Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al<sub>2</sub>O<sub>3</sub> Composites Prepared by Atomic Layer Deposition
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/Al<sub>2</sub>O<sub>3</sub> composites were prepared with pore diameters in the...
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MDPI AG
2021-08-01
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| author | Bozhidar I. Stefanov Blagoy S. Blagoev Lars Österlund Boriana R. Tzaneva George V. Angelov |
| author_facet | Bozhidar I. Stefanov Blagoy S. Blagoev Lars Österlund Boriana R. Tzaneva George V. Angelov |
| author_sort | Bozhidar I. Stefanov |
| collection | DOAJ |
| description | 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/Al<sub>2</sub>O<sub>3</sub> 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<sup>−2</sup>). 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. |
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| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-10T08:20:42Z |
| publishDate | 2021-08-01 |
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| spelling | doaj.art-a6019533ecf24769a7929a3d0ff13e192023-11-22T10:01:46ZengMDPI AGSymmetry2073-89942021-08-01138145610.3390/sym13081456Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al<sub>2</sub>O<sub>3</sub> Composites Prepared by Atomic Layer DepositionBozhidar I. Stefanov0Blagoy S. Blagoev1Lars Österlund2Boriana R. Tzaneva3George V. Angelov4Department of Chemistry, Faculty of Electronic Engineering and Technologies, Technical University of Sofia, 8 Kliment Ohridski Blvd, 1756 Sofia, BulgariaGeorgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd, 1784 Sofia, BulgariaDepartment of Materials Science and Engineering, The Ångström Laboratory, Uppsala University, P.O. Box 35, SE-75103 Uppsala, SwedenDepartment of Chemistry, Faculty of Electronic Engineering and Technologies, Technical University of Sofia, 8 Kliment Ohridski Blvd, 1756 Sofia, BulgariaDepartment of Microelectronics, Faculty of Electronic Engineering and Technologies, Technical University of Sofia, 8 Kliment Ohridski Blvd, 1756 Sofia, BulgariaWe 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/Al<sub>2</sub>O<sub>3</sub> 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<sup>−2</sup>). 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.https://www.mdpi.com/2073-8994/13/8/1456photocatalysisanodic aluminum oxidezinc oxideacetaldehydephotocatalytic activity |
| spellingShingle | Bozhidar I. Stefanov Blagoy S. Blagoev Lars Österlund Boriana R. Tzaneva George V. Angelov Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al<sub>2</sub>O<sub>3</sub> Composites Prepared by Atomic Layer Deposition Symmetry photocatalysis anodic aluminum oxide zinc oxide acetaldehyde photocatalytic activity |
| title | Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al<sub>2</sub>O<sub>3</sub> Composites Prepared by Atomic Layer Deposition |
| title_full | Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al<sub>2</sub>O<sub>3</sub> Composites Prepared by Atomic Layer Deposition |
| title_fullStr | Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al<sub>2</sub>O<sub>3</sub> Composites Prepared by Atomic Layer Deposition |
| title_full_unstemmed | Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al<sub>2</sub>O<sub>3</sub> Composites Prepared by Atomic Layer Deposition |
| title_short | Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al<sub>2</sub>O<sub>3</sub> Composites Prepared by Atomic Layer Deposition |
| title_sort | effects of anodic aluminum oxide substrate pore geometry on the gas phase photocatalytic activity of zno al sub 2 sub o sub 3 sub composites prepared by atomic layer deposition |
| topic | photocatalysis anodic aluminum oxide zinc oxide acetaldehyde photocatalytic activity |
| url | https://www.mdpi.com/2073-8994/13/8/1456 |
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