Abstract
Nickel oxide (NiO) thin films were deposited on to the glass substrates via chemical bath deposition (CBD) method at various deposition times of 5, 6, 7 and 8 h. The X-ray diffraction (XRD) study showed the cubic crystal structure of NiO. The field emission scanning electron microscopy (FE-SEM) images exhibit the porous structured morphology composed of randomly oriented nanosheets. The atomic force microscopy (AFM) analysis reveals the maximum surface roughness of 107.9 nm for NiO film deposited at 7 h. The X-ray photoelectron spectroscopy (XPS) study reveals the presence of Ni2+ and Ni3+ chemical states. The transmission electron microscopy (TEM) images reveal an average size of 5 nm for NiO nanocrystalline particles. The nitrogen dioxide (NO2) gas sensing performance was tested at various working temperatures and gas concentrations. The sensing tests showed 45.6 % response to 100 ppm NO2 at 200 °C with Tresponse = 13 s and Trecovery = 146 s.
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