Synthesis and Study of Optical Properties of Graphene/TiO Composites Using UV-VIS Spectroscopy.

Graphene and TiO were synthesized using electrochemical exfoliation and co-precipitation methods, respectively. An ex situ approach was adopted for the graphene/TiO composites. The conformation of graphene in the TiO samples was examined through X-ray diffraction. Optical properties of the as-synthesised composites such as optical absorption, extinction coefficient, refractive index, real dielectric constant, imaginary dielectric constant, dissipation factor, and optical conductivity were measured using UV-Vis spectroscopy. The varying concentration of graphene in TiO affects the optical properties which appear different for 10 wt.% as compared to 5 wt.% graphene/ TiO composite. The composites exhibit an absorption peak at 300 nm with a decrease in band gap for 10 wt.% as compared to 5 wt.% graphene/TiO composite. The maximum optical conductivity for the graphene/TiO composite of 10 wt.% was found to be 1.86·10 Ω·m at 300 nm. [ABSTRACT FROM AUTHOR]