Pressure-sensitive strain sensor based on a single percolated Ag nanowire layer embedded in colorless polyimide

Chan Jae Lee, Sungwoo Jun, Byeong Kwon Ju, Jong Woong Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This paper presents the fabrication of an elastomer-free, transparent, pressure-sensitive strain sensor consisting of a specially designed silver nanowire (AgNW) pattern and colorless polyimide (cPI). A percolated AgNW network was patterned with a simple tandem compound circuit, which was then embedded in the surface of the cPI via inverted layer processing. The resulting film-type sensor was highly transparent (~93.5% transmittance at 550 nm) and mechanically stable (capable of resisting 10000 cycles of bending to a 500 µm radius of curvature). We demonstrated that a thin, transparent, and mechanically stable electrode can be produced using a combination of AgNWs and cPI, and used to produce a system sensitive to pressure-induced bending. The capacitance of the AgNW tandem compound electrode pattern grew via fringing, which increased with the pressure-induced bending applied to the surface of the sensor. The sensitivity was four times higher than that of an elastomeric pressure sensor made with the same design. Finally, we demonstrated a skin-like pressure sensor attached to the inside wrist of a human arm.

Original languageEnglish
Pages (from-to)8-12
Number of pages5
JournalPhysica B: Condensed Matter
Volume514
DOIs
Publication statusPublished - 2017 Jun 1

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Keywords

  • Composite
  • Flexible electrode
  • Pressure sensor
  • Silver nanowire
  • Strain sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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