Estudio de la separación de carga eléctrica fotogenerada en estructuras de dióxido de titanio-puntos cuánticos de grafeno dopados con fósforo.

Abstract

Study of charge transfer in titanium dioxide (TiO2) nanoparticles doped with graphene quantum dots (GQD) and phosphorus-doped graphene quantum dots (PGQD). Anatase-phase TiO2 nanoparticles were synthesized from TiOSO4 by the sol-gel method, while GQDs and PGQDs were synthesized from mechanically exfoliated graphene. The synthesized materials were characterized by Ultraviolet visible, infrared, X-ray incident emitted photoelectron and X-ray diffraction spectroscopy. While the electrochemical characterization was performed by cyclic voltammetry and electrochemical impedance spectroscopy. The synthesis method allowed the surface adsorption of GQD on the surface of TiO2 nanoparticles. Cyclic voltammetry measurements showed an increase in the area of the voltammograms by over 60% for both no light, uv and visible light, while electrochemical impedance spectroscopy measurements allowed to calculate a 30% increase in the number of charge carriers for GQD-doped TiO2 nanoparticles. Electrochemical characterization revealed that doping TiO2 nanoparticles with GQD improves charge transfer, as the number of carriers increases.