Photocatalytic activity and biocide effect of nanostructured SnO2/ZnO/TiO2 thin film heterostructure obtained by sol-gel spin coating technique

An oxide-based thin film heterostructure was produced using the sol-gel method. A layered structure composed of the semiconductor oxides SnO2, ZnO and TiO2 was achieved through spin coating technique. The obtained samples were characterized by X-ray diffraction (XRD), field emission scanning electro...

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Bibliographic Details
Published in:Ceramics international 2024-09, Vol.50 (18), p.34421-34430
Main Authors: Paniagua-Méndez, J., Ramírez-Sandoval, S.L., Reyes-Uribe, E., Contreras-García, M.E.
Format: Article
Language:English
Subjects:
Oxide
Photocatalyst
Sol-gel
Spin coating
Thin films
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Summary:An oxide-based thin film heterostructure was produced using the sol-gel method. A layered structure composed of the semiconductor oxides SnO2, ZnO and TiO2 was achieved through spin coating technique. The obtained samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FEG-SEM), energy dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM) and UV–Vis spectroscopy. The thin film heterostructure exhibits a homogeneous surface, free from defects, cracks or delamination. Nanometric grains and nanofibers conform the surface, and a uniform submicronic film thickness was achieved. High values of optical transmission (>83 %), and band gap values were estimated from their absorption spectra. The photocatalytic activity was determinated through the degradation of the methylene blue dye (MB). The assessment of the biocidal effect of the film against Escherichia coli and Staphylococcus aureus bacteria demonstrated significant bactericidal properties.
ISSN:0272-8842
DOI:10.1016/j.ceramint.2024.06.261