Enhanced Photocatalytic Activity of Electrospun β-Ga2O3 Nanofibers via In-Situ Si Doping Using Tetraethyl Orthosilicate
| Autor: | Tae Hee Yoo, In Gyu Lee, Wan Sik Hwang, Heejoong Ryou, Byung Jin Cho |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Band gap photocatalyst Doping 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis Electrospinning 0104 chemical sciences Tetraethyl orthosilicate chemistry.chemical_compound gallium oxide Chemical engineering chemistry Nanofiber silicon doping Photocatalysis methylene blue Physical and Theoretical Chemistry Thin film 0210 nano-technology Photodegradation |
| Zdroj: | Catalysts Volume 9 Issue 12 |
| ISSN: | 2073-4344 |
| DOI: | 10.3390/catal9121005 |
| Popis: | &beta Ga2O3 has attracted considerable attention as an alternative photocatalyst to replace conventional TiO2 under ultraviolet-C irradiation due to its high reduction and oxidation potential. In this study, to enhance the photocatalytic activity of &beta Ga2O3, nanofibers are formed via the electrospinning method, and Si atoms are subsequently doped. As the Si concentration in the &beta Ga2O3 nanofiber increases, the optical bandgap of the &beta Ga2O3 nanofibers continuously decreases from 4.5 eV (intrinsic) to 4.0 eV for the Si-doped (2.4 at. %) &beta Ga2O3 nanofibers, and accordingly, the photocatalytic activity of the &beta Ga2O3 nanofibers is enhanced. This higher photocatalytic performance with Si doping is attributed to the increased doping-induced carriers in the conduction band edges. This differs from the traditional mechanism in which the doping-induced defect sites in the bandgap enhance separation and inhibit the recombination of photon-generated carriers. |
| Databáze: | OpenAIRE |
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