Green synthesis of NiO nanoparticles using Aloe Vera extract

In recent years, there is an emerging interest to synthesize nanoparticles of Ni due to their superior properties and application in various fields like sensors, memory storage devices, photocatalytic and catalysis [1-2]. In recent years, nanoparticles are synthesized using plant extract . Plant extracts not only acts as a fuel, but also as capping agents and renders a coordination action capturing the metal ion in the amylose helix in well defined sites. Present research work focused on to synthesis of NiO nanoparticles from leave extract of Aloe Vera plant using Green synthesis method. To synthesis the NiO nanoparticles, dissolve 1.0 M of NiCl2.6H2O in 100 ml of distilled water. Added leaves extract dropwise under constant stirring upto achieve pH of solution became 7. The mixture was subjected to stirring for 8 hours continuously. In this process nano particles were formed, afterwards separate this nanoparticles using what man filterpaper and washed the materials with water repeatedly to remove the by-products. The nanoparticles were dried at 110°C for overnight and calcinedat 700°C for 5 hours. The obtained NiO nanoparticles have been characterized by DRS, XRD, FTIR and SEM. The appearance of a sharp band at 460 cm−1 in the FTIR spectrum confirms the synthesis of NiO (Fig.1).The XRD results showed that the product is pure and has good crystallinity with cubic structure(Fig.2). The particle size calculated from XRD was in the range 37-44 nm. SEM image reveals the uniformity of the average particles size and shape of the obtained NiO nanoparticles (Fig.3). DRS spectrum reveals a characteristic absorption peak of NiO at wavelength of 359 nm, which can be assigned to the intrinsic band-gap absorption of NiO due to the electron transitions from the valence band to the conduction band.