Magnetically induced micropillar arrays for an ultrasensitive flexible sensor with a wireless recharging system

Libo Gao*, Ying Han, James Utama Surjadi, Ke Cao, Wenzhao Zhou, Hongcheng Xu, Xinkang Hu, Mingzhi Wang, Kangqi Fan, Yuejiao Wang, Weidong Wang*, Horacio D. Espinosa*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Significant efforts have been devoted to enhancing the sensitivity and working range of flexible pressure sensors to improve the precise measurement of subtle variations in pressure over a wide detection spectrum. However, achieving sensitivities exceeding 1000 kPa−1 while maintaining a pressure working range over 100 kPa is still challenging because of the limited intrinsic properties of soft matrix materials. Here, we report a magnetic field-induced porous elastomer with micropillar arrays (MPAs) as sensing materials and a well-patterned nickel fabric as an electrode. The developed sensor exhibits an ultrahigh sensitivity of 10,268 kPa−1 (0.6–170 kPa) with a minimum detection pressure of 0.25 Pa and a fast response time of 3 ms because of the unique structure of the MPAs and the textured morphology of the electrode. The porous elastomer provides an extended working range of up to 500 kPa with long-time durability. The sophisticated sensor system coupled with an integrated wireless recharging system comprising a flexible supercapacitor and inductive coils for transmission achieves excellent performance. Thus, a diverse range of practical applications requiring a low-to-high pressure range sensing can be developed. Our strategy, which combines a microstructured high-performance sensor device with a wireless recharging system, provides a basis for creating next-generation flexible electronics. [Figure not available: see fulltext.]

Original languageEnglish (US)
Pages (from-to)1977-1988
Number of pages12
JournalScience China Materials
Volume64
Issue number8
DOIs
StatePublished - Aug 2021

Keywords

  • flexible electronics
  • high sensitivity
  • pressure sensor
  • supercapacitor
  • wireless recharging

ASJC Scopus subject areas

  • General Materials Science

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