Band gap analysis of zinc oxide for potential bio glucose sensor

Abstract

Zinc oxide (ZnO) is a versatile material with exceptional physical and chemical properties. The aim was to synthesize ZnO nanoparticles using the hydrothermal method at high pressure and temperature, as the sample cannot dissolve under normal conditions. Powder X-ray Diffraction (XRD) was utilized to determine the crystallite size and phase of the ZnO nanoparticles. UV–Visible Spectroscopy revealed an absorption bandgap at 380 nm, which was attributed to ZnO nanoparticles. Cyclic Voltammetry was used to identify the oxidation and reduction mechanisms of glucose at different scan rates. The CV analysis confirmed that an increase in scan rate enhanced conductivity, and a relationship exists between peak current and the square root of the scan rate. Highly crystalline ZnO was an excellent choice for glucose sensing due to its high electron mobility and low toxicity. Scanning Electron Microscopy (SEM) was used to study the morphology, shape, and grain size of ZnO at various resolutions.