Enhanced Room Temperature Ammonia Gas Sensing Properties of Fe-Doped MoO3 Thin Films Fabricated Using Nebulizer Spray Pyrolysis

Abstract

MoO3 thin films are fabricated using nebulizer spray pyrolysis technique, which is doped with Fe at various concentrations of 1, 2, 3, and 4% for ammonia gas sensors application at room temperature. X-ray diffraction (XRD) study confirms the growth of the crystal by Fe doping up to 3%, nano rods shape morphology of the thin film samples observed by field emission scanning electron microscope (FESEM), reduction in bandgap is evidenced via UV-VIS spectrophotometer. Gas sensing study is performed using gas analyzing chamber attached with Keithley source meter. Since 3% Fe doped MoO3 sample displayed nano rods over the film surface which exhibits highest sensitivity of 38,500%, in a short period of raise and decay time 54 and 6s. Our findings confirms that the 3% Fe doped MoO3 films suitability for ammonia gas sensing application.

Effect of Ce doping on MoO3 thin films for room temperature ammonia sensing application

“…In recent decades, the quality of air has declined alarmingly due to the emissions of hazardous gases from industries, transport vehicles, and forest fires that cause dangerous health effects on living beings [1,2]. To prevent this, a device that can sense air pollution particularly hazardous gas leakages into the normal atmosphere in real time is a hectic task, which made researchers keenly interested to fabricate such devices that is low cost and highly effective [3][4][5]. Ammonia (NH 3 ) is a pungent odour gas that is mostly used as a coolant material in automobile, chemical, food, textile industries, and common base material for the fertilizers [6][7][8].…”