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 repeatabil-ity, a full concentration detection range (0-100％), low theoretical limit of detection (5.7 ppm), high sensi-tivity (0.2％/ppm), good linearity, excellent tempera-ture, 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.

Yuning Liang;Zixuan Wu;Yaoming Wei;Qiongling Ding;Meital Zilberman;Kai Tao;Xi Xie;Jin Wu

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;Department of Biomedical Engineering,Faculty of Engineering,Tel Aviv University,69978 Tel Aviv,Israel;Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace,Northwestern Polytechnical University,Xi'an 710072,People's Republic of China

纳微快报（英文）

[1]Yuning Liang;Zixuan Wu;Yaoming Wei;Qiongling Ding;Meital Zilberman;Kai Tao;Xi Xie;Jin Wu-.Self?Healing, Self?Adhesive and Stable Organohydrogel?Based Stretchable Oxygen Sensor with High Performance at Room Temperature)[J].纳微快报（英文）,2022(03):257-275

Organohydrogel,repeatabil,organohydrogel,organohydrogels

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