The practical wearable electronics applications of stretchable conductive nanocomposites have been hindered by mechanical and electrical irreversibility. Here we report a resistive-type nanocomposite strain sensor, demonstrating excellent reversibility (30% strain, 3000 cycles). The sensor element consists of flower-shaped silver nanoparticles (AgNFs) embedded in a stretchable polyurethane (PU) matrix. The thin petals of AgNFs construct efficient percolation network with neighboring AgNFs. The nanocomposite sensor shows high sensitivity (gauge factor 32.08) and impressive mechanical and electrical reversibility. The recent progress in our lab will also be introduced. Reference: [1] Compos. Sci. and Tech., 221, 109305 (2022).
We present the electrical transport control of conductive nanocomposites by in-situ generated hierarchically structured silver nanosatellite (AgNS) particles [1, 2]. The AgNS particles are synthesized by the in-situ etching and reduction reaction of Ag flakes embedded in matrix polymer [1, 2]. The etching is controlled by THF peroxide, resulting in an interparticle distance of 4.37 nm. The strain-invariant resistance is obtained over 30 % strain if the barrier height is negligible by matching the work function of silver and electron affinity of polymer (electrode application) [1]. In contrast, transport is changed to quantum tunneling if the barrier height is gradually increased by employing different matrix polymers with smaller electron affinities. In such case, strain-sensitive resistance change is obtained for sensor application [1]. The recent progress in our laboratory will also be introduced. References [1] Science Advances, 8(32), eabn3365. [2] Nature Communications, 11, 2252.
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