Volume 20, Issue 43 2403521
Research Article

Regulating Water Adsorption Sites of Keto-Enamine COF by Base Exfoliation and Deprotonation for Enhanced Humidity Response

Aohan Mei

Aohan Mei

State Key Laboratory of Silicate Materials for Architectures, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Hongbing Guo

Hongbing Guo

State Key Laboratory of Silicate Materials for Architectures, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Wenyuan Zhang

Wenyuan Zhang

State Key Laboratory of Silicate Materials for Architectures, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Yueli Liu

Corresponding Author

Yueli Liu

State Key Laboratory of Silicate Materials for Architectures, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070 P. R. China

Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya, 572024 P. R. China

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

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Wen Chen

Corresponding Author

Wen Chen

Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya, 572024 P. R. China

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070 P. R. China

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

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First published: 20 June 2024
Citations: 4

Abstract

Covalent organic framework (COF) has received much attention owing to its unique framework structure formed by diverse organic units. However, challenges, including low conductivity, structure instability, and limited control of adsorption and desorption processes, stimulate the modification of COF in electronic sensors. Herein, inspired by the alterable structure of COF in different solvents, a facile base exfoliation and deprotonation method is proposed to regulate the water adsorption sites and improve the intrinsic conductivity of TpPa-1 COF. TpPa-1 COF powders are exfoliated to nanosheets to increase water adsorption, while the deprotonation is utilized to adjust the affinity of water molecules on TpPa-1 COF framework, contributing to water accumulation in the 1D pores. The as-fabricated TpPa-1 COF sensor exhibits a decreased recovery time from 419 to 49 s, forming a linear relation between relative humidity (RH) value and humidity response. The excellent chemical stability of the covalent bond of TpPa-1 COF contributes to the excellent stable device performance in 30 days, promoting further integration and data analysis in respiration monitoring.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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