Synthesis and Characterization of ZnMn2O4 for Gas Sensing Application Using Pulse Laser Deposition Technique

Thin films of ZnMn 2 O 4 were deposited on quartz substrates at 250 °C using the Pulsed Laser Deposition (PLD) technique and then annealed in air at 500 °C for 6 hours. The films were tested for detection of NO 2 and NH 3 at different operating temperatures. The films showed rapid response time is (7.2 s) for NO 2 and (13.5 s) for NH 3 at 300 °C. The upper sensitivity of NH 3 is 15%, while the upper sensitivity of the samples tested with 60ppm NO 2 is 93% at a temperature of around 300°C. Also, the structural properties as X-ray diffraction ( XRD), Field emission scanning electron microscopy (FESEM), and optical properties were studied. Keywords: Gas sensors, pulse laser deposition, PLD, ZnMn 2 O 4 , Sensing properties, optical properties.