Thermally evaporated mgo-nio nanocomposite thin films for ethanol gas sensor

In the current research work, MgO-NiO nano composite thin films have been prepared on glass substrate by using thermal evaporation technique and studied electrical and gas sensing properties of prepared films. The prepared films were annealed for 2 hours at 350°C in a muffle furnace. The electrical properties of prepared MgO-NiO nano composite thin films were investigated on the basis of resistivity, Temperature Coefficient Resistance (TCR) and activation energy. The prepared MgO-NiO nano composite thin films were exposed to NH3, LPG, NO2, and ethanol gas at concentration of 100,200,300 and 400 ppm and at surrounding temperature of 50, 100,150, 200 and 250 °C for determine sensitivity of the films. Maximum sensitivity has been found to the ethanol gas 85.48% at 150 °C temperature and concentrations of ethanol gas was 300 ppm. Films also show quick response time (~ 9 sec) and recovery time (~ 18 sec).