Pure and Nickel oxide doped chromium (III) oxide (Cr2O3) nanoparticals are synthesized by hydrothermal technique. The effect of dopant Ni concentration on the structural behavior of Cr2O3 nanoparticles was examined by X-ray diffraction. The average crystallite size of the synthesized nanoparticles was measured from XRD patterns using Scherrer equation and was decreased from 22nm to 12.9 nm with the increasing Nio concentration in Cr2O3 from (0, 0.01, 0.06, and 0.10). Morphologies and compositional elements of the synthesized nanoparticles were observed by the field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) spectroscopy, respectively. The optical property of the samples was measured by ultraviolet - visible (UV-Vis.) absorption spectroscopy. The observed optical band gap value ranges from 2.3eV to 2.5eV for Ni doped nanoparticles
Pure Cr 2 O 3 and NiO/Cr 2 O 3 nanocomposite were luckily synthesized by simple hydrothermal technique. X-ray films diffraction (XRD), Filed Emission scanning electron microscopy (FESEM), Energy dispersive X-ray spectroscopy (EDS), were used to research the crystalline structures, surface morphologies and nanostructures, and element components and their valences of the assynthesized samples. Moreover, gas sensors based on the synthesized pure Cr 2 O 3 and NiO/ Cr 2 O 3 composites were fabricated and their sensing behavior, to NH 3. Gas sensing experiments reference that the NiO/ Cr 2 O 3 composites showed much higher gas response and lower working temperature than those of pure Cr 2 O 3 . These results assure that the as-synthesized NiO/ Cr 2 O 3 composites a favorable NH 3 sensing material.
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