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Phase-Transition-Driven Adaptive Reconfiguration of Wearable Devices for Conformal Biointerfaces.

Xiaoguang Hu1,2, Aoxi Yu1, Tao Jiang1

  • 1State Key Laboratory of Flexible Electronics & Institute of Advanced Materials, College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts & Telecommunications, Nanjing, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

Researchers developed a novel solid-liquid-solid phase transition strategy for flexible electronics. This method enables conformal integration with diverse biological surfaces, creating robust, stretchable, and removable wearable devices.

Keywords:
bioelectronic interfacesconformal integrationcurved surfacesflexible electronicsphase transition

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Wearable Technology

Background:

  • Flexible electronics integration with biological tissues is challenging due to non-planar and dynamic surfaces.
  • Conventional planar fabrication methods are incompatible with complex biological topographies.

Purpose of the Study:

  • To introduce a universal strategy for conformal integration of flexible electronics with unstandardized biological surfaces.
  • To enable the development of next-generation wearable devices with robust and adaptable interfaces.

Main Methods:

  • Utilized a solid-liquid-solid phase transition strategy with water-soluble polyvinyl alcohol (PVA) substrate.
  • PVA temporarily liquefies to conform to target topography upon wetting, then solidifies.
  • Developed shape-adaptable sensors and electrodes for biological surface monitoring.

Main Results:

  • Achieved robust, stretchable, and stress-free interfaces with interfacial toughness of ~29 J m⁻² and tensile strength of ~161 kPa.
  • Demonstrated reversible adhesion switching for on-demand, painless removal.
  • Successfully applied devices to silkworm bodies for motion tracking and plant leaves for electrophysiology.

Conclusions:

  • The solid-liquid-solid phase transition strategy provides a universal solution for conformal electronic integration.
  • This approach expands the utility of wearable electronics to previously inaccessible biological surfaces.
  • Enables advanced monitoring of dynamic biological systems through adaptable and removable devices.