Single-Crystalline β-Ga2O3 Hexagonal Nanodisks: Synthesis, Growth Mechanism, and Photocatalytic Activities
| Autor: | Heqing Yang, Ruigang Zhang, Ruyu Shi, Jie Yu, Ruini Liu, Lihui Zhang, Hua Zhao, Hairong Zheng |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Photoluminescence chemistry.chemical_element Nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials Metal chemistry.chemical_compound Crystallography General Energy chemistry visual_art Vacancy defect Selective adsorption visual_art.visual_art_medium Methyl orange Photocatalysis Physical and Theoretical Chemistry Gallium Photodegradation |
| Zdroj: | The Journal of Physical Chemistry C. 113:21548-21554 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp905829w |
| Popis: | β-Ga2O3 hexagonal nanodisks were in situ grown on the surface of gallium grain and Si substrate via a reaction of metallic gallium with NH4Cl and H2O at 650−800 °C for 30 min. The as-synthesized nanodisks have perfect hexagonal shape with diagonals of 0.6−4.0 μm and thicknesses of 140−480 nm. Size of the hexagonal nanodisks increased with increasing heat treatment temperature. The formation of the Ga2O3 nanodisks results from the selective adsorption of Cl− ions on unsaturated Ga(I) and Ga(II) sites of β-Ga2O3 (100) surface. Photoluminescence and photocatalytic activity of the hexagonal Ga2O3 nanodisks were studied at room temperature. The results indicated that the hexagonal nanodisks display a stable blue-green emission band centered at 489 nm that originated from the recombination of an electron on an oxygen vacancy and a hole on a gallium−oxygen vacancy pair and high photocatalytic activity in the photodegradation of methyl orange. |
| Databáze: | OpenAIRE |
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