Study of Intermolecular Reconfiguration of Flexible COF‐5 Film and Its Ultra‐high Chemiresistive Humidity Sensitivity

Recently, abundant active materials are developed to achieve the wearable detection of human body humidity. However, the limited response signal and sensitivity restrict further application due to their moderate affinity to water. Herein, we propose a flexible COF‐5 film synthesized by a brief vapor...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2023-05, Vol.62 (19), p.e202301440-n/a
Main Authors: Mei, Aohan, Chen, Wen, Yang, Zifan, Zhou, Min, Jin, Wei, Yang, Shuang, Chen, Keqiang, Liu, Yueli
Format: Article
Language:English
Subjects:
Covalent Organic Framework
Deformation
Flexible Devices
Human body
Humidity Sensing
Hygrometers
Intermediates
Reconfiguration
Relative humidity
Respiration Monitoring
Room temperature
Sensitivity
Water Adsorption
Water chemistry
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Summary:Recently, abundant active materials are developed to achieve the wearable detection of human body humidity. However, the limited response signal and sensitivity restrict further application due to their moderate affinity to water. Herein, we propose a flexible COF‐5 film synthesized by a brief vapor‐assisted method at room temperature. Intermediates are calculated by DFT simulation to investigate the interaction between COF‐5 and water. The adsorption and desorption of water molecule result in a reversible deformation of COF layers while creating new conductive path by π–π stacking. The as‐prepared COF‐5 films are applied to the flexible humidity sensors, exhibiting a resistance change in 4 orders of magnitude with remarkable linear relation between log function of resistance and relative humidity (RH) in 11 %–98 % RH range. Applications including respiratory monitoring and non‐contact switch are tested, providing a promising prospect for the detection of human body humidity. A flexible COF‐5 film is synthesized on PI substrate by a vapor‐assisted conversion method and used to fabricate a humidity sensor. The sensor shows resistance response to 11 %–98 % RH over 4 orders of magnitude and maintains a linear relation even when bent at 180°. Simulations are applied to reveal the intermolecular reconfiguration mechanism in humidity sensing. The superior sensitivity makes COF‐5 films a potential candidate for human respiration monitoring.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202301440