INFLUENCE OF COBALT DOPING ON ROOM TEMPERATURE AMMONIA SENSING PROPERTIES OF WO3 NANOPARTICLES GROWN BY FACILE PRECIPITATION METHOD

Abstract

Monoclinic cobalt (Co) doped tungsten trioxide (WO3) nanoparticles were prepared by facile precipitation process, and are successfully used as prominent sensing material for room temperature ammonia (NH3) gas detection. XRD, SEM, XPS and PL studies were employed to analyze the structural, morphological, surface chemistry and optical properties of the prepared samples, respectively. The gas sensing measurements disclose that, the sensor fabricated based on Co doped WO3 nanoparticles exhibit superior selectivity and sensitivity towards NH3 gas (S=1692 for 200 ppm, room temperature) with quick response and recovery times of 53 s and 109 s, respectively.