Journal
OPTICAL MATERIALS
Volume 133, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2022.113065
Keywords
TiO2; Tungsten doping; Spray pyrolysis; Photo catalytic activity; Urbach energy
Categories
Funding
- Bangladesh University of Engineering and Technology
Ask authors/readers for more resources
In this study, pristine and tungsten-doped titanium dioxide thin films were prepared using a spray pyrolysis technique. The surface morphology of the films showed a mixed structure of particles and reticulated fibers. The optical band gap of the films decreased due to the incorporation of tungsten, and the 6% tungsten-doped films exhibited the highest degradation efficiency.
In this study, pristine titanium dioxide (TiO2) and tungsten (W) doped TiO2 (W: TiO2) thin films with concen-trations of 2, 4, 6 and 8 at. % has been deposited on a soda lime glass substrate at 450 degrees C using a simple spray pyrolysis (SP) technique. The surface morphology of TiO2 and W: TiO2 thin films showed a mixed phases of particle and reticulated fiber nature as observed by the field emission scanning electron microscopy (FESEM). The average size of the particles was found to be 1.094 mu m and the thickness of the reticulated fiber varies between 0.230 and 0.651 mu m. Energy dispersive X-ray (EDX) analysis demonstrate stoichiometric distribution of Ti, W, and O elements in the as-deposited films. Ultraviolet-visible (UV-Vis) spectroscopy was used to estimate the optical band gap of the thin films and was found to be decreased monotonically from 3.36 eV to 3.02 eV due to the incorporation of W into the TiO2 thin films. The effect of W-doping on the variation of edge potentials of the conduction bands (CB) and valence bands (VB) of the TiO2 thin films were studied. Furthermore, the effect of W-doping on the degradation of the methylene blue (MB) under UV-light illumination was studied. 6 at. % W: TiO2 thin films demonstrate the highest degradation efficiency (76%) among all the samples. This can be attributed to the reduction of electron-hole recombination due to reduced band gap together with production of adsorption sites at the cylindrical pores of the thin films.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available