Journal
NANOTECHNOLOGY
Volume 31, Issue 33, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab8edd
Keywords
multi-walled carbon nanotube; film sensor; vibration sensing; human motion monitoring
Funding
- National Natural Science Foundation of China [11972005]
- NSF for Distinguished Young Scholars of Fujian Province [2017J07004]
- Ministry of Science and Technology of Taiwan
- MOST [108-2221-E-155-042-MY2, 104-2221-E155-057-MY3]
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Flexible sensors at small scales have potential applications in many fields. Until now, the research on high-performance vibration sensors based on soft materials with high sensitivity and precision, fast response and high stability are still in its infancy. In this work, a flexible, wearable and high precision film sensor based on multi-walled carbon nanotube (MWCNT) was prepared via a vacuum filtration process and then encapsulated within polydimethylsiloxane (PDMS). The sensor exhibits an ultrahigh sensitivity with gauge factor of 214.3 at flexural strain of 0.4%. When used to monitor the vibration responses of a carbon-fiber beam induced by the base excitation and impact hammer, the time and frequency responses were comparable with the results obtained by the accelerometer, with difference less than 1\!%. In addition, when the MWCNT/PDMS thin film was employed as an electronic skin sensor attached on the human body to detect human activities, the high sensitivity and repeatability demonstrate a great potential application in monitoring human motion.
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