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Ultra-stretchable and skin-mountable strain sensors using carbon nanotubes–Ecoflex nanocomposites

mortezaamjadi's picture

Super-stretchable, skin-mountable, and ultra-soft strain sensors are presented by using carbon nanotube percolation networksilicone rubber nanocomposite thin films. The applicability of the
strain sensors as epidermal electronic systems, in which mechanical compliance like human skin and high stretchability (e > 100%) are required, has been explored. The sensitivity of the strain
sensors can be tuned by the number density of the carbon nanotube percolation network. The strain sensors show excellent hysteresis performance at different strain levels and rates with high
linearity and small drift. We found that the carbon nanotubesilicone rubber based strain sensors possess super-stretchability and high reliability for strains as large as 500%. The nanocomposite
thin films exhibit high robustness and excellent resistancestrain dependency for over 1380% mechanical strain. Finally, we performed skin motion detection by mounting the strain sensors
on different parts of the body. The maximum induced strain by the bending of the finger, wrist, and elbow was measured to be 42%, 45% and 63%, respectively.

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