Abstract
This research work aims to reduce the band gap of thin layers of titanium oxide by the incorporation of graphene oxide sheets. Thin layers of the TiO2-GO composites were prepared on a glass substrate by the spin-coating technique from GO and an aqueous solution of TiO2. A significant decrease in optical band gap was observed at the TiO2-GO compound compared to that of pure TiO2. Samples as prepared were characterized using XRD, SEM and UV-visible spectra. XRD analysis revealed the amorphous nature of the deposited layers. Scanning electron microscope reveals the dispersion of graphene nanofiles among titanium oxide nanoparticles distributed at the surface with an almost uniform size distribution. The band gap has been calculated and is around 2 eV after incorporation of Graphene oxide. The chemical bond C-Ti between the titanium oxide and graphene sheets is at the origin of this reduction.
Highlights
The Titania, existing in rutile or anatase phase, is considered an important material for different applications because of its characteristic of photoexcitation phenomenon
Thin layers of the TiO2-Graphene oxide (GO) composites were prepared on a glass substrate by the spin-coating technique from GO and an aqueous solution of TiO2
A significant decrease in optical band gap was observed at the TiO2-GO compound compared to that of pure TiO2
Summary
The Titania, existing in rutile or anatase phase, is considered an important material for different applications because of its characteristic of photoexcitation phenomenon. The efficiency of photovoltaic solar cells and photocatalytic devices could be improved if the band gap of titanium oxide layers could be reduced [1] [2]. Titanium oxide (TiO2) has excellent chemical stability, mechanical hardness and optical transmittance with high refractive index. It has attracted great attention these years and it is widely used in solar cells. A Graphene oxide (GO) is explored for its important effect on the band gap of titanium thin layers. In this context, the composites of GO and TiO2 are highly promising. Several studies have been reported in the literature [6] [7] [8] in order to reduce the band gap of TiO2
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