablets were selected as target sample and the sensor showed good selectivity and low relative error in comparison to the labelled content RE with recoveries ranging from to
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