LAUSR

Abstract The two-dimensional (2-D) nanocrystalline NiO nanoparticles were prepared using a chemical route. The prepared NiO material was well characterized and used for sensor device fabrication. The NiO sensor device exhibited a remarkable response for acetaldehyde in the concentration range of 2-100 ppm. The response of the NiO sensor was investigated for acetaldehyde sensing at different operating temperatures. The high response of the sensor device was noted to be 108 % for 100 ppm acetaldehyde concentration at 250 ˚C. The low detection of acetaldehyde was achieved as 3 % response for 2 ppm at 250 ˚C. The selectivity of the sensor was tested among gases such as ethanol, methane, carbon monoxide, carbon dioxide, and acetaldehyde. The real-time sensor’s response was studied for different concentrations of acetaldehyde. The effect of acetaldehyde concentrations on the sensor’s response was analysed. The NiO sensor’s stability was confirmed and the sensing mechanism for acetaldehyde gas was briefed.