Abstract
Production of NiO nanoparticles (NiO/NPs) by chemical precipitation is the approach utilized in this work. Nanopowders properties are identified by TG, FTIR, XRD, SEM, and TEM. The results obtained confirm the presence of nickel oxide nanopowders produced during chemical precipitation. In continuous, a novel NiO/NPs carbon paste electrode (NiO/NPs/CPE) had been fabricated. Electrochemical behavior of vitamin C at the NiO/NPs /CPE had been investigated in pH 7.0 phosphate buffer solution (PBS) by cyclic voltammetry (CV), chronoamperometry (CA) and differential pulse voltammetry (DPV). The experimental results suggested that the modified electrode exhibited an electrocatalytic activity toward the redox of vitamin C. Detection limit of vitamin C was found to be 0.05 μM. The proposed sensor was successfully applied for the determination of vitamin C in food samples.