Synthesis of Liquefied Petroleum Gas (LPG) Sensor based on Nanostructure Zinc Oxide using Chemical Bath Deposition (CBD) Methods

Porous thin layer of zinc oxide have been made using chemical bath deposition method with the precursor of zinc nitrate tetrahydrate on a substrate of alumina (Al2O3). The morphology of the formed layer has the form of sheet structure and flowerlike structure. ZnO layers showed the lack of oxygen. Conductivity sensors varies with changes in operating temperature, the higher the operating temperature, the higher the conductivity. The best performance shown by the sensors with 100% solvent composition of water (sheet structure) at a temperature of 200oC with a sensitivity of 44.83%, 80 seconds response time and 90 seconds recovery time. The sensor is able to detect the presence of LPG and also can measure the concentration of LPG.