The role of Ag doping in the adjustment of the optical and dielectric properties of TiO2 particles

In this study, Ag-doped titanium dioxide samples with different concentrations have been prepared by sol-sel method. The existence of anatase and rutile in Ag-doped TiO2 is proved and the mineral phase structure of the main host is determined. Furthermore, the presence of the rutile crystal phase and Ag dopants is found to be critical for enhancing the dielectric and optical properties. Infrared spectroscopy is used to identify the presence of functional groups. Ag doping turns out to reduce the band gap and increase the absorption rate by studying the optical properties of Ag-doped TiO2 powders. Based on the results, the principles of dielectric constant, dielectric loss, and AC conductivity as the function of frequency are explained in detail. The studies on the dielectric properties of Ag-doped TiO2 samples have shown that the excellent dielectric property of all samples is obtained when the molar concentration contained in the sample is 5 mol% Ag ions.