An Elastic and Damage-Tolerant Dry Epidermal Patch with Robust Skin Adhesion for Bioelectronic Interfacing

Area of Science:

• Materials Science
• Bioelectronics
• Wearable Technology

Background:

• Wearable on-skin patches are crucial for remote healthcare, clinical monitoring, and human-machine interfaces.
• Achieving high-fidelity signal acquisition alongside comfort and durability in epidermal electronics remains a significant challenge.

Purpose of the Study:

• To engineer a novel dry epidermal patch with enhanced mechanical properties and robust bioelectronic interfacing.
• To demonstrate the patch's capability for reliable physiological signal monitoring under diverse and challenging conditions.

Main Methods:

• Fabrication of a dry epidermal patch using a supramolecular polymer (SESA) with dynamic interactions and an in-situ transferred carbon nanotube network.
• Characterization of the patch's mechanical properties, including softness, elastic recovery, and damage resilience.
• Evaluation of the patch's performance in acquiring various physiological signals (ECG, EMG, pulse, kinematics) under dynamic and adverse conditions (stretching, underwater, sweat).

Main Results:

• The SESA-based patch exhibits tissue-like softness (Young's modulus ~0.1 MPa) and excellent elastic recovery (97% at 50% strain).
• The patch demonstrates intrinsic mechanical-electrical damage resilience (~90% restoration) and immunity to interference from motion, water, and sweat.
• Successful demonstration of versatile sensing applications, including ECG, EMG for gesture recognition, pulse monitoring, and knee kinematics.

Conclusions:

• The developed epidermal patch offers a promising solution for noninvasive, long-duration, and ambulant bioelectronic interfacing.
• Its unique material design provides superior comfort, durability, and anti-interference capabilities for advanced wearable healthcare and human-machine interaction.