Structural and optical properties of Fe doped TiO2 nanoparticles

In this work, Fe doped TiO2 nanoparticles at different Fe/Ti molar ratio from 1 to 10% and different annealing temperature from 400 to 800 oC were investigated by X-ray diffraction spectroscopy, transmission electron microscopy (TEM) and diffuse reflectance spectroscopy (DRS). The size of prepared nanoparticles was estimated between 6 to 100 nm by transmission electron microscopy. The characterization by diffuse reflectance spectroscopy revealed that the optical absorption in the visible region significantly increased by doping of TiO2 nanoparticles.. The calculated gap energy by second derivative of Tauc plot demonstrated that the gap energy decreased to 2.5 eV for samples at higher Fe content and annealing temperature.