Thickness Dependent on Photocatalytic Activity of Hematite Thin Films
Hematite (Fe2O3) thin films with different thicknesses are fabricated by the rf magnetron sputtering deposition. The effects of film thicknesses on the photocatalytic activity of hematite films have been investigated. Hematite films possess a polycrystalline hexagonal structure, and the band gap dec...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2012/980595 |
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| author | Yen-Hua Chen Kuo-Jui Tu |
| author_facet | Yen-Hua Chen Kuo-Jui Tu |
| author_sort | Yen-Hua Chen |
| collection | DOAJ |
| description | Hematite (Fe2O3) thin films with different thicknesses are fabricated by the rf magnetron sputtering deposition. The effects of film thicknesses on the photocatalytic activity of hematite films have been investigated. Hematite films possess a polycrystalline hexagonal structure, and the band gap decreases with an increase of film thickness. Moreover, all hematite films exhibit good photocatalytic ability under visible-light irradiation; the photocatalytic activity of hematite films increases with the increasing film thickness. This is because the hematite film with a thicker thickness has a rougher surface, providing more reaction sites for photocatalysis. Another reason is a lower band gap of a hematite film would generate more electron-hole pairs under visible-light illumination to enhance photocatalytic efficiency. Experimental data are well fitted with Langmuir-Hinshelwood kinetic model. The photocatalytic rate constant of hematite films ranges from 0.052 to 0.068 min-1. This suggests that the hematite film is a superior photocatalyst under visible-light irradiation. |
| format | Article |
| id | doaj-art-af0b8bbf16734717af938f63a62223ef |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-af0b8bbf16734717af938f63a62223ef2025-02-03T01:22:01ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2012-01-01201210.1155/2012/980595980595Thickness Dependent on Photocatalytic Activity of Hematite Thin FilmsYen-Hua Chen0Kuo-Jui Tu1Department of Earth Sciences, National Cheng Kung University, No. 1, University Road, Tainan 701, TaiwanDepartment of Earth Sciences, National Cheng Kung University, No. 1, University Road, Tainan 701, TaiwanHematite (Fe2O3) thin films with different thicknesses are fabricated by the rf magnetron sputtering deposition. The effects of film thicknesses on the photocatalytic activity of hematite films have been investigated. Hematite films possess a polycrystalline hexagonal structure, and the band gap decreases with an increase of film thickness. Moreover, all hematite films exhibit good photocatalytic ability under visible-light irradiation; the photocatalytic activity of hematite films increases with the increasing film thickness. This is because the hematite film with a thicker thickness has a rougher surface, providing more reaction sites for photocatalysis. Another reason is a lower band gap of a hematite film would generate more electron-hole pairs under visible-light illumination to enhance photocatalytic efficiency. Experimental data are well fitted with Langmuir-Hinshelwood kinetic model. The photocatalytic rate constant of hematite films ranges from 0.052 to 0.068 min-1. This suggests that the hematite film is a superior photocatalyst under visible-light irradiation.http://dx.doi.org/10.1155/2012/980595 |
| spellingShingle | Yen-Hua Chen Kuo-Jui Tu Thickness Dependent on Photocatalytic Activity of Hematite Thin Films International Journal of Photoenergy |
| title | Thickness Dependent on Photocatalytic Activity of Hematite Thin Films |
| title_full | Thickness Dependent on Photocatalytic Activity of Hematite Thin Films |
| title_fullStr | Thickness Dependent on Photocatalytic Activity of Hematite Thin Films |
| title_full_unstemmed | Thickness Dependent on Photocatalytic Activity of Hematite Thin Films |
| title_short | Thickness Dependent on Photocatalytic Activity of Hematite Thin Films |
| title_sort | thickness dependent on photocatalytic activity of hematite thin films |
| url | http://dx.doi.org/10.1155/2012/980595 |
| work_keys_str_mv | AT yenhuachen thicknessdependentonphotocatalyticactivityofhematitethinfilms AT kuojuitu thicknessdependentonphotocatalyticactivityofhematitethinfilms |