Modified Sol-Gel Processing of NiCr۲O۴ Nanoparticles; StructuralAnalysis and Optical Band Gap

Nickel Chromite nanoparticles were successfully synthesized via a modified sol-gelmethod using nickel acetate and ammonium dichromate in melted stearic acid as acomplexing agent. The diffractograms of the nanoparticles confirmed a pure formation ofNiCr۲O۴ spinel without any minor phase. The coordination structure of as preparednanoparticles shows a series of absorption bands below ۱,۰۰۰ cm-۱ were evidenced the M-O(Cr-O, Ni-O) bond in the sample. Optical band gap, magnetic properties and color parameters(L*.a*.b*) indicates that the final nanoparticles are optically and magnetically active. Theparticle size of NiCr۲O۴ was calculated using Scherrer equation at about ۲۴ nm. Optical bandgap obtained at ۱.۷ eV indicating that NiCr۲O۴ nanoparticles are semiconductor material andcan be used in electrical devices

کلیدواژه ها:

NiCr۲O۴ spinel ، optical band gap ، sol-gel ، nanoparticles