Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors
Metal oxide/reduced graphene oxide (RGO) heterojunctions have been widely used to fabricate room-temperature gas sensors due to large specific surface areas of RGO nanosheets and enhanced carrier separation efficiency at the interface. However, the sheet stacking of RGO nanosheets limits the full ut...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2019-08-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fmats.2019.00195/full |
| _version_ | 1811200019429064704 |
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| author | Cheng Zou Jing Hu Yanjie Su Feng Shao Zejun Tao Tingting Huo Zhihua Zhou Nantao Hu Zhi Yang Eric Siu-Wai Kong Yafei Zhang |
| author_facet | Cheng Zou Jing Hu Yanjie Su Feng Shao Zejun Tao Tingting Huo Zhihua Zhou Nantao Hu Zhi Yang Eric Siu-Wai Kong Yafei Zhang |
| author_sort | Cheng Zou |
| collection | DOAJ |
| description | Metal oxide/reduced graphene oxide (RGO) heterojunctions have been widely used to fabricate room-temperature gas sensors due to large specific surface areas of RGO nanosheets and enhanced carrier separation efficiency at the interface. However, the sheet stacking of RGO nanosheets limits the full utilization of metal oxide/RGO heterojunctions. Herein, we demonstrate a high-performance room-temperature NO2 gas sensor based on 3D Fe3O4@RGO p-n heterojunctions with a core-shell structure, which were synthesized by self-assembly method and further reduction. The effects of different Fe3O4/RGO ratios and the relative humidity on the sensing performances have been investigated. The experimental results suggest that the 3D Fe3O4@RGO sensor exhibits a good selectivity and high sensitivity of 183.1% for 50 ppm NO2, which is about 8.17 times higher than that of the pure 2D RGO sensor. When exposed to 50 ppb of NO2, the response value still reaches 17.8%. This enhanced sensing performance is mainly ascribed to the formed heterojunctions and the larger surface area of RGO nanosheets. This 2D to 3D heterostructure strategy provides a general route to fabricating ultrahigh-performance room-temperature RGO-based gas sensors. |
| first_indexed | 2024-04-12T01:57:46Z |
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| id | doaj.art-254d1d2696244b6f9be3c72d49d785f5 |
| institution | Directory Open Access Journal |
| issn | 2296-8016 |
| language | English |
| last_indexed | 2024-04-12T01:57:46Z |
| publishDate | 2019-08-01 |
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| record_format | Article |
| series | Frontiers in Materials |
| spelling | doaj.art-254d1d2696244b6f9be3c72d49d785f52022-12-22T03:52:46ZengFrontiers Media S.A.Frontiers in Materials2296-80162019-08-01610.3389/fmats.2019.00195474247Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 SensorsCheng Zou0Jing Hu1Yanjie Su2Feng Shao3Zejun Tao4Tingting Huo5Zhihua Zhou6Nantao Hu7Zhi Yang8Eric Siu-Wai Kong9Yafei Zhang10Key Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaSchool of Chemistry, Biology and Materials Engineering, Research Center for Nanophotonic and Nanoelectronic Materials, Suzhou University of Science and Technology, Suzhou, ChinaKey Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaKey Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaKey Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaKey Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaKey Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaKey Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaKey Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaKey Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaKey Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaMetal oxide/reduced graphene oxide (RGO) heterojunctions have been widely used to fabricate room-temperature gas sensors due to large specific surface areas of RGO nanosheets and enhanced carrier separation efficiency at the interface. However, the sheet stacking of RGO nanosheets limits the full utilization of metal oxide/RGO heterojunctions. Herein, we demonstrate a high-performance room-temperature NO2 gas sensor based on 3D Fe3O4@RGO p-n heterojunctions with a core-shell structure, which were synthesized by self-assembly method and further reduction. The effects of different Fe3O4/RGO ratios and the relative humidity on the sensing performances have been investigated. The experimental results suggest that the 3D Fe3O4@RGO sensor exhibits a good selectivity and high sensitivity of 183.1% for 50 ppm NO2, which is about 8.17 times higher than that of the pure 2D RGO sensor. When exposed to 50 ppb of NO2, the response value still reaches 17.8%. This enhanced sensing performance is mainly ascribed to the formed heterojunctions and the larger surface area of RGO nanosheets. This 2D to 3D heterostructure strategy provides a general route to fabricating ultrahigh-performance room-temperature RGO-based gas sensors.https://www.frontiersin.org/article/10.3389/fmats.2019.00195/fullFe3O4@RGO heterojuntionsNO2 sensorelectrostatic self-assembly methodheterostructuresthree-dimensional core-shell structure |
| spellingShingle | Cheng Zou Jing Hu Yanjie Su Feng Shao Zejun Tao Tingting Huo Zhihua Zhou Nantao Hu Zhi Yang Eric Siu-Wai Kong Yafei Zhang Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors Frontiers in Materials Fe3O4@RGO heterojuntions NO2 sensor electrostatic self-assembly method heterostructures three-dimensional core-shell structure |
| title | Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors |
| title_full | Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors |
| title_fullStr | Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors |
| title_full_unstemmed | Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors |
| title_short | Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors |
| title_sort | three dimensional fe3o4 reduced graphene oxide heterojunctions for high performance room temperature no2 sensors |
| topic | Fe3O4@RGO heterojuntions NO2 sensor electrostatic self-assembly method heterostructures three-dimensional core-shell structure |
| url | https://www.frontiersin.org/article/10.3389/fmats.2019.00195/full |
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