Gradual electrical‐double‐layer modulation in ion‐polymer networks for flexible pressure sensors with wide dynamic range

Haechang Lee, Ramakant Sharma, Sehwan Park, Zhenan Bao, Hanul Moon*, Seunghyup Yoo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

To realize flexible pressure sensors with high sensitivity, surface-textured soft films have often been adopted and the contact area can vary significantly depending on the applied pressure. However, the contact area modulation realized in such a way is subject to a limited dynamic range, and its infinitesimal zero-pressure contact area raises concerns regarding durability. Herein, a flexible pressure sensor made of a texturing-free piezocapacitive layer based on ion-polymer networks is proposed. In this scheme, ion infiltration leads to electrical-double-layer modulation that gradually varies over a wide range of applied pressures. The proposed flexible pressure sensors with the optimal ion concentration are shown to exhibit both excellent mechanical durability and linear responses with high sensitivity over a wide pressure range up to 1 MPa. With the simple fabrication route, high performance, and reliability, the proposed approach may open up a new avenue for skin-like pressure sensors ideal for many emerging applications.
Original languageEnglish
Article number2302633
JournalAdvanced Functional Materials
VolumeEarly View
Early online date15 Oct 2023
DOIs
Publication statusE-pub ahead of print - 15 Oct 2023

Keywords

  • Electronic skin
  • Flexible pressure sensors
  • Texturing-free
  • Wearable electronics
  • Wide pressure range

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