Thermal Annealing Induced Controllable Porosity and Photoactive Performance of 2D ZnO Sheets
Porous ZnO sheets containing various degrees of a nanoscaled pore were successfully synthesized using a simple hydrothermal method and various postannealing procedures. The porosity features of the ZnO sheets can be easily tuned by changing both the annealing temperature and annealing atmosphere. Th...
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MDPI AG
2020-07-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/7/1352 |
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| author | Yuan-Chang Liang Chen-Shiang Hung Wei-Cheng Zhao |
| author_facet | Yuan-Chang Liang Chen-Shiang Hung Wei-Cheng Zhao |
| author_sort | Yuan-Chang Liang |
| collection | DOAJ |
| description | Porous ZnO sheets containing various degrees of a nanoscaled pore were successfully synthesized using a simple hydrothermal method and various postannealing procedures. The porosity features of the ZnO sheets can be easily tuned by changing both the annealing temperature and annealing atmosphere. The dense porous nature of ZnO sheets is beneficial to enhance light absorption. Moreover, the substantially increased oxygen vacancies in the ZnO sheets were observed especially after the hydrogen treatment as revealed in the X-ray photoelectron spectroscope and photoluminescence analyses. The high density of surface crystal defect enhanced the photoinduced electron-hole separation rate of the ZnO sheets, which is crucial for an improved photoactivity. The porous ZnO sheets formed at a hydrogen atmosphere exhibited superior photoactive performance than the porous ZnO sheets formed at the high-temperature ambient air annealing. The dense pores and massive crystal defects formed by a hydrogen atmosphere annealing in the ZnO crystals might account for the observed photoactive behaviors in this study. |
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| id | doaj.art-af735edc860f4036b631d2e674ac01c3 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T18:32:50Z |
| publishDate | 2020-07-01 |
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| series | Nanomaterials |
| spelling | doaj.art-af735edc860f4036b631d2e674ac01c32023-11-20T06:29:20ZengMDPI AGNanomaterials2079-49912020-07-01107135210.3390/nano10071352Thermal Annealing Induced Controllable Porosity and Photoactive Performance of 2D ZnO SheetsYuan-Chang Liang0Chen-Shiang Hung1Wei-Cheng Zhao2Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, TaiwanDepartment of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, TaiwanDepartment of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, TaiwanPorous ZnO sheets containing various degrees of a nanoscaled pore were successfully synthesized using a simple hydrothermal method and various postannealing procedures. The porosity features of the ZnO sheets can be easily tuned by changing both the annealing temperature and annealing atmosphere. The dense porous nature of ZnO sheets is beneficial to enhance light absorption. Moreover, the substantially increased oxygen vacancies in the ZnO sheets were observed especially after the hydrogen treatment as revealed in the X-ray photoelectron spectroscope and photoluminescence analyses. The high density of surface crystal defect enhanced the photoinduced electron-hole separation rate of the ZnO sheets, which is crucial for an improved photoactivity. The porous ZnO sheets formed at a hydrogen atmosphere exhibited superior photoactive performance than the porous ZnO sheets formed at the high-temperature ambient air annealing. The dense pores and massive crystal defects formed by a hydrogen atmosphere annealing in the ZnO crystals might account for the observed photoactive behaviors in this study.https://www.mdpi.com/2079-4991/10/7/1352ZnOthermal annealingporositycrystalline qualityphotoactive performance |
| spellingShingle | Yuan-Chang Liang Chen-Shiang Hung Wei-Cheng Zhao Thermal Annealing Induced Controllable Porosity and Photoactive Performance of 2D ZnO Sheets Nanomaterials ZnO thermal annealing porosity crystalline quality photoactive performance |
| title | Thermal Annealing Induced Controllable Porosity and Photoactive Performance of 2D ZnO Sheets |
| title_full | Thermal Annealing Induced Controllable Porosity and Photoactive Performance of 2D ZnO Sheets |
| title_fullStr | Thermal Annealing Induced Controllable Porosity and Photoactive Performance of 2D ZnO Sheets |
| title_full_unstemmed | Thermal Annealing Induced Controllable Porosity and Photoactive Performance of 2D ZnO Sheets |
| title_short | Thermal Annealing Induced Controllable Porosity and Photoactive Performance of 2D ZnO Sheets |
| title_sort | thermal annealing induced controllable porosity and photoactive performance of 2d zno sheets |
| topic | ZnO thermal annealing porosity crystalline quality photoactive performance |
| url | https://www.mdpi.com/2079-4991/10/7/1352 |
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