Characteristics and photocatalytic activity of highly c -axis-oriented ZnO thin films
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ORIGINAL PAPER: SOL–GEL AND HYBRID MATERIALS FOR CATALYTIC, PHOTOELECTROCHEMICAL AND SENSOR APPLICATIONS
Characteristics and photocatalytic activity of highly c-axis-oriented ZnO thin films Didik Aryanto 1 Erna Hastuti2 Melda Taspika1 Khoirul Anam2 Isnaeni Isnaeni1 Wahyu B. Widayatno1 Agus S. Wismogroho1 Putut Marwoto3 Bebeh W. Nuryadin4 Alfian Noviyanto5,6 Sugianto Sugianto3 ●
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Received: 17 May 2020 / Accepted: 30 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
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.
* Didik Aryanto [email protected] 1
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Research Center for Physics, Indonesian Institute of Sciences, Kawasan Puspitek Serpong, Gd. 440-442, Tangerang Selatan, Banten 15314, Indonesia Department of Physics, Faculty of Science and Technology, UIN Maulana Malik Ibrahim, Jl Gajayana No. 50, Malang 65144, Indonesia
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Department of Physics, Universitas Negeri Semarang, SekaranGunungpati, Semarang 50229, Indonesia
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Department of Physics, Universitas Islam Negeri Sunan Gunung Jati Bandung, Jl. A. H. Nasution 105, Bandung 40614, Indonesia
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Nano Center Indonesia, Jl. Puspiptek, Tangerang Selatan, Banten 15314, Indonesia
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Department of Mechanical Engineering, Mercubuana University, Jl. Meruya Selatan, Kebun Jeruk, Jakarta 11650, Indonesia
Journal of Sol-Gel Science and Technology
Graphical Abstract
Keywords
ZnO thin film Photocatalysis c-axis orientation Photocatalytic activity ●
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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.
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