Achieving Super Sensitivity in Capacitive Strain Sensing by Electrode Fragmentation

Hussein Nesser, Gilles Lubineau*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Accurate wireless strain monitoring is critical for many engineering applications. Capacitive strain sensors are well suited for remote sensing but currently have a limited sensitivity. This study presents a new approach for improving the sensitivity of electrical capacitance change-based strain sensors. Our technology is based on a dielectric elastomer layer laminated between two fragmented electrodes (i.e., carbon nanotube papers) that, by design, experiences a significant change in resistance (from ω to Mω) when stretched and makes the sensor behave as a transmission line, a well-known structure in telecommunication engineering. The strain-dependent voltage attenuation over the structure length results in a large variation of the effective capacitance (gauge factor exceeding 37 at 3% strain).

Original languageEnglish (US)
Pages (from-to)36062-36070
Number of pages9
JournalACS Applied Materials and Interfaces
Volume13
Issue number30
DOIs
StatePublished - Aug 4 2021

Keywords

  • capacitive behavior
  • dielectric materials
  • fragmented electrodes
  • strain sensor
  • transmission line model
  • wireless detection

ASJC Scopus subject areas

  • General Materials Science

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