4.7 Article

Excellent piezoresistivity of composites made from networked carbon nanotubes and polydimethylsiloxane: An intertube barrier driven strain sensing

期刊

出版社

VIETNAM NATL UNIV
DOI: 10.1016/j.jsamd.2021.07.001

关键词

Carbon nanotubes; Piezoresistivity; Poisson's ratio

资金

  1. Ministry of Science and Technology of Taiwan [MOST-109-2811-M-007-570]
  2. High Entropy Materials Center from The Featured Areas Research Center Program by the Ministry of Education (MOE) in Taiwan [108QR001J4]

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Composites made from multi-walled carbon nanotubes and polydimethylsiloxane exhibit excellent piezoresistivity at elastic limits, with high sensitivity and matched resistance changes during bending and twisting. Pulse-like resistance changes are attributed to the rapid increase in intertube spacing. The movement and segmentation of tube aggregates explain the tube mobility range and sensing mechanism.
Composites made from multi-walled carbon nanotubes and polydimethylsiloxane exhibit an excellent piezoresistivity at elastic limits where strain sensitivity reaches 0.93-0.96 and resistance changes due to stretching and compressing matches with loading histograms. Resistance change becomes pulse-like as the samples are bent and/or twisted, attributed to the rapid increase in intertube spacing. Straining induces movements and segmentations of tube aggregates with tube mobility ranging at 0.1-90 nm/s. Intertube barrier driven sensing mechanism is viscoelasticity related and is therefore interpreted on the basis of spring-dashpot models. (C) 2021 The Authors. Publishing services by Elsevier B.V. on behalf of Vietnam National University, Hanoi.

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