A Stretchable Electronic Tattoo for Self-Powered Human-Machine Interfaces and Therapeutic Applications

Area of Science:

• Materials Science
• Electrical Engineering
• Biomedical Engineering

Background:

• Flexible skin electronics are crucial for wearable human-machine interfaces.
• Challenges include maintaining biocompatibility and stable electrical performance under mechanical deformation.

Purpose of the Study:

• To develop novel flexible skin conductors with enhanced mechanical stability and conductivity.
• To create multifunctional on-skin applications for sensing, drug delivery, and human-machine interaction.

Main Methods:

• Fabrication of tattoo paper-based graphene-gold conductors with a dual conductive pathway.
• Integration of folding and kirigami structures to mitigate strain effects.
• Development of waterproof on-skin patches with integrated heaters and an on-skin dialing interface.

Main Results:

• Conductors exhibit negligible resistance changes across a broad strain range (0-130%).
• Achieved high initial conductivity of 1.5 × 10^3 S cm^-1.
• Demonstrated functional waterproof on-skin patches for body heating and drug delivery.
• Created a functional on-skin dialing interface powered by triboelectric nanogenerators.

Conclusions:

• Tattoo paper-based graphene-gold conductors offer a promising solution for robust and multifunctional flexible electronics.
• The developed kirigami and folding structures significantly improve strain tolerance.
• These advancements pave the way for next-generation wearable devices and human-machine interfaces.