Iranian Journal of Physics Research

Enhance hydrogen sulfide (H2S) gas sensor based on metal oxide semiconductor (NiO) thin films

Document Type : Original Article

Authors

Radhiyah M Aljarrah
Nawar Rahim

Department of Physics, Faculty of Science, Kufa University, Najaf, Iraq

https://doi.org/10.47176/ijpr.23.3.71530
Abstract
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.

Keywords

AFM
gas sensor
metal oxide semiconductor
operating temperature
sensitivity
Subjects
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