Nanoporous network of nickel oxide for ammonia gas detection

Abstract The nanoporous network of nickel oxide (NiO) thin films have been synthesized by a facile chemical bath deposition method (CBD) at various deposition times. The X-ray diffraction (XRD) patterns of annealed NiO films revealed low intense peaks, confirming nanocrystalline nature with cubic structure. The scanning electron microscopy (SEM) images exhibited well-defined and nanoporous interconnected network. The gas sensing properties of NiO thin films for ammonia gas were investigated. The measurements revealed that the sample deposited at 50 min (Ni 50 ) exhibit better gas sensing performance, due to its high surface area and maximum pore-volume available for gas adsorption.