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Highly Oxidation-Resistant and Self-Healable MXene-Based Hydrogels for Wearable Strain Sensor |
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| Authors: | Ari Chae G. Murali Seul-Yi Lee Jeonghwan Gwak Seon Joon Kim Yong Jin Jeong Hansol Kang Seongmin Park Albert S. Lee Dong-Yeun Koh Insik In Soo-Jin Park |
| Affiliation: | 1. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141 Republic of Korea Convergence Research Center for Solutions to Electromagnetic Interference in Future-mobility, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792 Republic of Korea;2. Department of IT-Energy Convergence (BK21 Four), Korea National University of Transportation, Chungju, 27469 Republic of Korea Department of Polymer Science and Engineering, Chemical Industry Institute, Korea National University of Transportation, Chungju, 27469 Republic of Korea;3. Department of Chemistry, Inha University, Incheon, 22212 Republic of Korea;4. Department of IT-Energy Convergence (BK21 Four), Korea National University of Transportation, Chungju, 27469 Republic of Korea Department of Software, Department of Biomedical Engineering,and Department of AI Robotics Engineering, Korea National University of Transportation, Chungju, 27469 Republic of Korea;5. Convergence Research Center for Solutions to Electromagnetic Interference in Future-mobility, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792 Republic of Korea Materials Architecture Research Center, Korea Institute of Science and Technology, Seoul, 02792 Republic of Korea;6. Department of IT-Energy Convergence (BK21 Four), Korea National University of Transportation, Chungju, 27469 Republic of Korea Department of Materials Science and Engineering, Korea National University of Transportation, Chungju, 27469 Republic of Korea;7. Convergence Research Center for Solutions to Electromagnetic Interference in Future-mobility, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792 Republic of Korea;8. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141 Republic of Korea;9. Department of IT-Energy Convergence (BK21 Four), Korea National University of Transportation, Chungju, 27469 Republic of Korea |
| Abstract: | Very recently, MXene-based wearable hydrogels have emerged as promising candidates for epidermal sensors due to their tissue-like softness and unique electrical and mechanical properties. However, it remains a challenge to achieve MXene-based hydrogels with reliable sensing performance and prolonged service life, because MXene inevitably oxidizes in water-containing system of the hydrogels. Herein, catechol-functionalized poly(vinyl alcohol) (PVA-CA)-based hydrogels is proposed to inhibit the oxidation of MXene, leading to rapid self-healing and superior strain sensing behaviors. Sufficient interaction of hydrophobic catechol groups with the MXene surface reduces the oxidation-accessible sites in the MXene for reaction with water and eventually suppresses the oxidation of MXene in the hydrogel. Furthermore, the PVA-CA-MXene hydrogel is demonstrated for use as a strain sensor for real-time motion monitoring, such as detecting subtle human motions and handwriting. The signals of PVA-CA-MXene hydrogel sensor can be accurately classified using deep learning models. |
| Keywords: | deep learning hydrogels MXenes oxidation poly(vinyl alcohol) sensors |