Self-Powered Sweat-Responsive Structural Color Display

Taebin Kim, Tae Hyun Park, Jae Won Lee, Dongwook Lee, Seungsoo Mun, Gwangmook Kim, Yeonji Kim, Gwanho Kim, Jong Woong Park, Kyuho Lee, Seung Won Lee, Seungbae Jeon, Du Yeol Ryu, Wooyoung Shim, Jayoung Kim, Cheolmin Park

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Despite the remarkable progress in the development of sweat sensors, self-powered sweat-responsive sensing displays that detect sweat in electric signals with simultaneous and direct visualization of the sweat is rarely demonstrated. Here, a self-powered sweat-responsive structural color (SC) display enabled by ionomer-doped block copolymer (BCP) photonic crystals (PCs) is presented. The sweat-responsive BCP PC is developed by employing a cross-linking single-mobile ionomer (SMI) with mobile anions anchored to immobile polycations to a 1-D BCP PC. The hydrophobic SMI-doped BCP PC is mechanically robust as well as water and temperature-resistive, exhibiting ionomer concentration-dependent full visible SCs. Moreover, the mobile anions periodically confined in the SMI-doped BCP PC harvest triboelectric energy, giving rise to a high-power density of ≈0.774 Mw cm−2. Cation-sensitive SC variation is observed in the SMI-doped BCP PC, allowing the visualization of sweat containing various cations. A skin-patchable self-powered sweat-responsive display is demonstrated in which kirigami-patterned SMI-doped BCP PC incorporated in the display can withstand up to 50% strain during exercise. Sweat from the exercise is visualized via SC display and measured using both ionic resistance changes and triboelectric signals. In addition, the integration of sweat sensing membrane into SMI-doped BCP PC enables the quantification of sweat.

Original languageEnglish
Article number2314721
JournalAdvanced Functional Materials
Volume34
Issue number22
DOIs
Publication statusPublished - 2024 May 29

Bibliographical note

Publisher Copyright:
© 2024 Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Condensed Matter Physics
  • Electrochemistry

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