Oxygen vacancy-rich engineering-optimized molybdenum trioxide microbelts for room-temperature ppb-level trimethylamine detection
Oxygen vacancies in metal oxides play a pivotal role in determining their electronic structure and interfacial redox dynamics. However, their sluggish kinetics and imbalanced adsorption/desorption hinder their performance. Here, we report oxygen vacancy (OV)-rich molybdenum trioxide (MoO3) microbelt...
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| Language: | English |
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Tsinghua University Press
2025-07-01
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| Series: | Journal of Advanced Ceramics |
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| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2025.9221102 |
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| author | Kaidi Wu Zhijie Xu Kaichun Xu Jinyong Xu Yifan Luo Marc Debliquy Chao Zhang |
| author_facet | Kaidi Wu Zhijie Xu Kaichun Xu Jinyong Xu Yifan Luo Marc Debliquy Chao Zhang |
| author_sort | Kaidi Wu |
| collection | DOAJ |
| description | Oxygen vacancies in metal oxides play a pivotal role in determining their electronic structure and interfacial redox dynamics. However, their sluggish kinetics and imbalanced adsorption/desorption hinder their performance. Here, we report oxygen vacancy (OV)-rich molybdenum trioxide (MoO3) microbelts for room-temperature (RT) volatile organic compound (VOC) sensors, effectively overcoming these limitations. Owing to the synergistic effects of a large specific surface area, surface oxygen vacancies, and an optimized electronic structure, exceptional trimethylamine (TMA) sensing performance richs oxygen vacancy-MoO3 (MoO3−x-R), including notably high response, rapid response/recovery, high selectivity, a low limit of detection (400 ppb), and reliable operational stability, was achieved. Experimental and density functional theory studies revealed that controlled oxygen vacancies contribute to tuning the surface redox activity of one-dimensional (1D) MoO3 and regulating the interfacial electron transfer efficiency. Molecular dynamics (MD) simulations revealed that abundant oxygen vacancies in MoO3−x-R enhance its affinity for TMA while weakening its interaction with nitrogen, carbon dioxide, or water vapor. Furthermore, a portable device was developed for quantitative TMA monitoring, enabling rapid and nondestructive detection of fish freshness. This research provides novel perspectives for designing high-performance gas sensors by optimizing the interfacial redox kinetics. |
| format | Article |
| id | doaj-art-72fd4ca667d644ea861ae9269ae3d6ef |
| institution | Kabale University |
| issn | 2226-4108 2227-8508 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Tsinghua University Press |
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| series | Journal of Advanced Ceramics |
| spelling | doaj-art-72fd4ca667d644ea861ae9269ae3d6ef2025-08-20T03:41:14ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082025-07-01147922110210.26599/JAC.2025.9221102Oxygen vacancy-rich engineering-optimized molybdenum trioxide microbelts for room-temperature ppb-level trimethylamine detectionKaidi Wu0Zhijie Xu1Kaichun Xu2Jinyong Xu3Yifan Luo4Marc Debliquy5Chao Zhang6College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, ChinaCollege of Mechanical Engineering, Yangzhou University, Yangzhou 225127, ChinaCollege of Mechanical Engineering, Yangzhou University, Yangzhou 225127, ChinaCollege of Mechanical Engineering, Yangzhou University, Yangzhou 225127, ChinaCollege of Mechanical Engineering, Yangzhou University, Yangzhou 225127, ChinaService de Science des Matériaux, Faculté Polytechnique, Université de Mons, Mons 7000, BelgiumCollege of Mechanical Engineering, Yangzhou University, Yangzhou 225127, ChinaOxygen vacancies in metal oxides play a pivotal role in determining their electronic structure and interfacial redox dynamics. However, their sluggish kinetics and imbalanced adsorption/desorption hinder their performance. Here, we report oxygen vacancy (OV)-rich molybdenum trioxide (MoO3) microbelts for room-temperature (RT) volatile organic compound (VOC) sensors, effectively overcoming these limitations. Owing to the synergistic effects of a large specific surface area, surface oxygen vacancies, and an optimized electronic structure, exceptional trimethylamine (TMA) sensing performance richs oxygen vacancy-MoO3 (MoO3−x-R), including notably high response, rapid response/recovery, high selectivity, a low limit of detection (400 ppb), and reliable operational stability, was achieved. Experimental and density functional theory studies revealed that controlled oxygen vacancies contribute to tuning the surface redox activity of one-dimensional (1D) MoO3 and regulating the interfacial electron transfer efficiency. Molecular dynamics (MD) simulations revealed that abundant oxygen vacancies in MoO3−x-R enhance its affinity for TMA while weakening its interaction with nitrogen, carbon dioxide, or water vapor. Furthermore, a portable device was developed for quantitative TMA monitoring, enabling rapid and nondestructive detection of fish freshness. This research provides novel perspectives for designing high-performance gas sensors by optimizing the interfacial redox kinetics.https://www.sciopen.com/article/10.26599/JAC.2025.9221102oxygen vacancy (ov)-rich engineeringmolybdenum trioxide (moo3)gas sensorroom temperaturevolatile organic compound (voc) detection |
| spellingShingle | Kaidi Wu Zhijie Xu Kaichun Xu Jinyong Xu Yifan Luo Marc Debliquy Chao Zhang Oxygen vacancy-rich engineering-optimized molybdenum trioxide microbelts for room-temperature ppb-level trimethylamine detection Journal of Advanced Ceramics oxygen vacancy (ov)-rich engineering molybdenum trioxide (moo3) gas sensor room temperature volatile organic compound (voc) detection |
| title | Oxygen vacancy-rich engineering-optimized molybdenum trioxide microbelts for room-temperature ppb-level trimethylamine detection |
| title_full | Oxygen vacancy-rich engineering-optimized molybdenum trioxide microbelts for room-temperature ppb-level trimethylamine detection |
| title_fullStr | Oxygen vacancy-rich engineering-optimized molybdenum trioxide microbelts for room-temperature ppb-level trimethylamine detection |
| title_full_unstemmed | Oxygen vacancy-rich engineering-optimized molybdenum trioxide microbelts for room-temperature ppb-level trimethylamine detection |
| title_short | Oxygen vacancy-rich engineering-optimized molybdenum trioxide microbelts for room-temperature ppb-level trimethylamine detection |
| title_sort | oxygen vacancy rich engineering optimized molybdenum trioxide microbelts for room temperature ppb level trimethylamine detection |
| topic | oxygen vacancy (ov)-rich engineering molybdenum trioxide (moo3) gas sensor room temperature volatile organic compound (voc) detection |
| url | https://www.sciopen.com/article/10.26599/JAC.2025.9221102 |
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