Abstract
<title>Abstract</title> <p> The aim of this study carried out is to enhance the sensing performance of the pure material through a doping strategy. Ammonia is one of the toxic gases present in the atmosphere, released mostly from industries and agricultural pesticides, which leads to serious health issues when inhaled. A semiconducting metal oxide sensor based on a chemi-resistive mechanism is a well-known candidate in the field of sensing and detecting vapours. BaSnO <sub>3</sub> , an established oxide perovskite material because of its versatility and flexible properties. Undoped and nickel-doped BaSnO <sub>3</sub> (BaSn <sub>1-x</sub> Ni <sub>x</sub> O <sub>3</sub> , x = 0.1, 0.3M) samples were prepared via solid-state reaction. The synthesized powder sample was then coated onto a glass substrate through the spin-coating technique. The XRD pattern confirms the cubic perovskite structure. FESEM micrographs reveal the porous nature and smaller particle size with moderate agglomeration. BET analysis found a high surface area and appreciable pore diameter. The gas sensing performance towards ammonia was successfully evaluated. With a lower limit of detection, the sample exhibited a high response voltage at an operating temperature of 300 °C. Additionally, it also provides enhanced sensitivity, good selectivity, excellent repeatability and high stability over a period of time, which are major parameters required for a gas sensor. Comparatively, BaSnO <sub>3</sub> doped with a low molar concentration of nickel has exhibited superior performance over other samples. So, it is highly recommended for Chemi-resistive gas sensing application in detection of ammonia. </p>