Triana Dwi Restika and R. Ratnawulan, “Effect of Tetraethoxysilane Addition to Coconut Coir Ash Nanosilica on Morphology and Particle Size of SiO2-TiO2 Nanocomposite”, Department of Physics, Universitas Negeri Padang, vol. 2, no. 1, Mar. 2024.