期刊
SMALL
卷 14, 期 14, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201704232
关键词
high sensitivity; high stretchability; microstructured conductive composites; multiaxial strain sensing; stretchable strain sensors
类别
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning
- Basic Science Research Program [2015R1A2A2A01004038]
- National Research Foundation of Korea [21A20130012631] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
High sensitivity and high stretchability are two conflicting characteristics that are difficult to achieve simultaneously in elastic strain sensors. A highly sensitive and stretchable strain sensor comprising a microstructured metal nanowire (mNW)/elastomer composite film is presented. The surface structure is easily prepared by combining an mNW coating and soft-lithographic replication processes in a simple and reproducible manner. The densely packed microprism-array architecture of the composite film leads to a large morphological change in the mNW percolation network by efficiently concentrating the strain in the valley regions upon stretching. Meanwhile, the percolation network comprising mNWs with a high aspect ratio is stable enough to prevent electrical failure, even under high strains. This enables the sensor to simultaneously satisfy high sensitivity (gauge factor approximate to 81 at > 130% strain) and high stretchability (150%) while ensuring long-term reliability (10 000 cycles at 150% strain). The sensor can also detect strain induced by bending and pressure, thus demonstrating its potential as a versatile sensing tool. The sensor is successfully utilized to monitor a wide range of human motions in real time. Furthermore, the unique sensing mechanism is easily extended to detect more complex multiaxial strains by optimizing the surface morphology of the device.
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