3D ZnO/ZIF‐8 Hierarchical Nanostructure for Sensitive and Selective NO2 Sensing at Room Temperature
Gas sensors based on semiconductor metal oxides (SMOs) have gained widespread attention for Internet of Things applications; however, high operating temperatures and low gas selectivity limit their applications. Recently, metal–organic frameworks (MOFs) have demonstrated potential in enhancing gas s...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2024-04-01
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| Series: | Small Structures |
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| Online Access: | https://doi.org/10.1002/sstr.202300503 |
| _version_ | 1827291190380199936 |
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| author | Jinho Lee Hongju Lee Tae-Hyun Bae Donghwi Cho Myungwoo Choi Gwangmin Bae Young-Seok Shim Seokwoo Jeon |
| author_facet | Jinho Lee Hongju Lee Tae-Hyun Bae Donghwi Cho Myungwoo Choi Gwangmin Bae Young-Seok Shim Seokwoo Jeon |
| author_sort | Jinho Lee |
| collection | DOAJ |
| description | Gas sensors based on semiconductor metal oxides (SMOs) have gained widespread attention for Internet of Things applications; however, high operating temperatures and low gas selectivity limit their applications. Recently, metal–organic frameworks (MOFs) have demonstrated potential in enhancing gas selectivity through the physical filtration of gas molecules based on their kinetic diameters. However, their application has been predominantly limited to simplistic nanostructured sensors. These sensors exhibit inherently inferior gas sensor performance compared to three‐dimensional nanostructure gas sensors. In this study, a highly periodic, 3D hierarchical ZnO/ZIF‐8 nanostructure is fabricated for photoactivated gas sensing at room temperature. Under UV illumination, the gas sensor exhibited a 17‐fold enhancement in gas response toward 0.1 ppm NO2 compared to pristine ZnO. In addition, the ZIF‐8 coating selectively increased the NO2 gas response compared to ethanol, acetone, and toluene gases, thereby improving the gas selectivity. The gas response improvement by the ZIF‐8 layer coating, which has not been achieved by previous studies, is based on enhanced photoactivation by the solid interaction between ZIF‐8 and ZnO. These results provide a systematic background for controlling the layer thickness of SMO‐MOF nanostructures and the catalytic role of MOF in photoactivated gas sensing. |
| first_indexed | 2024-04-24T12:31:36Z |
| format | Article |
| id | doaj.art-483b4198e5d649a4b809935d421b83a4 |
| institution | Directory Open Access Journal |
| issn | 2688-4062 |
| language | English |
| last_indexed | 2024-04-24T12:31:36Z |
| publishDate | 2024-04-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Small Structures |
| spelling | doaj.art-483b4198e5d649a4b809935d421b83a42024-04-08T02:35:51ZengWiley-VCHSmall Structures2688-40622024-04-0154n/an/a10.1002/sstr.2023005033D ZnO/ZIF‐8 Hierarchical Nanostructure for Sensitive and Selective NO2 Sensing at Room TemperatureJinho Lee0Hongju Lee1Tae-Hyun Bae2Donghwi Cho3Myungwoo Choi4Gwangmin Bae5Young-Seok Shim6Seokwoo Jeon7Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of KoreaDepartment of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of KoreaDepartment of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of KoreaThin Film Materials Research Center Korea Research Institute of Chemical Technology Yuseong Daejeon 34114 Republic of KoreaDepartment of Materials Science and Engineering Korea University Seoul 02841 Republic of KoreaDepartment of Materials Science and Engineering Korea University Seoul 02841 Republic of KoreaSchool of Energy, Materials & Chemical Engineering Korea University of Technology and Education Cheonan 31253 Republic of KoreaDepartment of Materials Science and Engineering Korea University Seoul 02841 Republic of KoreaGas sensors based on semiconductor metal oxides (SMOs) have gained widespread attention for Internet of Things applications; however, high operating temperatures and low gas selectivity limit their applications. Recently, metal–organic frameworks (MOFs) have demonstrated potential in enhancing gas selectivity through the physical filtration of gas molecules based on their kinetic diameters. However, their application has been predominantly limited to simplistic nanostructured sensors. These sensors exhibit inherently inferior gas sensor performance compared to three‐dimensional nanostructure gas sensors. In this study, a highly periodic, 3D hierarchical ZnO/ZIF‐8 nanostructure is fabricated for photoactivated gas sensing at room temperature. Under UV illumination, the gas sensor exhibited a 17‐fold enhancement in gas response toward 0.1 ppm NO2 compared to pristine ZnO. In addition, the ZIF‐8 coating selectively increased the NO2 gas response compared to ethanol, acetone, and toluene gases, thereby improving the gas selectivity. The gas response improvement by the ZIF‐8 layer coating, which has not been achieved by previous studies, is based on enhanced photoactivation by the solid interaction between ZIF‐8 and ZnO. These results provide a systematic background for controlling the layer thickness of SMO‐MOF nanostructures and the catalytic role of MOF in photoactivated gas sensing.https://doi.org/10.1002/sstr.2023005033D nanostructureshierarchical 3D nanostructureslight-activated gas sensorsmetal oxide/metal organic framework nanostructuresroom temperature gas sensors |
| spellingShingle | Jinho Lee Hongju Lee Tae-Hyun Bae Donghwi Cho Myungwoo Choi Gwangmin Bae Young-Seok Shim Seokwoo Jeon 3D ZnO/ZIF‐8 Hierarchical Nanostructure for Sensitive and Selective NO2 Sensing at Room Temperature Small Structures 3D nanostructures hierarchical 3D nanostructures light-activated gas sensors metal oxide/metal organic framework nanostructures room temperature gas sensors |
| title | 3D ZnO/ZIF‐8 Hierarchical Nanostructure for Sensitive and Selective NO2 Sensing at Room Temperature |
| title_full | 3D ZnO/ZIF‐8 Hierarchical Nanostructure for Sensitive and Selective NO2 Sensing at Room Temperature |
| title_fullStr | 3D ZnO/ZIF‐8 Hierarchical Nanostructure for Sensitive and Selective NO2 Sensing at Room Temperature |
| title_full_unstemmed | 3D ZnO/ZIF‐8 Hierarchical Nanostructure for Sensitive and Selective NO2 Sensing at Room Temperature |
| title_short | 3D ZnO/ZIF‐8 Hierarchical Nanostructure for Sensitive and Selective NO2 Sensing at Room Temperature |
| title_sort | 3d zno zif 8 hierarchical nanostructure for sensitive and selective no2 sensing at room temperature |
| topic | 3D nanostructures hierarchical 3D nanostructures light-activated gas sensors metal oxide/metal organic framework nanostructures room temperature gas sensors |
| url | https://doi.org/10.1002/sstr.202300503 |
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