MoS2/CeO2 Based Composite for Ammonia Sensing

Abstract Here, we report synthesis of MoS 2 /CeO 2 composite using a two-step hydrothermal techniques. A two-terminal sensor device made from the composite was further used for ammonia detection at room-temperature. The device has shown selective behavior toward ammonia gas molecules as compared to acetone, ethanol and N-methyle pyroliddone (NMP). Further, the sensor display delayed recovery and a relative-response of eleven percent for ammonia (30 ppm). The decrease in resistance after interaction with ammonia gas molecules indicate n-type conduction of the composite. Conduction type was further confirmed using Mott-Schottky measurements which gives a positive slope with composite as working electrode. These initial studies indicated that transition-metal dichalcogenides based composite with metal oxide semiconductor could be optimized for selective detection of various volatile organic compounds.