A novel ionic-liquid strain sensor for large-strain applications

Yun Zhu, Chen Chao, Ching Hsing Cheng, Woon Fong Leung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)


A novel liquid strain sensor was developed by using "room-temperature ionic liquid" as the piezoresistive gauge material. Polydimethylsiloxane, with microchannels, was used to form gauge structures, and carbon fibers were used as electrodes. The strain performance was examined by electrochemical impedance spectroscopy at room temperature, and curve fitting was applied for explaining the strain response. The results show that a maximum true strain of up to 55% can be measured with good repeatability. A parabolic relationship between the real part of the impedance Zreand the true strain ε is observed, mainly due to the resistance change of the electrolyte. The demonstrated ionic-liquid-based strain sensor is of low cost, is environmentally friendly, and is promising for a wide variety of applications.
Original languageEnglish
Pages (from-to)337-339
Number of pages3
JournalIEEE Electron Device Letters
Issue number4
Publication statusPublished - 12 Feb 2009


  • Electrochemical impedance spectroscopy (EIS)
  • Liquid strain sensor
  • Room-temperature ionic liquid (IL)
  • True strain

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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