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Characteristics and photocatalytic activity of highly c-axis-oriented ZnO thin films

  • Original Paper: Sol–gel and hybrid materials for catalytic, photoelectrochemical and sensor applications
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Abstract

ZnO thin films are deposited on glass substrate using sol–gel spin coating methods with various annealing temperatures. The structural, morphological, and optical properties are studied by XRD, FE-SEM, UV–Vis, and photoluminescence spectrophotometer. The photocatalytic activity was assessed by examining the decomposition of Rhodamine-B (Rh-B) dye under UV illumination. The result shows that the ZnO films have a hexagonal wurtzite structure with highly preferred c-axis orientation. The (101) crystallographic plane appears at higher annealing temperatures. The transmittance of ZnO films is more than 80%, with a slight red shift in absorption and decrease in the optical band gaps as the annealing temperature increases to some extent. The photoluminescence spectra of the ZnO films at room temperature demonstrated the ultra-violet (UV) emission with a peak emission at 410 nm (3.03 eV). According to the photocatalytic activity examination, the presence of (101) plane in the c-axis oriented ZnO films enhances the photocatalytic performance by a factor of 5. The result revealed that ZnO films with multi-orientation structure possess better photocatalytic performance than that of the single-orientation ones. In particular, the photocatalytic performance is highly contributed by the polar crystal plane and slightly improved by the crystallinity and surface morphology.

Highlights

  • ZnO films with highly preferred c-axis orientation were prepared using sol–gel spin coating technique.

  • The ZnO films have a transmittance more than 80% with an ultra-violet (UV) emission peak at 3.03 eV.

  • The polar crystal plane gives more significant contribution on the photocatalytic performance than that of the crystallinity and surface morphology.

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Acknowledgements

This research was supported by Ministry of Research, Technology and Higher Education, Indonesia under Grant No. 013/P/RPL-LIPI/INSINAS-2/VII/2018. The authors acknowledge Research Center for Physics-LIPI for providing the research facilities.

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Authors and Affiliations

  1. Research Center for Physics, Indonesian Institute of Sciences, Kawasan Puspitek Serpong, Gd. 440-442, Tangerang Selatan, Banten, 15314, Indonesia

    Didik Aryanto, Melda Taspika, Isnaeni Isnaeni, Wahyu B. Widayatno & Agus S. Wismogroho

  2. Department of Physics, Faculty of Science and Technology, UIN Maulana Malik Ibrahim, Jl Gajayana No. 50, Malang, 65144, Indonesia

    Erna Hastuti & Khoirul Anam

  3. Department of Physics, Universitas Negeri Semarang, Sekaran-Gunungpati, Semarang, 50229, Indonesia

    Putut Marwoto & Sugianto Sugianto

  4. Department of Physics, Universitas Islam Negeri Sunan Gunung Jati Bandung, Jl. A. H. Nasution 105, Bandung, 40614, Indonesia

    Bebeh W. Nuryadin

  5. Nano Center Indonesia, Jl. Puspiptek, Tangerang Selatan, Banten, 15314, Indonesia

    Alfian Noviyanto

  6. Department of Mechanical Engineering, Mercubuana University, Jl. Meruya Selatan, Kebun Jeruk, Jakarta, 11650, Indonesia

    Alfian Noviyanto

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  1. Didik Aryanto
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Aryanto, D., Hastuti, E., Taspika, M. et al. Characteristics and photocatalytic activity of highly c-axis-oriented ZnO thin films. J Sol-Gel Sci Technol 96, 226–235 (2020). https://doi.org/10.1007/s10971-020-05361-5

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  • DOI: https://doi.org/10.1007/s10971-020-05361-5

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