GLUCOSE SENSOR USING CYCLIC VOLTAMMETRIC METHOD BASED ON NiO/ITO ELECTRODE
Abstract
Nickel oxide/Indium Tin Oxide (NiO/ITO) electrode was fabricated by electrodeposition method using the three-electrode system from 0.1 M NiSO4 and 0.1 M H2SO4 electrolyte support solution to form Ni/ITO followed by oxidation in the air to convert Ni to NiO. The morphology and crystalline structure of NiO were characterized by SEM (Scanning Electron Microscope), XRD (X-Ray Diffraction), and Raman spectroscopy. The cyclic voltage method was used to investigate NiO/ITO electrode's electrochemical properties in the alkaline medium of NaOH solution and determine the glucose concentration. The conditions for Ni deposition onto ITO substrate were 0.1 M NiSO4, electrolyte support of 0.1 M H2SO4 under deposition potential -1.2 V (vs. Ag/AgCl reference electrode) for 360 seconds. The cyclic voltammetry (CV) technique method to determine the concentration of glucose showed the linear range detection of 0 to 500 μM, R = 0.9885 with high sensitivity of 2088 µAcm-2mM-1 for positive scan and 0.5 to 13 mM, R = 0.9966 for negative scan, the detection limit of 5 μM.