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Enhanced electrical and photocatalytic properties of porous TiO2 thin films decorated with Fe2O3 nanoparticles
Ist Teil von
Journal of materials science. Materials in electronics, 2020-12, Vol.31 (23), p.20753-20773
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2020
Link zum Volltext
Quelle
SpringerLink
Beschreibungen/Notizen
In this work, we developed a facile synthetic process for the fabrication of porous heterojunction Fe
2
O
3
/TiO
2
using a two-step method to be employed as a visible light photocatalyst. In the first step, porous TiO
2
thin films were successfully prepared by a sol–gel method using polyethylene glycol (PEG). The porous TiO
2
thin film was further annealed and then decorated with nanoparticles of Fe
2
O
3
using the direct electrodeposition method. The photocatalysts were structurally investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD) and Raman spectroscopy. The Fe
2
O
3
/TiO
2
heterojunction presented both an anatase TiO
2
phase and rhombohedric structure of hematite α-Fe
2
O
3.
The optical properties have been investigated for all the materials, in which the TiO
2
material present in porous heterojunction exhibited a remarkable absorption and red shift in the visible region from 3.2 to 3.0 eV compared to the pure heterojunction Fe
2
O
3
/TiO
2
. Moreover, the electrochemical behavior of the samples was investigated. Photocatalytic activity was assessed from methylene blue degradation with remarkable degradability performance under visible light. The photodegradation of the porous heterojunction Fe
2
O
3
/TiO
2
exhibited an enhanced photodegradation up to 70% after 150 min of irradiation.