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Strain-Insensitive Outdoor Wearable Electronics by Thermally Robust Nanofibrous Radiative Cooler.

Yeongju Jung¹, Minwoo Kim¹, Seongmin Jeong¹

¹Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea.

|January 8, 2024

Summary

New wearable electronics offer stable outdoor performance. Integrating a robust nanofibrous cooler and strain-insensitive liquid metal conductors ensures reliable operation under sunlight and stretching.

Keywords:

all-aspect-stable consistent utilization liquid metal conductor polydimethylsiloxane nanofibers radiative cooling strain-insensitive

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Area of Science:

Materials Science and Engineering
Wearable Technology
Thermal Management

Background:

Outdoor wearable electronics face performance instability due to sunlight and movement.
Existing thermal management solutions use heat-vulnerable polymers and strain-susceptible conductors.
These limitations hinder the development of reliable wearable devices for outdoor use.

Purpose of the Study:

To develop mechanically, electrically, and thermally stable wearable electronics for outdoor applications.
To address the limitations of current materials in wearable electronic devices.
To enable consistent device performance under challenging environmental conditions.

Main Methods:

Integration of a polydimethylsiloxane (PDMS) nanofibrous cooler with high solar reflection and thermal emission.
Utilized laser-patterned liquid metal conductors for strain-insensitivity and negligible contact resistance.
Fabricated and tested wearable electronic devices incorporating these stable components.

Main Results:

Achieved thermally robust wearable electronics with excellent cooling performance.
Demonstrated strain-insensitive and electrically stable liquid metal conductors.
Developed wearable electronics that accurately detect physiological signals in harsh environments (sunlight, stretching up to 30%).

Conclusions:

The developed wearable electronics exhibit exceptional stability under mechanical stress and sunlight.
The combination of PDMS nanofibers and liquid metal conductors offers a promising solution for reliable outdoor wearable devices.
This work paves the way for everyday wearable electronics capable of consistent performance in demanding conditions.