Study on NH₃ Gas Sensors using a WO₃-based Multiple-layered Thin Film with Pt Catalyst

Abstract

NH₃ gas is a poisonous substance that adversely affects the environment and humans. A low level NH₃ is created by human bodies and emitted as a component of urine and exhaled breath. Therefore, the detection of NH₃ gas is important to monitor human health conditions. A novel WO₃ multiple-layered thin film NH₃ sensor using Pt catalyst has been developed in this study. WO₃ thin film coated with Pt nanoparticles successfully improves the sensitivity to NH₃ gas. Furthermore, WO₃ multiple-layered thin film with an interspace has the effect of enhancing the sensitivity and lowering the optimum operating temperature. The developed sensor can detect as low as 1 ppm NH₃ gas.