Self-Healing,Self-Adhesive and Stable Organohydrogel-Based Stretchable Oxygen Sensor with High Performance at Room Temperature  

作　　者：Yuning Liang Zixuan Wu Yaoming Wei Qiongling Ding Meital Zilberman Kai Tao Xi Xie Jin Wu 

机构地区：[1]State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology,School of Electronics and Information Technology,Sun Yat-Sen University,Guangzhou 510275,People’s Republic of China [2]Department of Biomedical Engineering,Faculty of Engineering,Tel Aviv University,69978 Tel Aviv,Israel [3]Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace,Northwestern Polytechnical University,Xi’an 710072,People’s Republic of China

出　　处：《Nano-Micro Letters》2022年第3期257-275,共19页纳微快报（英文版）

基　　金：support from the National Natural Science Foundation of China(61801525);the Guangdong Basic and Applied Basic Research Foundation(2020A1515010693);the Guangdong Natural Science Funds Grant(2018A030313400),the Science and Technology Program of Guangzhou(201904010456);the Fundamental Research Funds for the Central Universities,Sun Yat-sen University(2021qntd09).

摘　　要：With the advent of the 5G era and the rise of the Internet of Things,various sensors have received unprecedented attention,especially wearable and stretchable sensors in the healthcare field.Here,a stretchable,self-healable,self-adhesive,and room-temperature oxygen sensor with excellent repeatability,a full concentration detection range(0-100%),low theoretical limit of detection(5.7 ppm),high sensitivity(0.2%/ppm),good linearity,excellent temperature,and humidity tolerances is fabricated by using polyacrylamide-chitosan(PAM-CS)double network(DN)organohydrogel as a novel transducing material.The PAM-CS DN organohydrogel is transformed from the PAM-CS composite hydrogel using a facile soaking and solvent replacement strategy.Compared with the pristine hydrogel,the DN organohydrogel displays greatly enhanced mechanical strength,moisture retention,freezing resistance,and sensitivity to oxygen.Notably,applying the tensile strain improves both the sensitivity and response speed of the organohydrogel-based oxygen sensor.Furthermore,the response to the same concentration of oxygen before and after self-healing is basically the same.Importantly,we propose an electrochemical reaction mechanism to explain the positive current shift of the oxygen sensor and corroborate this sensing mechanism through rationally designed experiments.The organohydrogel oxygen sensor is used to monitor human respiration in real-time,verifying the feasibility of its practical application.This work provides ideas for fabricating more stretchable,self-healable,self-adhesive,and high-performance gas sensors using ion-conducting organohydrogels.

关 键 词：Stretchable oxygen sensors Organohydrogel SELF-HEALING SELF-ADHESIVE Electrochemical reaction 

分 类 号：TQ427.26[化学工程] TP212[自动化与计算机技术—检测技术与自动化装置]