Highly stretchable potentiometric ion sensor based on surface strain redistributed fiber for sweat monitoring

Shuqi Wang, Yuanyuan Bai, Xianqing Yang, Lin Liu, Lianhui Li, Qifeng Lu, Tie Li, Ting Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

Development of stretchable potentiometric ion sensors has the observable potential for wearable devices to continuously monitoring of electrolytes in body fluids. However, the mechanical mismatch between soft elastomeric substrate and ion-selective electrode components greatly hinders sensor's fabrication and its stretching stability for long-term use. Here, we propose a new strategy to construct a potentiometric ion sensor on a surface strain redistributed elastic fiber (SSRE-fiber) with both high stretchability and high sensing stability. The SSRE-fiber is designed with a unique unilateral bead structure, which significantly changes its surface strain distribution during deformation. Benefit from this platform, the active sensing materials with high Young's modulus fabricated on the unilateral bead region can keep unchanged during stretching (0–200%). Thus, the as-prepared potentiometric sensors (ion-selective electrode and polymer/inorganic salt membrane-coated reference electrode) can perform with stable functions ignoring the stretching of the fiber. This new SSRE-fiber platform paves a way for the design of highly stretchable and stable electrochemical sensor capable of integrating into textiles for wearable biochemical detection applications.

Original languageEnglish
Article number120869
JournalTalanta
Volume214
DOIs
Publication statusPublished - 1 Jul 2020
Externally publishedYes

Keywords

  • Fiber-shaped sensor
  • Ion-selective electrode
  • Reference electrode
  • Stretchable potentiometric ion sensor
  • Sweat detection

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