Electrochemical Fabrication of a GO-NiO/AISI 316L Electrode and Its Evaluation for Glucose Detection

This paper describes the fabrication of a GO-NiO/AISI 316L electrode and its subsequent evaluation for enhanced glucose detection. The GO-NiO/AISI 316 L electrode was fabricated in situ by the electrodeposition of a GO-NiO nanocomposite generated by cyclic voltammetry (CV) on an AISI 316L stainless steel substrate, with a subsequent thermal treatment at 400 degrees C. The obtained electrode was characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The effectiveness of the electrode to detect glucose was evaluated by both cyclic voltammetry and chronoamperometry (CA). SEM and FTIR results showed that GO-NiO nanocomposite was realized on the surface of the stainless steel substrate confirming the successful fabrication of the GO-NiO/AISI 316L electrode. Electrochemical experiments showed that the electrode catalyzed the electrochemical oxidation of glucose in an alkaline medium. Voltammetric results suggested that the glucose oxidation rate was controlled by glucose diffusion on the electrode surface. The GO-NiO/AISI 316L electrode could detect glucose in an alkaline medium in a linear range of 0.01 mM to 0.7 mM with a response time of less than 5 s, a detection limit of 0.05 mM and a sensitivity of 744.68 mu A mM(-1) cm(-2).