Impedance characterisation of NiO based gas sensor

Nickel oxide, NiO is a perspective metal oxide with the ability to detect hazardous and flammable gasses. The detection process is based on the change of the conductivity of the NiO layer upon the presence of the gas. To tune the sensing properties of NiO sensor, it is necessary to obtain more comprehensive understanding of current transport processes in the structure. In this paper, we present an impedance characterization of NiO based sensor, which allowed to distinguish three conduction mechanism responsible for the current flow in the structure.