期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 321, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128507
关键词
Graphene hydrogel; Self-healing; Stretchable; Sensors; Wearable electronics
资金
- National Research Foundation of Korea from the Ministry of Science and ICT [2018H1D3A1A02074733, 2018R1D1A1B07050008]
- Ministry of Education, Republic of Korea
- Ajou University
- National Research Foundation of Korea [2018R1D1A1B07050008] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Graphene-based materials are of emerging interest; however, low stretchability limits their potential for wearable and sustainable electronics. Thus, this study presents the development of deformable and self-healing graphene hydrogels functionalized with polyurethane diol oligomer for wearable sensing applications. Controlling the loading of the oligomer, acting as a non-toxic plasticizer and providing abundant hydrogen bonds, is crucial to turn the functionalized hydrogels into a quasi-solid state with good stretchability and rapid healing ability (at room temperature). In sensing measurements, resistive-type sensors employing the functionalized hydrogels as the active channel show high responsiveness towards either small temperature changes (Delta T similar to 0.2 degrees C near 25 degrees C) or the existence of ammonia and nitrogen dioxide gases at very low concentrations (0.7-20 ppm and 0.8-3.5 ppm, respectively). Notably, the ammonia detectability of our material is excellent in a wide relative humidity range (0-65 %). Besides, the sensors can be elongated to 30 %, and the healing ability of the hydrogels can recover the sensing capability of damaged sensors (about 90 % in 30 s). Overall, the obtained results suggest that our functionalized graphene hydrogels are promising for developing wearable sensing applications like e-skin and e-nose.
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