Optical, structural, and morphological properties of photocatalytic TiO2-ZnO thin films synthesized by the sol-gel process

M. Pérez-González, S. A. Tomás, M. Morales-Luna, M. A. Arvizu, M. M. Tellez-Cruz

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

(TiO2)1 - x-(ZnO)x thin films, with x = 0.00, 0.25, 0.50, 0.75, and 1.00, were deposited on glass substrates by the sol-gel process. Pure TiO2 and ZnO thin films were synthesized from titanium isopropoxide-based and zinc acetate-based precursor solutions, respectively, whereas the composite films were obtained from the mixture of these solutions at specific vol.% ratios. Using the Tauc model, it was determined that the band-gap energy increased from 3.43 eV for the TiO2 thin films up to 3.60 eV for the sample with x = 0.50. With further increase in x, the absorption edges of the films were red-shifted and the band-gap energy decreased down to 3.29 eV for the ZnO thin films. Additionally, the films were evaluated for their ability to degrade methylene blue. The photocatalytic activity of pure ZnO thin films was enhanced by aging the ZnO sol for 48 h. Moreover, it was found that the photocatalytic performance improved by decreasing the x value, with the TiO2 thin films displaying the highest response. These results are explained in terms of the crystallinity and the surface morphology of the (TiO2)1 - x-(ZnO)x thin films.

Original languageEnglish
Pages (from-to)304-309
Number of pages6
JournalThin Solid Films
Volume594
DOIs
Publication statusPublished - 2 Nov 2015
Externally publishedYes

Fingerprint

sol-gel processes
Sol-gel process
optical properties
Thin films
thin films
Energy gap
Zinc Acetate
Methylene Blue
methylene blue
Composite films
Polymethyl Methacrylate
Sols
Surface morphology
acetates
crystallinity
Zinc
titanium
Titanium
zinc
Aging of materials

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Pérez-González, M. ; Tomás, S. A. ; Morales-Luna, M. ; Arvizu, M. A. ; Tellez-Cruz, M. M. / Optical, structural, and morphological properties of photocatalytic TiO2-ZnO thin films synthesized by the sol-gel process. In: Thin Solid Films. 2015 ; Vol. 594. pp. 304-309.
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Optical, structural, and morphological properties of photocatalytic TiO2-ZnO thin films synthesized by the sol-gel process. / Pérez-González, M.; Tomás, S. A.; Morales-Luna, M.; Arvizu, M. A.; Tellez-Cruz, M. M.

In: Thin Solid Films, Vol. 594, 02.11.2015, p. 304-309.

Research output: Contribution to journalArticle

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AB - (TiO2)1 - x-(ZnO)x thin films, with x = 0.00, 0.25, 0.50, 0.75, and 1.00, were deposited on glass substrates by the sol-gel process. Pure TiO2 and ZnO thin films were synthesized from titanium isopropoxide-based and zinc acetate-based precursor solutions, respectively, whereas the composite films were obtained from the mixture of these solutions at specific vol.% ratios. Using the Tauc model, it was determined that the band-gap energy increased from 3.43 eV for the TiO2 thin films up to 3.60 eV for the sample with x = 0.50. With further increase in x, the absorption edges of the films were red-shifted and the band-gap energy decreased down to 3.29 eV for the ZnO thin films. Additionally, the films were evaluated for their ability to degrade methylene blue. The photocatalytic activity of pure ZnO thin films was enhanced by aging the ZnO sol for 48 h. Moreover, it was found that the photocatalytic performance improved by decreasing the x value, with the TiO2 thin films displaying the highest response. These results are explained in terms of the crystallinity and the surface morphology of the (TiO2)1 - x-(ZnO)x thin films.

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