Preparation and study of electrophysical and optical properties of TiO2-GO nanocomposite material

Abstract

Nanocomposite material TiO2–GO was synthesized by hydrothermal method. The formation of nanocomposite was confirmed by FTIR analysis. It is shown that the functional groups characteristic of graphene oxide partially disappear in TiO2–GO, which indicates its partial reduction during synthesis. In addition, the appearance of a wide band below 1000 сm-1 also indicates the formation of bonds between TiO2 and GO. EDS analysis showed the presence of titanium, oxygen and carbon in the powder of nanocomposite material. Raman spectra of nanocomposite contain peaks typical for both TiO2 and graphene oxide. Measurements of the optical characteristics of the synthesized material showed that the absorption spectrum of the nanocomposite shifted in the long-wave region relative to the absorption spectrum of the original components, which may be the result of changes in the band gap of the semiconductor. Measurements of electrophysical characteristics showed that the resistance to electronic transport of nanocomposite material is much less than the value of this parameter obtained for pure TiO2, which leads to an increase in the efficiency of the photocurrent conversion.