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https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/125577
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| 題名: | Probing size-dependent defects in zinc oxide using synchrotron techniques: impact on photocatalytic efficiency |
| 作者: | A. Kadian, V. Manikandan, K. Dev, V. Kumar, C. J. Yang, B. H. Lin, C. L. Chen, C. L. Dong, K. Asokan, S. Annapoorni |
| 日期: | 2023-09 |
| 上傳時間: | 2024-07-30 12:05:45 (UTC+8) |
| 出版者: | Royal Society of Chemistry |
| 摘要: | In the present study, synchrotron-based X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS) and X-ray excited optical luminescence (XEOL) have been used to investigate the induced defect states in metal oxide nanomaterials. Specifically, two synthesis approaches have been followed to develop unique nano-sized peanut-shaped (N-ZnO) nanostructures and micron-sized hexagonal rods (M-ZnO). XANES analysis at the Zn K-edge revealed the presence of defect states with a divalent oxidation state of zinc (Zn2+) in a tetrahedral structure. Furthermore, XAS measurements performed at the Zn L3,2-edge and O K-edge confirm higher oxygen-related defects in M-ZnO, while N-ZnO appeared to have a higher concentration of surface defects due to size confinement. Moreover, the in-line XEOL and time dependent-XEOL measurements exposed the radiative excitonic recombination phenomena occurring in the band-tailing region as a function of absorption length, X-ray energy excitation, and time. Based on the chronology developed in the defect state improvement, a possible energy band diagram is proposed to accurately locate the defect states in the two systems. Furthermore, the increased absorption intensity at the Zn L3,2-edge and the O K-edge under the UV lamp suggests delayed recombination of electrons and holes, highlighting their potential use as photo catalysts. The photocatalytic activity degrading the rhodamine B dye established M-ZnO as a superior catalyst with a rapid degradation rate and significant mineralization. Overall, this work provides valuable insights into ZnO defect states and provides a foundation for efficient advanced materials for environmental or other optoelectronic applications. |
| 關聯: | Physical Chemistry Chemical Physics 25, p.25639-25653 |
| DOI: | 10.1039/D3CP02923A |
| 顯示於類別: | [電機工程學系暨研究所] 期刊論文
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