Gas sensing mechanism of ZnO: Na nanocrystals at room temperature using surface photovoltage spectroscopy
ZnO nanocrystals with different Na doping concentrations were prepared on PET flexible substrates sputtered with Au/Ti interdigital electrodes by a simple sol gel method. The relationship between the photoassisted room temperature NO2 gas sensing mechanism and surface photovoltage was explored by ch...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2024-02-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2022.000167 |
| _version_ | 1797294075135655936 |
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| author | LONG Xiaoqin HAVAN Aren WANG Zhan LIANG Yuqing PINGTE Wusha WANG Ziqiang SUN Yifei YU Fei YUAN Huan |
| author_facet | LONG Xiaoqin HAVAN Aren WANG Zhan LIANG Yuqing PINGTE Wusha WANG Ziqiang SUN Yifei YU Fei YUAN Huan |
| author_sort | LONG Xiaoqin |
| collection | DOAJ |
| description | ZnO nanocrystals with different Na doping concentrations were prepared on PET flexible substrates sputtered with Au/Ti interdigital electrodes by a simple sol gel method. The relationship between the photoassisted room temperature NO2 gas sensing mechanism and surface photovoltage was explored by characterizing the microstructure and optical properties of the sample. The X-ray diffraction (XRD) results show that all samples have the hexagonal wurtzite structure, and Na doping does not exhibit diffraction peaks of Na and its oxides. The room temperature gas sensitivity test results show that Na doped ZnO nanocrystals have excellent room temperature gas sensitivity performance, and 0.94 mg/m3 NO2 is detected, which significantly improves the gas sensitivity response compared to pure ZnO nanocrystals. The experimental results of surface photovoltage spectroscopy (SPV) and ultraviolet visible spectrophotometer (UV-vis) indicate that the room temperature gas sensitivity of doped ZnO samples may be related to their surface defect content and defect energy levels. Na doping can significantly enhance the separation of photo generated charges, while also introducing more oxygen defects (Vo) and active sites to promote the reaction between NO2 gas and surface adsorbed ionized oxygen defects. In addition, the blue shift of the optical bandgap and the newly generated defect energy levels further enhance the sensitivity of NO2 gas. |
| first_indexed | 2024-03-07T21:24:53Z |
| format | Article |
| id | doaj.art-6e428e2183bc470eb9a348b3aa02ff3a |
| institution | Directory Open Access Journal |
| issn | 1001-4381 |
| language | zho |
| last_indexed | 2024-03-07T21:24:53Z |
| publishDate | 2024-02-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj.art-6e428e2183bc470eb9a348b3aa02ff3a2024-02-27T06:40:15ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43812024-02-0152221822610.11868/j.issn.1001-4381.2022.00016720240221Gas sensing mechanism of ZnO: Na nanocrystals at room temperature using surface photovoltage spectroscopyLONG Xiaoqin0HAVAN Aren1WANG Zhan2LIANG Yuqing3PINGTE Wusha4WANG Ziqiang5SUN Yifei6YU Fei7YUAN Huan8School of Electronic Information, Southwest Minzu University, Chengdu 610041, ChinaSchool of Electronic Information, Southwest Minzu University, Chengdu 610041, ChinaSchool of Electronic Information, Southwest Minzu University, Chengdu 610041, ChinaSchool of Electronic Information, Southwest Minzu University, Chengdu 610041, ChinaSchool of Electronic Information, Southwest Minzu University, Chengdu 610041, ChinaSchool of Electronic Information, Southwest Minzu University, Chengdu 610041, ChinaSchool of Electronic Information, Southwest Minzu University, Chengdu 610041, ChinaSchool of Electronic Information, Southwest Minzu University, Chengdu 610041, ChinaSchool of Electronic Information, Southwest Minzu University, Chengdu 610041, ChinaZnO nanocrystals with different Na doping concentrations were prepared on PET flexible substrates sputtered with Au/Ti interdigital electrodes by a simple sol gel method. The relationship between the photoassisted room temperature NO2 gas sensing mechanism and surface photovoltage was explored by characterizing the microstructure and optical properties of the sample. The X-ray diffraction (XRD) results show that all samples have the hexagonal wurtzite structure, and Na doping does not exhibit diffraction peaks of Na and its oxides. The room temperature gas sensitivity test results show that Na doped ZnO nanocrystals have excellent room temperature gas sensitivity performance, and 0.94 mg/m3 NO2 is detected, which significantly improves the gas sensitivity response compared to pure ZnO nanocrystals. The experimental results of surface photovoltage spectroscopy (SPV) and ultraviolet visible spectrophotometer (UV-vis) indicate that the room temperature gas sensitivity of doped ZnO samples may be related to their surface defect content and defect energy levels. Na doping can significantly enhance the separation of photo generated charges, while also introducing more oxygen defects (Vo) and active sites to promote the reaction between NO2 gas and surface adsorbed ionized oxygen defects. In addition, the blue shift of the optical bandgap and the newly generated defect energy levels further enhance the sensitivity of NO2 gas.http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2022.000167znodopingsurface photovoltage spectroscopygas sensinginterdigital electrode |
| spellingShingle | LONG Xiaoqin HAVAN Aren WANG Zhan LIANG Yuqing PINGTE Wusha WANG Ziqiang SUN Yifei YU Fei YUAN Huan Gas sensing mechanism of ZnO: Na nanocrystals at room temperature using surface photovoltage spectroscopy Cailiao gongcheng zno doping surface photovoltage spectroscopy gas sensing interdigital electrode |
| title | Gas sensing mechanism of ZnO: Na nanocrystals at room temperature using surface photovoltage spectroscopy |
| title_full | Gas sensing mechanism of ZnO: Na nanocrystals at room temperature using surface photovoltage spectroscopy |
| title_fullStr | Gas sensing mechanism of ZnO: Na nanocrystals at room temperature using surface photovoltage spectroscopy |
| title_full_unstemmed | Gas sensing mechanism of ZnO: Na nanocrystals at room temperature using surface photovoltage spectroscopy |
| title_short | Gas sensing mechanism of ZnO: Na nanocrystals at room temperature using surface photovoltage spectroscopy |
| title_sort | gas sensing mechanism of zno na nanocrystals at room temperature using surface photovoltage spectroscopy |
| topic | zno doping surface photovoltage spectroscopy gas sensing interdigital electrode |
| url | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2022.000167 |
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