Multifunctional applications of Nickel oxide (NiO) nanoparticles synthesized by facile green combustion method using Limonia acidissima natural fruit juice

Abstract

Abstract In this work, NiO nanoparticles (NPs) have been effectively synthesized by a simple, efficient and cost effective method using limonia accidissima natural fruit juice as a novel fuel. The synthesized NPs were characterized by XRD, FT-IR, UV-DRS, SEM-EDAX, TEM and PL studies. X-ray diffraction pattern confirms the cubic structured NiO with average crystallite size of 13, 21, 20, 12 and 10\xa0nm. The band at 430\xa0cm−1 in FT-IR indicates the stretching mode of the Ni-O bond. The band gap of the material was found to be 3.4\xa0eV. SEM and TEM analysis reveals that the morphologies are spherical in shape and having the particle size about 20–25\xa0nm. Surface defects were studied by photoluminescence (PL) spectroscopy. Photocatalytic activities of the synthesised NPs were used to degrade methylene blue dye. The in-depth antioxidant activity of synthesized NPs were analysed by DPPH, ferrous ion and hydroxyl radical methods. Anti angiogenic activity was examined by CAM assay. Finally, NiO NPs were used for the electrochemical sensing of dopamine (DA), which is able to sense up to the detection limit of 11\xa0μM.