文献类型：期刊文献

英文题名：Humidity-compatible chemiresistive hydrogel sensor for real-time breath CO2 monitoring

作者：Wang, Tianyi;Wu, Longqi;Zhang, Chao;Zhang, Guozhu[1];Chen, Yang;Gao, Chengze;Wang, Zeyu;Wang, Yiming;Gao, Yang;Xuan, Fuzhen[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：524

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20254219348245);WOS:【SCI-EXPANDED(收录号:WOS:001604132800013)】；

基金：This work was supported by the Natural Science Foundation of Shanghai (Grant No. 23ZR1417000) and the National Natural Science Foundation of China, China (Grant Numbers: 52375148, 52321002, 52275146 and 12411530109) .

语种：英文

外文关键词：Hydrogels; Dimethylamino functional groups; Carbon dioxide sensors; Smart masks; Respiratory monitoring; Flexible electronics

摘要：Real-time monitoring of exhaled carbon dioxide (CO2) is essential for assessing metabolic status and tracking disease progression. However, the high moisture content of exhaled breath poses a significant challenge to the accuracy and stability of CO2 detection. Here, we present a flexible chemiresistive CO2 sensor based on a dimethylamine-functionalized hydrogel, in which water molecules critically facilitate the CO2-induced reversible protonation of tertiary amine groups, thereby modulating the hydrogel's ionic conductivity for real-time breath analysis. As a result, the hydrogel synthesized from N-[3-(dimethylamino) propyl] methacrylamide (DMAPMA) exhibits a high CO2 response of 37.3 % at 10,000 ppm and a low detection limit of 100 ppm. To further enhance mechanical durability under respiratory-induced stress, N,N-Dimethylacrylamide (DMAA) was incorporated into the hydrogel, increasing the tensile strain limit from 34.2 % to 51.0 % without compromising CO2 sensing performance. In addition, we demonstrate the integration of the hydrogel sensor into a wireless smart mask system, enabling multimodal monitoring of respiratory CO2 patterns, physical activity, and postprandial metabolic changes. This platform offers a scalable, low-power solution for wearable CO2 sensing in personalized health monitoring.