Citation: Jinwu Hu, Feng Wang, Jiejie Yu, Zijun Hong, Wenhui Zhang, Hui-Jun Li, Zhuangchai Lai, Ding Wang, Yonghui Deng, Guisheng Li. MOF-derived porous Co₃O₄ nanosheets array assembled on SnO₂ nanofibers for humidity-resistant high efficiency acetone detection[J]. Chinese Chemical Letters, ;2026, 37(5): 110863. doi: 10.1016/j.cclet.2025.110863 shu

MOF-derived porous Co₃O₄ nanosheets array assembled on SnO₂ nanofibers for humidity-resistant high efficiency acetone detection

Jinwu Hu ^{a, 1} ,
Feng Wang ^{a, 1} ,
Jiejie Yu ^a ,
Zijun Hong ^a ,
Wenhui Zhang ^c ,
Hui-Jun Li ^a ,
Zhuangchai Lai ^d ,
Ding Wang ^{a, *,} ,
Yonghui Deng ^{b, *,} ,
Guisheng Li ^{a, *,}

a.
School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
b.
Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iCHEM, Fudan University, Shanghai 200433, China
c.
Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
d.
Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong 999077, China

wangding@usst.edu.cn

yhdeng@fudan.edu.cn

liguisheng@usst.edu.cn

Received Date: 30 November 2024
Revised Date: 3 January 2025
Accepted Date: 14 January 2025
Available Online: 15 January 2025

Figures(4)

Semiconducting metal oxide based gas sensors exhibit great promise for convenient detection of acetone, a biomarker gas in the exhaled breath of type-Ⅰ diabetes patients. However, the detection usually suffers the interference from exhaled moisture. To overcome this challenge, in this work, a novel hierarchical heterojunction structure consisting of SnO₂ nanofiber core and Co₃O₄ nanosheet shell (denoted as SnO₂@Co₃O₄ core-shell composite) was proposed for fabricating acetone sensor with excellent humidity resistance. Compared with SnO₂ nanofibers and Co₃O₄ nanosheets, the SnO₂@Co₃O₄ showed the highest sensing response, with a response value (R_g/R_a) of 11.27-50 ppm acetone at 110 ℃. In addition, the hierarchical SnO₂@Co₃O₄ core-shell structure shows fast response/recovery speed (19/43 s), lower detection limit (125 ppb), excellent selectivity and stability in a humidity environment (relative humidity 30%-90%) with a relative change of only 3%. The enhanced gas sensing performance toward acetone is attributed to the synergistic effect between the two components, the unique core-shell hierarchical structure and the rich oxygen vacancy density. Density functional theory calculations reveal that the SnO₂@Co₃O₄ has higher acetone adsorption energy than the two components. In addition, a novel SnO₂@Co₃O₄ gas sensing module and smart portable sensor device enable efficient real-time monitoring of acetone concentrations on a smartphone via Bluetooth communication.
- Hierarchical heterojunction,
- SnO₂ nanofiber,
- Co₃O₄ nanosheet,
- Acetone detection,
- Metal-organic framework
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MOF-derived porous Co₃O₄ nanosheets array assembled on SnO₂ nanofibers for humidity-resistant high efficiency acetone detection