The Surface Behavior of ZnO Films Prepared at Room Temperature
The surface behavior of ZnO-based films can be modulated via the postannealing and ultraviolet (UV) illumination of different strengths and durations, respectively. The present results could provide the basis for modulating their microstructures with respect to the grain-size distribution and photoc...
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MDPI AG
2023-08-01
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| Series: | Journal of Composites Science |
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| Online Access: | https://www.mdpi.com/2504-477X/7/8/335 |
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| author | Da-Hua Wei Sheng-Kai Tong Sheng-Chiang Chen Rong-Tan Huang |
| author_facet | Da-Hua Wei Sheng-Kai Tong Sheng-Chiang Chen Rong-Tan Huang |
| author_sort | Da-Hua Wei |
| collection | DOAJ |
| description | The surface behavior of ZnO-based films can be modulated via the postannealing and ultraviolet (UV) illumination of different strengths and durations, respectively. The present results could provide the basis for modulating their microstructures with respect to the grain-size distribution and photocatalytic behavior, and act as a potential guide in the field of wide-bandgap semiconducting oxides. ZnO films were prepared at room temperature onto Corning-1737 glass substrates by applying radio-frequency magnetron sputtering without supplying an oxygen source. With the purpose of obtaining modulational grain microstructures, the as-prepared ZnO films (Z0) were treated via a postannealing modification in a vacuum furnace at 300 °C for 30 min after deposition (Z300), accompanied by adjustable internal stress. The contact angle (CA) value of the ZnO films was reduced from 95° to 68°, owing to the different grain microstructure accompanied by a change in the size variation. In addition, UV light with different illumination strengths could be used to improve the hydrophilicity, which varied from a hydrophobic status to a superhydrophilic status due to the desirable surface characteristics of its photocatalytic action. In addition, the photocatalytic activity of the ZnO films exhibited an effectual photodegradation of methylene blue (MB) under UV illumination, with a chemical reaction constant of 2.93 × 10<sup>−3</sup> min<sup>−1</sup>. In this present work, we demonstrated that the CA value of the ZnO films not only caused a change from a hydrophobic to hydrophilic status, accompanied by a change in grain size combined with internal stress, but also, induced by the UV light illumination, was combined with photocatalytic activity simultaneously. On the other hand, an enhanced surface plasmonic resonance was observed, which was due to couple oscillations between the electrons and photons and was generated from the interface by using a flat, continuous Pt capping nanolayer. This designed structure may also be considered as a Pt electrode pattern onto ZnO (metal Pt/ceramic ZnO) for multifunctional, heterostructured sensors and devices in the near future. |
| first_indexed | 2024-03-10T23:50:46Z |
| format | Article |
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| issn | 2504-477X |
| language | English |
| last_indexed | 2024-03-10T23:50:46Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Composites Science |
| spelling | doaj.art-b1d8a57b1151484785efc412134ee1812023-11-19T01:42:41ZengMDPI AGJournal of Composites Science2504-477X2023-08-017833510.3390/jcs7080335The Surface Behavior of ZnO Films Prepared at Room TemperatureDa-Hua Wei0Sheng-Kai Tong1Sheng-Chiang Chen2Rong-Tan Huang3Institute of Manufacturing Technology, Department of Mechanical Engineering, National Taipei University of Technology (TAIPEI TECH), Taipei 10608, TaiwanResearch and Development Department, CB-CERATIZIT Group, New Taipei City 24250, TaiwanInstitute of Manufacturing Technology, Department of Mechanical Engineering, National Taipei University of Technology (TAIPEI TECH), Taipei 10608, TaiwanDepartment of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, TaiwanThe surface behavior of ZnO-based films can be modulated via the postannealing and ultraviolet (UV) illumination of different strengths and durations, respectively. The present results could provide the basis for modulating their microstructures with respect to the grain-size distribution and photocatalytic behavior, and act as a potential guide in the field of wide-bandgap semiconducting oxides. ZnO films were prepared at room temperature onto Corning-1737 glass substrates by applying radio-frequency magnetron sputtering without supplying an oxygen source. With the purpose of obtaining modulational grain microstructures, the as-prepared ZnO films (Z0) were treated via a postannealing modification in a vacuum furnace at 300 °C for 30 min after deposition (Z300), accompanied by adjustable internal stress. The contact angle (CA) value of the ZnO films was reduced from 95° to 68°, owing to the different grain microstructure accompanied by a change in the size variation. In addition, UV light with different illumination strengths could be used to improve the hydrophilicity, which varied from a hydrophobic status to a superhydrophilic status due to the desirable surface characteristics of its photocatalytic action. In addition, the photocatalytic activity of the ZnO films exhibited an effectual photodegradation of methylene blue (MB) under UV illumination, with a chemical reaction constant of 2.93 × 10<sup>−3</sup> min<sup>−1</sup>. In this present work, we demonstrated that the CA value of the ZnO films not only caused a change from a hydrophobic to hydrophilic status, accompanied by a change in grain size combined with internal stress, but also, induced by the UV light illumination, was combined with photocatalytic activity simultaneously. On the other hand, an enhanced surface plasmonic resonance was observed, which was due to couple oscillations between the electrons and photons and was generated from the interface by using a flat, continuous Pt capping nanolayer. This designed structure may also be considered as a Pt electrode pattern onto ZnO (metal Pt/ceramic ZnO) for multifunctional, heterostructured sensors and devices in the near future.https://www.mdpi.com/2504-477X/7/8/335surface behaviorinternal stressultraviolet light strengthphotocatalyticheterostructure |
| spellingShingle | Da-Hua Wei Sheng-Kai Tong Sheng-Chiang Chen Rong-Tan Huang The Surface Behavior of ZnO Films Prepared at Room Temperature Journal of Composites Science surface behavior internal stress ultraviolet light strength photocatalytic heterostructure |
| title | The Surface Behavior of ZnO Films Prepared at Room Temperature |
| title_full | The Surface Behavior of ZnO Films Prepared at Room Temperature |
| title_fullStr | The Surface Behavior of ZnO Films Prepared at Room Temperature |
| title_full_unstemmed | The Surface Behavior of ZnO Films Prepared at Room Temperature |
| title_short | The Surface Behavior of ZnO Films Prepared at Room Temperature |
| title_sort | surface behavior of zno films prepared at room temperature |
| topic | surface behavior internal stress ultraviolet light strength photocatalytic heterostructure |
| url | https://www.mdpi.com/2504-477X/7/8/335 |
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