Volume 21, Issue 12 2407436
Research Article

Linkage Engineering of Semiconductive Covalent-Organic Frameworks toward Room-Temperature Ppb-Level Selective Ammonia Sensing

Zhuang Yan

Zhuang Yan

CAS Key Laboratory for Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

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Munan Fang

Munan Fang

CAS Key Laboratory for Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

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Longfei Wang

Longfei Wang

CAS Key Laboratory for Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

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Huiwen Gao

Huiwen Gao

CAS Key Laboratory for Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

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Yue Ying

Yue Ying

CAS Key Laboratory for Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

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Jinlei Yang

Jinlei Yang

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

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Jiahua Wang

Jiahua Wang

CAS Key Laboratory for Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190 P. R. China

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Yaling Liu

Corresponding Author

Yaling Liu

CAS Key Laboratory for Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

E-mail: [email protected]; [email protected]

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Zhiyong Tang

Corresponding Author

Zhiyong Tang

CAS Key Laboratory for Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

E-mail: [email protected]; [email protected]

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First published: 16 February 2025
Citations: 1

Abstract

Rational design of molecular architectures is crucial for developing advanced materials such as covalent-organic frameworks (COFs) with excellent sensing performance. In this work, two isostructural COFs (β-keto-AnCOF and imine-AnCOF) with the same conjugated linkers but distinct linkages are constructed. Although both COFs have porous structure and semiconductor behavior conferred by the identical conjugated backbones, β-keto-AnCOF with ─C═O side groups exhibits superior room-temperature ammonia (NH3) sensing performance than imine-AnCOF and even the state-of-the-art dynamic and commercial NH3 sensors, i.e., high sensitivity up to 18.94% ppm−1, ultralow experimental detection limit of 1 ppb, outstanding selectivity, and remarkable response stability and reproducibility after 180 days. In situ spectroscopy and theoretical calculation reveal that the additional charge transfer between NH3 and ─C═O sites in β-keto-AnCOF effectively increases the distance between Fermi level and the valence band, enabling highly-sensitive NH3 detection at ppb levels. This work provides novel molecular architectures for next-generation high-performance sensors.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supporting information of this article.

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