Bimodal Thermoelectric/AIE E-Skin Decouples Contact-Area Ambiguity for Concurrent Pain Perception and Injury Mapping

Area of Science:

• Materials Science
• Robotics
• Biomedical Engineering

Background:

• Thermoceptive electronic skins (e-skins) suffer from signal ambiguity due to the contact-area effect in thermoelectric devices.
• This ambiguity limits reliable thermal hazard assessment, as localized and widespread temperature stimuli produce indistinguishable signals.

Purpose of the Study:

• To develop a dual-modality e-skin that integrates thermoelectric and photoluminescent layers to decouple temperature from contact area.
• To achieve reliable thermal sensing, real-time injury visualization, and nociceptive-like feedback.

Main Methods:

• Fabrication of a bilayer e-skin combining a single-walled carbon nanotube-based thermoelectric layer and an aggregation-induced emission (AIE) luminogen-based photoluminescent layer.
• Utilizing the thermoelectric layer for voltage-encoded nociceptive signals and the AIE layer for contact-area-independent optical thermal mapping via photoluminescence quenching.
• Validation using a biomimetic robotic reflex system.

Main Results:

• The e-skin demonstrated accurate temperature recognition with >97% accuracy.
• Real-time injury visualization and reliable nociceptive-like sensing were achieved.
• The dual-modality approach successfully decoupled temperature information from the contact-area effect.

Conclusions:

• The developed e-skin offers a robust solution for intelligent safety protection in dynamic thermal environments.
• This technology enhances human-machine interaction by providing intuitive thermal feedback.
• The integration of thermoelectric and AIE photoluminescence presents a significant advancement in e-skin technology.