Journal
IEEE SENSORS LETTERS
Volume 1, Issue 3, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSENS.2017.2709943
Keywords
Mechanical sensors; strain sensor; highly stretchable; carbon nanotube (CNT)/polydimethylsiloxane (PDMS) composite; high-rate dynamic strain
Funding
- Sandia National Laboratories
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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In this letter, a new type of highly stretchable strain sensor was developed to measure large deformation of a specimen subjected to dynamic loading. The sensor was based on the piezoresistive response of carbon nanotube (CNT)/polydimethylsiloxane (PDMS) composite thin films. The piezoresistive response of CNT composite gives fast response in strain measurement, whereas the ultrasoft PDMS matrix provides high flexibility and ductility for large strain measurement. Experimental results showed that the CNT/PDMS sensor is capable of measuring large strains (up to 26%) with an excellent linearity and ultrafast response (less than 30 mu s). This stretchable strain sensor also exhibits much higher sensitivities, with a gauge factor of as high as 80, than the conventional foil strain gages. These strain sensing capabilities (large strain, ultafast response, high linearity, and high gauge factor) make the fabricated sensor suitable for high-rate dynamic loading test applications.
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