Carbon Nanosphere-Based TiO<sub>2</sub> Double Inverse Opals
Inverse opals (IOs) are intensively researched in the field of photocatalysis, since their optical properties can be fine-tuned by the initial nanosphere size and material. Another possible route for photonic crystal programming is to stack IOs with different pore sizes. Accordingly, single and doub...
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2025-01-01
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| author | Dániel Attila Karajz Kincső Virág Rottenbacher Klára Hernádi Imre Miklós Szilágyi |
| author_facet | Dániel Attila Karajz Kincső Virág Rottenbacher Klára Hernádi Imre Miklós Szilágyi |
| author_sort | Dániel Attila Karajz |
| collection | DOAJ |
| description | Inverse opals (IOs) are intensively researched in the field of photocatalysis, since their optical properties can be fine-tuned by the initial nanosphere size and material. Another possible route for photonic crystal programming is to stack IOs with different pore sizes. Accordingly, single and double IOs were synthesized using vertical deposition and atomic layer deposition. In the case of the double IOs, the alternating use of the two preparation methods was successfully performed. Hydrothermally synthesized 326 and 458 nm carbon nanospheres were utilized to manufacture two different IOs; hence the name 326 nm and 458 nm IOs. Heat treatment removed the sacrificial template carbon nanospheres, and the as-deposited TiO<sub>2</sub> crystallized upon annealing into nanocrystalline anatase form. Reflectance mode UV–visible spectroscopy showed that most IOs had photonic properties, i.e., a photonic band gap, and by the “slow” photon effect enhanced absorbance, except the 326 nm IO, even though it also had an increase in absorbance. The IOs were tested by photocatalytic degradation of Rhodamine 6-G under visible light. Photocatalytic experiments showed that the 458 nm IO was more active and the double IOs showed higher efficiency compared to monolayers, even if the less effective 326 nm IO was the top layer. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| spelling | doaj-art-fcbac1577e364d1cbc7a7996e10dcc0d2025-01-24T13:43:06ZengMDPI AGMolecules1420-30492025-01-0130220510.3390/molecules30020205Carbon Nanosphere-Based TiO<sub>2</sub> Double Inverse OpalsDániel Attila Karajz0Kincső Virág Rottenbacher1Klára Hernádi2Imre Miklós Szilágyi3Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, HungaryDepartment of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, HungaryInstitute of Physical Metallurgy, Metal Forming and Nanotechnology, University of Miskolc, H-3515 Miskolc, HungaryInstitute of Physical Metallurgy, Metal Forming and Nanotechnology, University of Miskolc, H-3515 Miskolc, HungaryInverse opals (IOs) are intensively researched in the field of photocatalysis, since their optical properties can be fine-tuned by the initial nanosphere size and material. Another possible route for photonic crystal programming is to stack IOs with different pore sizes. Accordingly, single and double IOs were synthesized using vertical deposition and atomic layer deposition. In the case of the double IOs, the alternating use of the two preparation methods was successfully performed. Hydrothermally synthesized 326 and 458 nm carbon nanospheres were utilized to manufacture two different IOs; hence the name 326 nm and 458 nm IOs. Heat treatment removed the sacrificial template carbon nanospheres, and the as-deposited TiO<sub>2</sub> crystallized upon annealing into nanocrystalline anatase form. Reflectance mode UV–visible spectroscopy showed that most IOs had photonic properties, i.e., a photonic band gap, and by the “slow” photon effect enhanced absorbance, except the 326 nm IO, even though it also had an increase in absorbance. The IOs were tested by photocatalytic degradation of Rhodamine 6-G under visible light. Photocatalytic experiments showed that the 458 nm IO was more active and the double IOs showed higher efficiency compared to monolayers, even if the less effective 326 nm IO was the top layer.https://www.mdpi.com/1420-3049/30/2/205inverse opalatomic layer depositionphotocatalysis |
| spellingShingle | Dániel Attila Karajz Kincső Virág Rottenbacher Klára Hernádi Imre Miklós Szilágyi Carbon Nanosphere-Based TiO<sub>2</sub> Double Inverse Opals Molecules inverse opal atomic layer deposition photocatalysis |
| title | Carbon Nanosphere-Based TiO<sub>2</sub> Double Inverse Opals |
| title_full | Carbon Nanosphere-Based TiO<sub>2</sub> Double Inverse Opals |
| title_fullStr | Carbon Nanosphere-Based TiO<sub>2</sub> Double Inverse Opals |
| title_full_unstemmed | Carbon Nanosphere-Based TiO<sub>2</sub> Double Inverse Opals |
| title_short | Carbon Nanosphere-Based TiO<sub>2</sub> Double Inverse Opals |
| title_sort | carbon nanosphere based tio sub 2 sub double inverse opals |
| topic | inverse opal atomic layer deposition photocatalysis |
| url | https://www.mdpi.com/1420-3049/30/2/205 |
| work_keys_str_mv | AT danielattilakarajz carbonnanospherebasedtiosub2subdoubleinverseopals AT kincsoviragrottenbacher carbonnanospherebasedtiosub2subdoubleinverseopals AT klarahernadi carbonnanospherebasedtiosub2subdoubleinverseopals AT imremiklosszilagyi carbonnanospherebasedtiosub2subdoubleinverseopals |