Graphene and TiO2 were synthesized using electrochemical exfoliation and co-precipitation methods, respectively. An ex situ approach was adopted for the graphene/TiO2 composites. The conformation of graphene in the TiO2 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 TiO2 affects the optical properties which appear different for 10 wt.% as compared to 5 wt.% graphene/ TiO2 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/TiO2 composite. The maximum optical conductivity for the graphene/TiO2 composite of 10 wt.% was found to be 1.86·10–2 Ω–1·m–1 at 300 nm.
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Published in Zhurnal Prikladnoi Spektroskopii, Vol. 83, No. 4, pp. 573–578, July–August, 2016.
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Rathod, P.B., Waghuley, S.A. Synthesis and Study of Optical Properties of Graphene/TiO2 Composites Using UV-VIS Spectroscopy. J Appl Spectrosc 83, 586–591 (2016). https://doi.org/10.1007/s10812-016-0332-z
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DOI: https://doi.org/10.1007/s10812-016-0332-z