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In this work, the ferrite nanocomposite CuxCe$_{0.3-X}$Ni$_{0.7}$Fe$_2$O$_4$is prepared (where: x = 0, 0.05, 0.1, 0.15, 0.2, 0.25) was prepared using theauto combustion technique (sol-gel), and citric acid was utilized as the fuelfor Auto combustion. The results of X-ray diffraction (XRD), emitting fieldscanning electron microscope (FE-SEM), and energy dispersive X-ray analyzer(EDX) tests revealed that the prepared compound has a face-centered cubicstructure (FCC) polycrystalline, and the lattice constant increases with anincrease in the percentage of doping for the copper ion, and decreases for thecerium ion and that the compound is porous, and its molecules are spherical,and there are no additional elements present other than those used in thesynthesis of the compound, indicating that it is of high purity, and thecombination has a high sensitivity to Nitrogen dioxide (NO$_2$) gas, asdetermined by the gas detecting equipment.

Preparation of CuxCe$_{0.3-X}$Ni$_{0.7}$Fe$_2$O$_4$ ferrite nanoparticles as a nitrogen dioxide gas sensor