Wrinkled, cracked and bridged carbon networks for highly sensitive and stretchable strain sensors

Dan Liu, Heng Zhang, Haomin Chen, Jeng Hun Lee, Fengmei Guo, Xi Shen, Qingbin Zheng, Jang Kyo Kim

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

With rapid advance of wearable electronics technologies, flexible strain sensors having both high sensitivity and high stretchability are highly desired. In this work, inspired by lotus roots whose fibers remain joined even after fracture, highly sensitive and stretchable strain sensors are designed using single-walled carbon nanotube (SWNT)/graphene oxide (GO) hybrid thin films with unique wrinkled, cracked and bridged morphologies. The distinctive wrinkled and cracked structure is created by tuning the pre-stretching releasing of the hybrid film on a silicone rubber substrate. Under tension, the myriad SWNTs bridged the wrinkled film by sliding within the hybrid film giving rise to high stretchability, while the nano/microscale cracks provide the strain sensor with a high sensitivity through tunneling. Thanks to the synergy arising from the wrinkles, cracks and bundles bridged the cracks, the hybrid sensor exhibits a wide sensing range of 100 %, an ultrahigh gauge factor of 2000 with excellent stability for over 1000 cycles. These exceptional properties enable the sensor to monitor full range human motions from tiny eye blinks to large joint movements. A wearable gaming controller is prototyped using the developed sensor to demonstrate voice-empowered maneuver of car racing games.

Original languageEnglish
Article number107221
JournalComposites Part A: Applied Science and Manufacturing
Volume163
DOIs
Publication statusPublished - Dec 2022

Keywords

  • Carbon network
  • Crack
  • Highly stretchable and sensitive
  • Strain sensor
  • Wrinkle

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

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