Highly sensitive NO2 gas sensors based on heterostructured p-rGO/n-Ga2O3 nanorods
In this study, using a sensing membrane composed of p-type reduced graphene oxide (rGO)-decorated hydrothermally synthesized n-type gallium oxide (Ga2O3) nanorods, nitrogen dioxide (NO2) gas sensors were successfully fabricated. The characteristics of the rGO-decorated Ga2O3 nanorods were analyzed b...
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Elsevier
2025-01-01
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| Series: | Applied Surface Science Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666523924001077 |
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| author | Hsin-Ying Lee Mu-Ju Wu Shao-Yu Chu Ting-Chun Chang Yi-Feng Tung Tsung-Han Yeh Ching-Ting Lee |
| author_facet | Hsin-Ying Lee Mu-Ju Wu Shao-Yu Chu Ting-Chun Chang Yi-Feng Tung Tsung-Han Yeh Ching-Ting Lee |
| author_sort | Hsin-Ying Lee |
| collection | DOAJ |
| description | In this study, using a sensing membrane composed of p-type reduced graphene oxide (rGO)-decorated hydrothermally synthesized n-type gallium oxide (Ga2O3) nanorods, nitrogen dioxide (NO2) gas sensors were successfully fabricated. The characteristics of the rGO-decorated Ga2O3 nanorods were analyzed by X-ray photoelectron spectroscopy (XPS). The experimental results indicated that the rGO decoration on the surface of the Ga2O3 nanorods increased the amount of gas adsorption sites and oxygen vacancies, thereby enhancing electrical conductivity. Consequently, compared to NO2 gas sensors utilizing only Ga2O3 nanorods, the NO2 gas sensors using rGO-decorated Ga2O3 nanorod sensing membrane exhibited lower resistance, reduced activation energy, and higher response. Optimal response, reaching 51.14, was achieved by decorating with 15 mg of rGO. Additionally, the response and recovery times of the NO2 gas sensors were shortened with an increase in the amount of rGO decoration on the Ga2O3 nanorods. This improvement could be attributed to the trend of lower activation energy associated with an increased amount of rGO decoration. This study demonstrates the efficacy of rGO decoration in improving the performance of Ga2O3 nanorod-based NO2 gas sensors. |
| format | Article |
| id | doaj-art-02324d6466ef4840aca30c5997824bbf |
| institution | Kabale University |
| issn | 2666-5239 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Applied Surface Science Advances |
| spelling | doaj-art-02324d6466ef4840aca30c5997824bbf2025-01-29T05:02:06ZengElsevierApplied Surface Science Advances2666-52392025-01-0125100679Highly sensitive NO2 gas sensors based on heterostructured p-rGO/n-Ga2O3 nanorodsHsin-Ying Lee0Mu-Ju Wu1Shao-Yu Chu2Ting-Chun Chang3Yi-Feng Tung4Tsung-Han Yeh5Ching-Ting Lee6Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan, Republic of China; Program on Key Materials, Academy of Innovative Semiconductor and Sustainable Manufacturing, National Cheng Kung University, Tainan 701, Taiwan, Republic of China; Meta-nanoPhotonics Center, National Cheng Kung University, Tainan 701, Taiwan, Republic of China; Corresponding authors at: Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan, Republic of China.Program on Key Materials, Academy of Innovative Semiconductor and Sustainable Manufacturing, National Cheng Kung University, Tainan 701, Taiwan, Republic of ChinaDepartment of Photonics, National Cheng Kung University, Tainan 701, Taiwan, Republic of ChinaDepartment of Photonics, National Cheng Kung University, Tainan 701, Taiwan, Republic of ChinaDepartment of Photonics, National Cheng Kung University, Tainan 701, Taiwan, Republic of ChinaDepartment of Electrical and Electronic Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan, Republic of ChinaDepartment of Photonics, National Cheng Kung University, Tainan 701, Taiwan, Republic of China; Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University, Tainan 701, Taiwan, Republic of China; Department of Electrical Engineering, Yuan Ze University, Taoyuan 320, Taiwan, Republic of China; Corresponding authors at: Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan, Republic of China.In this study, using a sensing membrane composed of p-type reduced graphene oxide (rGO)-decorated hydrothermally synthesized n-type gallium oxide (Ga2O3) nanorods, nitrogen dioxide (NO2) gas sensors were successfully fabricated. The characteristics of the rGO-decorated Ga2O3 nanorods were analyzed by X-ray photoelectron spectroscopy (XPS). The experimental results indicated that the rGO decoration on the surface of the Ga2O3 nanorods increased the amount of gas adsorption sites and oxygen vacancies, thereby enhancing electrical conductivity. Consequently, compared to NO2 gas sensors utilizing only Ga2O3 nanorods, the NO2 gas sensors using rGO-decorated Ga2O3 nanorod sensing membrane exhibited lower resistance, reduced activation energy, and higher response. Optimal response, reaching 51.14, was achieved by decorating with 15 mg of rGO. Additionally, the response and recovery times of the NO2 gas sensors were shortened with an increase in the amount of rGO decoration on the Ga2O3 nanorods. This improvement could be attributed to the trend of lower activation energy associated with an increased amount of rGO decoration. This study demonstrates the efficacy of rGO decoration in improving the performance of Ga2O3 nanorod-based NO2 gas sensors.http://www.sciencedirect.com/science/article/pii/S2666523924001077Gallium oxide nanorodsNitrogen dioxide gas sensorsp-n Heterojunction structureReduced graphene oxideX-ray photoelectron spectroscopy |
| spellingShingle | Hsin-Ying Lee Mu-Ju Wu Shao-Yu Chu Ting-Chun Chang Yi-Feng Tung Tsung-Han Yeh Ching-Ting Lee Highly sensitive NO2 gas sensors based on heterostructured p-rGO/n-Ga2O3 nanorods Applied Surface Science Advances Gallium oxide nanorods Nitrogen dioxide gas sensors p-n Heterojunction structure Reduced graphene oxide X-ray photoelectron spectroscopy |
| title | Highly sensitive NO2 gas sensors based on heterostructured p-rGO/n-Ga2O3 nanorods |
| title_full | Highly sensitive NO2 gas sensors based on heterostructured p-rGO/n-Ga2O3 nanorods |
| title_fullStr | Highly sensitive NO2 gas sensors based on heterostructured p-rGO/n-Ga2O3 nanorods |
| title_full_unstemmed | Highly sensitive NO2 gas sensors based on heterostructured p-rGO/n-Ga2O3 nanorods |
| title_short | Highly sensitive NO2 gas sensors based on heterostructured p-rGO/n-Ga2O3 nanorods |
| title_sort | highly sensitive no2 gas sensors based on heterostructured p rgo n ga2o3 nanorods |
| topic | Gallium oxide nanorods Nitrogen dioxide gas sensors p-n Heterojunction structure Reduced graphene oxide X-ray photoelectron spectroscopy |
| url | http://www.sciencedirect.com/science/article/pii/S2666523924001077 |
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