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Wettability and photodegradation activity of sol–gel dip-coated zinc oxide films

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Abstract

The hydrophilic characteristics of zinc oxide combined with the electronic properties of this width band gap semi-conductor were used to produce transparent, anti fog and photocatalytic porous films by using a simple sol–gel dip-coating process. The observed values of contact angles (near to 10°) and calculated spreading coefficients (close to zero) indicate that sol–gel dip-coated ZnO porous films show excellent wettability. The photocatalytic behavior of these films measured from methylene blue degradation is dependent on the film thickness in agreement with wettability results; as the film thickness increases from 0.1 ± 0.05 to 0.5 ± 0.05 the photocatalytic reaction rate constant increases from 0.9 × 10−3 to 5.5 × 10−3 min−1.

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Acknowledgments

This work has been financially supported by CAPES, CNPQ and FAPESP.

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Authors and Affiliations

  1. Chemistry Institute, University Estadual Paulista, R. Prof. Francisco Degni, 55 Zip Code, Araraquara, SP, 14800-900, Brazil

    Marlon Nunes da Silva, Celso V. Santilli & Sandra H. Pulcinelli

  2. Instituto de Química, UNESP, POBox 355, Araraquara, SP, CEP14801-970, Brazil

    Marlon Nunes da Silva, Celso V. Santilli & Sandra H. Pulcinelli

Authors
  1. Marlon Nunes da Silva
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  2. Celso V. Santilli
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  3. Sandra H. Pulcinelli
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Correspondence to Sandra H. Pulcinelli.

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da Silva, M.N., Santilli, C.V. & Pulcinelli, S.H. Wettability and photodegradation activity of sol–gel dip-coated zinc oxide films. J Sol-Gel Sci Technol 63, 230–234 (2012). https://doi.org/10.1007/s10971-012-2721-y

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  • DOI: https://doi.org/10.1007/s10971-012-2721-y

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