Gas sensing performance of sprayed NiO thin films toward NO2 gas

Nickel oxide thin films were obtained by a cost-effective chemical spray pyrolysis approach on glass substrates using nickel chloride as starting precursor with different deposition times. The X-ray diffraction investigation indicated that the obtained films were polycrystalline cubic structure with preferred orientation along (111) plane. Scanning electron microscopy images for sprayed NiO layers at deposition time of 5 and 10 min exhibit a...