Using a green and simple electrochemical method,a reduced graphene oxide-gold nanocomposite thin film was prepared for the detection of L-tyrosine(L-Tyr).The modified electrode was characterized via scanning electron microscopy(SEM),cyclic voltammetry(CV),and electrochemical impedance spectroscopy(EIS).The electrochemical behavior of L-Tyr on the modified electrode in 0.1 mol/L phosphate buffer solution was investigated using differential pulse voltammetry(DPV).The results demonstrated a significantly enhanced voltammetric response of L-Tyr on the modified electrode compared to a bare glassy carbon electrode(GCE).Optimization of the composite film's thickness,pH of the supporting electrolyte,deposition potential,and accumulation time were carried out.Under the optimal experimental conditions,the oxidation peak current of L-Tyr exhibited a good linear relationship within the concentration ranges of 0.1-50 μmol/L and 50-1000 μmol/L using DPV.Moreover,the sensor demon-strated a detection limit of 50 nmol/L,a sensitivity of 0.553 μA·μmol·L‒1,and displayed excellent repeatability,stability,and anti-interference properties.
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