The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 23 3 2023 11 22 Enhance hydrogen sulfide (H2S) gas sensor based on metal oxide semiconductor (NiO) thin films Enhance hydrogen sulfide (H2S) gas sensor based on metal oxide semiconductor (NiO) thin films 59 65 3433 10.47176/ijpr.23.3.71530 FA Radhiyah M Aljarrah Department of Physics, Faculty of Science, Kufa University, Najaf, Iraq Nawar Rahim Department of Physics, Faculty of Science, Kufa University, Najaf, Iraq Journal Article 2022 07 18 The morphological and structural properties of NiO films have been studied to find out the possibility of exploit (exploiting) it as a gas sensor. The thin film of the nickel oxide has been obtained by a chemical spray pyrolysis technique on glass substrates using various concentrations of nickel nitrate hexahydrate [Ni(NO₃)₂:6H₂O] aqueous solution. The produced films were characterized using X-Ray diffraction and atomic force microscopy. The investigations revealed that the crystal structure are a cubic polycrystalline with preferential orientation along the (111) plane. The topographical analyse (AFM) shows that the values of the grain size increasing with increase the concentration, where average of the grain diameter raised from 42.04-110.058 nm of 0.01 M  and  0.1M concentrations respectively. The gas sensing results demonstrate that sensitivity of nickel  oxide semiconductor films to the hydrogen sulfide gas are affected by the size of the growing crystallites and the operating temperature. The morphological and structural properties of NiO films have been studied to find out the possibility of exploit (exploiting) it as a gas sensor. The thin film of the nickel oxide has been obtained by a chemical spray pyrolysis technique on glass substrates using various concentrations of nickel nitrate hexahydrate [Ni(NO₃)₂:6H₂O] aqueous solution. The produced films were characterized using X-Ray diffraction and atomic force microscopy. The investigations revealed that the crystal structure are a cubic polycrystalline with preferential orientation along the (111) plane. The topographical analyse (AFM) shows that the values of the grain size increasing with increase the concentration, where average of the grain diameter raised from 42.04-110.058 nm of 0.01 M  and  0.1M concentrations respectively. The gas sensing results demonstrate that sensitivity of nickel  oxide semiconductor films to the hydrogen sulfide gas are affected by the size of the growing crystallites and the operating temperature. https://ijpr.iut.ac.ir/article_3433_fc1032e37dc9f38a1c253e784a667e41.pdf