"The influence of graphene oxide on the photocatalytic activity of nanocomposite material"

Abstract

"In this paper, is investigated the photocatalytic activity of a nanocomposite material based on titanium and graphene oxides. The sample was obtained by hydrothermal synthesis. The photoactalytic activity of nanocomposites was studied by the transient responce of the photoinduced current. Charge transfer resistances were also investigated using electrochemical impedance spectroscopy. Identification of nanocomposite materials was carried out using Raman and FTIR spectroscopy. This combination shows that there is a connection between the original components. Raman spectroscopy shows that the peaks obtained are characteristic of both titanium dioxide and graphene oxide. At the same time, the ID/IG ratio shows the reduction of graphene oxide during hydrothermal synthesis. And FTIR spectroscopy shows that there is a Ti-O-C bond below the 1000 cm-1 mode. The absorption ability also affects the increase in the photocurrent of the nanocomposite material. Absorption spectra show a shift to the long-wavelength region of light due to the transparency of graphene oxide in the visible region. The concentration of graphene oxide plays an important role in increasing the efficiency of the nanocomposite material. In this work, the concentration of the graphene oxide is equal to 7 wt% with respect to titanium dioxide. Keywords: nanocomposite material, titanium dioxide, graphene oxide, hydrothermal synthesis, photocatalytic activity."