Comparative Study: Catalytic Activity and Rhodamine Dye Luminescence at the Surface of TiO<sub>2</sub>-Based Nanoheterostructures
Nanoheterostructures based on titanium, molybdenum, tungsten, and vanadium nanooxides with symmetric crystal structures, morphologies and high photocatalytic activity in under illumination by visible light, have been synthesized and studied. Microscopy, optical spectroscopy, and electron-spin resona...
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MDPI AG
2021-09-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/13/9/1758 |
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| author | Elizaveta Konstantinova Vladimir Zaitsev Artem Marikutsa Alexander Ilin |
| author_facet | Elizaveta Konstantinova Vladimir Zaitsev Artem Marikutsa Alexander Ilin |
| author_sort | Elizaveta Konstantinova |
| collection | DOAJ |
| description | Nanoheterostructures based on titanium, molybdenum, tungsten, and vanadium nanooxides with symmetric crystal structures, morphologies and high photocatalytic activity in under illumination by visible light, have been synthesized and studied. Microscopy, optical spectroscopy, and electron-spin resonance techniques were used. The asymmetric separation of photo-generated holes and electrons between different nanooxides in their nanoheterostructures suppresses their recombination. Using the method developed by the authors and based on ESR spectroscopy, the energy levels of the active centers inside the band gaps of the studied samples were found. We have shown, for the first time, that under illumination of nanoheterostructures under asymmetric conditions with adsorbed rhodamine dye at the dye-absorption wavelength (500 nm), photocatalytic reactions are mainly determined by light absorption by the nanostructures themselves, and not by energy transfer from the dye. This important result shows that high photocatalytic activity of materials with symmetric crystal structures is the primary criterion for creating energy-efficient photocatalysts. The results will be useful for the development of energy-efficient catalytic devices based on various combinations of metal nanooxides. |
| first_indexed | 2024-03-10T07:10:52Z |
| format | Article |
| id | doaj.art-b81ac225cd2e4639ade36c708c648227 |
| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-10T07:10:52Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Symmetry |
| spelling | doaj.art-b81ac225cd2e4639ade36c708c6482272023-11-22T15:29:35ZengMDPI AGSymmetry2073-89942021-09-01139175810.3390/sym13091758Comparative Study: Catalytic Activity and Rhodamine Dye Luminescence at the Surface of TiO<sub>2</sub>-Based NanoheterostructuresElizaveta Konstantinova0Vladimir Zaitsev1Artem Marikutsa2Alexander Ilin3Physics Department, Lomonosov Moscow State University, 119991 Moscow, RussiaPhysics Department, Lomonosov Moscow State University, 119991 Moscow, RussiaChemistry Department, Lomonosov Moscow State University, 119991 Moscow, RussiaPhysics Department, Lomonosov Moscow State University, 119991 Moscow, RussiaNanoheterostructures based on titanium, molybdenum, tungsten, and vanadium nanooxides with symmetric crystal structures, morphologies and high photocatalytic activity in under illumination by visible light, have been synthesized and studied. Microscopy, optical spectroscopy, and electron-spin resonance techniques were used. The asymmetric separation of photo-generated holes and electrons between different nanooxides in their nanoheterostructures suppresses their recombination. Using the method developed by the authors and based on ESR spectroscopy, the energy levels of the active centers inside the band gaps of the studied samples were found. We have shown, for the first time, that under illumination of nanoheterostructures under asymmetric conditions with adsorbed rhodamine dye at the dye-absorption wavelength (500 nm), photocatalytic reactions are mainly determined by light absorption by the nanostructures themselves, and not by energy transfer from the dye. This important result shows that high photocatalytic activity of materials with symmetric crystal structures is the primary criterion for creating energy-efficient photocatalysts. The results will be useful for the development of energy-efficient catalytic devices based on various combinations of metal nanooxides.https://www.mdpi.com/2073-8994/13/9/1758titanium dioxidenanoheterostructuresadsorbed dye moleculesspin centersphotosensitivityphotocatalysis |
| spellingShingle | Elizaveta Konstantinova Vladimir Zaitsev Artem Marikutsa Alexander Ilin Comparative Study: Catalytic Activity and Rhodamine Dye Luminescence at the Surface of TiO<sub>2</sub>-Based Nanoheterostructures Symmetry titanium dioxide nanoheterostructures adsorbed dye molecules spin centers photosensitivity photocatalysis |
| title | Comparative Study: Catalytic Activity and Rhodamine Dye Luminescence at the Surface of TiO<sub>2</sub>-Based Nanoheterostructures |
| title_full | Comparative Study: Catalytic Activity and Rhodamine Dye Luminescence at the Surface of TiO<sub>2</sub>-Based Nanoheterostructures |
| title_fullStr | Comparative Study: Catalytic Activity and Rhodamine Dye Luminescence at the Surface of TiO<sub>2</sub>-Based Nanoheterostructures |
| title_full_unstemmed | Comparative Study: Catalytic Activity and Rhodamine Dye Luminescence at the Surface of TiO<sub>2</sub>-Based Nanoheterostructures |
| title_short | Comparative Study: Catalytic Activity and Rhodamine Dye Luminescence at the Surface of TiO<sub>2</sub>-Based Nanoheterostructures |
| title_sort | comparative study catalytic activity and rhodamine dye luminescence at the surface of tio sub 2 sub based nanoheterostructures |
| topic | titanium dioxide nanoheterostructures adsorbed dye molecules spin centers photosensitivity photocatalysis |
| url | https://www.mdpi.com/2073-8994/13/9/1758 |
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