Green Synthesis and Characterization of Nickel Tungsten Bimetallic Oxide Nanoparticles via Microwave Irradiation Technique

Abstract

Nickel tungsten bimetallic oxide nanoparticles were synthesised in ethylene glycol using microwave irradiation technique. Nickel and tungsten oxide nanoparticles were synthesised separately using microwave assisted polyol synthesis method. The respective systems are combined together in ratio 1:1 molar and are subjected to microwave irradiation to get Ni-W bimetallic oxide. The structure and composition of nanoparticles were characterised by UV-Visible Spectroscopy, FT-IR Spectroscopy, X-Ray Diffraction (XRD), Energy Dispersion Spectroscopy (EDS), Transmission Electron Microscopy (TEM), Photoluminescence Spectroscopy (PL) and Magnetic Susceptibility measurements. From the XRD and FTIR measurements, nanocrystalline Wolframite structure of Ni-W bimetallic oxide nanoparticles was established. The emperical formula of the nanoparticle is found as Ni0.4W0.6O2.6. The composition may be varied by changing the ratio of Ni and W. A maximum absorbance of 385nm was obtained in UV-Visible spectrum and three emission peaks were obtained in the visible region of photoluminescent studies. Further studies can be done on the catalytic and electrochromic properties of the substance.