The precursor solution effect on the synthesis, structure, and optical properties of the WO3-TeO2 binary compound

In this paper, two synthesis methods of binary compounds of WO3-TeO2 with different precursors solutions including HNO3 (solution A) and HCl (solution B) have been presented. The effect of nitric acid and hydrochloric acid precursors on the structural and optical properties of WO3-TeO2 compounds have been studied. The results of X-ray diffraction showed that in the solution containing HNO3, a large percentage of TeO2 was transformed to Te during the reaction and for solution containing HCl, the two phases of WO3 and TeO2 are observed. The size of the WO3-TeO2 nanoparticles synthesized with the precursor B is smaller than the other one. The images of the field emission scanning electron microscope (FE-SEM) for solution containing HNO3 showed that the morphology of the produced nanoparticles is hexagonal and tetragonal, while solution containing HCl is uniformly polygon monoclinic structure in form of rod. The results of the FT-IR and UV-Vis spectrometry showed that the bonding structure of nanoparticles in solution containing HNO3 is influenced by environmental factors and affects almost on all the vibrational modes of the WO3-TeO2 composition. The energy gap (E-g) for the synthesized samples with the processors A and B were obtained 3.65 eV and 4.02 eV, respectively.