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The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
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Ultrasensitive Biomimetic Skin with Multimodal and Photoelectric Dual-Signal Sensing.

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Researchers developed a stretchable optical/electrical (OE) biomimetic skin that sensitively detects pressure, strain, and temperature. This advanced OE skin enables intelligent human-machine interaction and wearable devices.

Keywords:
Michael addition reactionbiomimetic skincholesteric liquid crystalsdual-signal outpution-conductive hydrogelmultimodal sensing

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Area of Science:

  • Materials Science
  • Biomimetics
  • Sensors

Background:

  • Multimodal sensing with optical/electrical (OE) output signals is crucial for intelligent human-device interaction.
  • Existing technologies struggle to mimic biological skin's sensitivity and responsiveness.

Purpose of the Study:

  • To design a stretchable OE biomimetic skin (OE skin) capable of sensing complex stimuli.
  • To enable direct, intelligent interaction between users and devices.

Main Methods:

  • Fabrication of OE skin using polymer-stabilized cholesteric liquid crystal films, an ion-conductive hydrogel, and a polydimethylsiloxane membrane.
  • Characterization of the OE skin's optical and electrical sensing capabilities.

Main Results:

  • The OE skin demonstrated customizable structural color, thermochromism, and mechanochromism across the visible spectrum.
  • Achieved high linearity (>0.99) and fast response (93 ms) for optical sensing over a 119 °C range.
  • The hydrogel layer showed excellent pressure and stretch sensing (linearity 0.99998) and thermal sensitivity (0.86%/°C).

Conclusions:

  • The developed OE skin offers a novel design for multifunctional biomimetic surfaces.
  • This technology holds significant potential for intelligent wearable devices and advanced human-machine interfaces.