Síntesis de partículas nanométricas y submicrométricas de dióxido de titanio (TiO2) para la formación de películas nanoestructuradas

Abstract

An important application of titanium dioxide (TiO2) nanoparticles is in solar cells, especially in dye-sensitized (DSSC), where TiO2 forms a film that carries the electrons generated by the dye. The intermediate layer must be a film sufficiently porous to come into contact with the pigment and will depend on the ratio of polyethylene glycol /TiO2 in the film. The nanometric and submicron particles of TiO2 were synthesized by the sol-gel method, while the screen printing pastes were made by mixing the particles with polyethylene glycol, water, α-terpineol and acetic acid. The characterization of the particles consisted in the determination of the size and the crystalline structure of the particles of TiO2, while the characterization of the porous TiO2 film consisted of the determination of the morphological characteristics, crystalline structure, absorbance capacity, adhesion of the film to the substrate and the thickness of the deposited layers. The TiO2 films obtained showed high porosity, absence of cracks and cracking, good adhesion and high resistance to current flow.