Mei Aohan, Guo Hongbing, Zhang Wenyuan, Liu Yueli, Chen Wen
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.
Small. 2024 Oct;20(43):e2403521. doi: 10.1002/smll.202403521. Epub 2024 Jun 20.
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.
共价有机框架（COF）因其由多种有机单元形成的独特框架结构而备受关注。然而，包括低导电性、结构不稳定性以及对吸附和解吸过程控制有限等挑战，促使人们对用于电子传感器的COF进行改性。在此，受COF在不同溶剂中可变结构的启发，提出了一种简便的碱剥离和去质子化方法，以调节水吸附位点并提高TpPa - 1 COF的本征导电性。将TpPa - 1 COF粉末剥离成纳米片以增加水吸附，而去质子化则用于调节水分子对TpPa - 1 COF框架的亲和力，有助于一维孔中的水积累。所制备的TpPa - 1 COF传感器的恢复时间从419秒降至49秒，在相对湿度（RH）值和湿度响应之间形成线性关系。TpPa - 1 COF共价键优异的化学稳定性有助于器件在30天内具有出色的稳定性能，促进呼吸监测中的进一步集成和数据分析。
