Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 46, Pages 52070-52081Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c17669
Keywords
organohydrogel; stretchable gas sensor; ammonia sensing; NO2 sensing; self-healing; first-principles study
Funding
- National Natural Science Foundation of China [61801525]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010693]
- Guangdong Natural Science Funds Grant [2018A030313400]
- Science and Technology Program of Guangzhou [201904010456]
- Fundamental Research Funds for the Central Universities, Sun Yat-sen University [19lgpy84]
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Conductive hydrogels have emerged as promising candidate materials for fabricating wearable electronics because of their fascinating stimuli-responsive and mechanical properties. However, the inherent instability of hydrogels seriously limits their application scope. Herein, the stable, ultrastretchable (upon to 1330% strain), self-healing, and transparent organohydrogel was exploited as a novel gas-responsive material to fabricate NH3 and NO2 gas sensors for the first time with extraordinary performance. A facile solvent substitution method was employed to convert the unstable hydrogel into the organohydrogel with a remarkable moisture retention (avoid drying within a year), frost resistance (freezing point below -130 degrees C), and unimpaired mechanical and gas sensing properties. First-principles simulations were performed to uncover the mechanisms of antidrying and antifreezing effects of organohydrogels and the interactions between NH3/NO2 and organohydrogels, revealing the vital role of hydrogen bonds in enhancing the stability and the adsorption of NH3/NO2 on the organohydrogel. The organohydrogel gas sensor displayed high sensitivity, ultralow theoretical limit of detection (91.6 and 3.5 ppb for NH3 and NO2, respectively), reversibility, and fast recovery at room temperature. It exhibited the capabilities to work at a highly deformed state with nondegraded sensing performance and restore all the electrical, mechanical, and sensing properties after mechanical damage. The gas sensing mechanism was understood by considering the gas adsorption on functional groups, dissolution in the solvent, and the hindering effect on the transport of ions.
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