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Article

Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al2O3 Composites Prepared by Atomic Layer Deposition

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Department of Chemistry, Faculty of Electronic Engineering and Technologies, Technical University of Sofia, 8 Kliment Ohridski Blvd, 1756 Sofia, Bulgaria
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Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd, 1784 Sofia, Bulgaria
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Department of Materials Science and Engineering, The Ångström Laboratory, Uppsala University, P.O. Box 35, SE-75103 Uppsala, Sweden
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Department of Microelectronics, Faculty of Electronic Engineering and Technologies, Technical University of Sofia, 8 Kliment Ohridski Blvd, 1756 Sofia, Bulgaria
*
Author to whom correspondence should be addressed.
Academic Editors: Miroslav Miletín and Takashiro Akitsu
Symmetry 2021, 13(8), 1456; https://doi.org/10.3390/sym13081456
Received: 13 July 2021 / Revised: 30 July 2021 / Accepted: 4 August 2021 / Published: 9 August 2021
(This article belongs to the Special Issue Heterogeneous Catalysis: Topics and Advances)
We report on the photocatalytic activity of ZnO layers deposited by atomic layer deposition on a porous anodic aluminum oxide substrate with hexagonal pore symmetry and varied pore dimensions. ZnO/Al2O3 composites were prepared with pore diameters in the range 93–134 nm and interpore distance in the range 185–286 nm, and their photocatalytic activity was measured for gas-phase photocatalytic oxidation of acetaldehyde at varying UV illumination intensities (0.08–3.94 mW cm−2). The results show that substrates with narrower pore diameters (<115 nm, in the case of this study) have a detrimental effect on the photocatalyst performance, despite their higher effective surface. The results are explained on the basis of limited mass transfer inside the porous structure and can be used as a guideline in the purposeful design of photocatalysts with a nanoporous or nanotubular structure. View Full-Text
Keywords: photocatalysis; anodic aluminum oxide; zinc oxide; acetaldehyde; photocatalytic activity photocatalysis; anodic aluminum oxide; zinc oxide; acetaldehyde; photocatalytic activity
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MDPI and ACS Style

Stefanov, B.I.; Blagoev, B.S.; Österlund, L.; Tzaneva, B.R.; Angelov, G.V. Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al2O3 Composites Prepared by Atomic Layer Deposition. Symmetry 2021, 13, 1456. https://doi.org/10.3390/sym13081456

AMA Style

Stefanov BI, Blagoev BS, Österlund L, Tzaneva BR, Angelov GV. Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al2O3 Composites Prepared by Atomic Layer Deposition. Symmetry. 2021; 13(8):1456. https://doi.org/10.3390/sym13081456

Chicago/Turabian Style

Stefanov, Bozhidar I., Blagoy S. Blagoev, Lars Österlund, Boriana R. Tzaneva, and George V. Angelov 2021. "Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al2O3 Composites Prepared by Atomic Layer Deposition" Symmetry 13, no. 8: 1456. https://doi.org/10.3390/sym13081456

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