R. O. . Abdulsada and T. A. . Hassan, “Synthesis of TiO2 Thin Films Nanoparticles with Different Layers using Simple Sol-Gel Method”, Iraqi Journal of Science, vol. 62, no. 11, pp. 4425–4429, Dec. 2021, doi: 10.24996/ijs.2021.62.11(SI).23.