期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 18, 页码 20965-20972出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c04013
关键词
underwater sensors; strain sensors; high linearity; double-network hydrogels; aqueous fabrication
资金
- Ministry of Science and ICT, Ministry of Education
- National Research Foundation of Korea through the Basic Science Research Program [2019R1I1A2A01040856]
- National Research Foundation of Korea through Engineering Research Center Program [2018R1A5A1025594]
- National Research Foundation of Korea [2019R1I1A2A01040856] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The development of stretchable strain sensors having high linearity and sensitivity, low hysteresis, and fast response to reliably monitor fast human motions is challenging. In this study, hydrogel-based strain sensors in the form of microfibers comprising tough double-network hydrogels or organogels and multi-walled carbon nanotubes (CNTs) are fabricated using aqueous microfluidic devices. Owing to the shear thinning effect on the microchannel, the CNTs can be aligned parallel to the flow direction, which increases the linearity of the sensor up to a strain of 400% and provides high durability over 50,000 strain cycles at 300% elongation. Owing to the negligible hysteresis, high resolution of 0.1%, and low response time of similar to 30 ms, the strain sensors enable the quantitative conversion of the measured resistance change to the extent of stimulus and the simple detection of the motion. The developed sensors can be stably used to detect human motions in real time in both air and water. Furthermore, the developed material system demonstrates the potential for use in the fabrication of pressure sensors.
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