Publication

Abstract : This paper presents synthesis and characterization of tungsten oxide (WO3) nanoparticles using EDTA assurfactant by simple household microwave irradiation (2.45 GHz) method. The samples were characterized using powder Xray diffraction (XRD), transmission electron microscopy (TEM) and UV–visible diffusion reflectance spectroscopy (UV–VISDRS). Powder XRD results revealed that both samples prepared with and without surfactant crystallize in the orthorhombic structure corresponding to WO3·H2O phase. Subsequent annealing under identical conditions (600◦ C/air/6 h) led to significantly different products i.e. monoclinic W17O47 from surfactant free sample and similarly monoclinic phase of WO2.72 from EDTA assisted sample. Blue emission was observed through UV–VIS-DRS with band gap energy around 3.28 and 3.47 eV for EDTA assisted samples respectively.