Totally shape-conformable electrode/hydrogel composite for on-skin electrophysiological measurements

Kuniaki Nagamine, Shun Chihara, Hiroyuki Kai, Hirokazu Kaji, Matsuhiko Nishizawa

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

An Au film electrode supported by a conductive elastic film was tightly bonded on a stretchable double-network hydrogel sheet by means of the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) grown from the electrode surface into the hydrogel. This electrode/hydrogel composite showed stable resistance of 35 ± 5 Ω sq−1 even during successive 20% stretching because of the pre-formed, designed cracks in the Au film. The large interfacial electric double layer capacitance (9.5 ± 0.3 mF cm−2) of the PEDOT adhesive layer at the interface of the layered composite was found to stabilize the electrode potential against external noises, and decrease the electric impedance at the frequency of 5–500 Hz, which is the typical range of electromyographic signals. The electrical robustness and shape-conformability of the composite electrode were demonstrated by monitoring electromyographic signals of the joint of a human forefinger. In addition, it was also demonstrated that an ionic liquid-containing gel (ionogel) serves as a substrate of the composite for longer-term monitoring over 3 days on air-exposed human skin.

Original languageEnglish
Pages (from-to)49-53
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume237
DOIs
Publication statusPublished - 2016 Dec 1

Keywords

  • Conducting polymer
  • Electrode/hydrogel hybrid
  • Electrophysiological measurements
  • Shape-conformable device

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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