Korean Scientists Create Self-Powered Fibers With Spray Paint

Imagine clothes that charge your phone or sensors that never need batteries, made with technology as simple as spray painting a wall.

A research team from South Korea's Korea Research Institute of Chemical Technology and Korea University of Technology and Education just cracked a major manufacturing puzzle. They developed fibers that generate electricity from movement using nothing more complicated than a spray coating process.

Traditional methods for making these power-generating fibers required expensive high-voltage equipment and multiple manufacturing steps. The new approach blends two common polymers and sprays them through an ordinary nozzle, where the materials naturally organize themselves into the perfect structure as they dry.

The magic happens when the spray passes through the nozzle. The force stretches the polymer molecules and locks them in place as the solvent evaporates. Meanwhile, the two polymers separate on their own, with one forming a protective outer layer and the other creating an energy-generating core inside.

The resulting material taps into triboelectricity, the same force that creates static when you rub a balloon on your hair. When pressed and released, the fibers produce 290 volts of electricity, enough to power small sensors and devices.

The team proved the concept works in real life by building a self-powered keypad for a smart door lock. Each of the 12 keys generated its own electrical signal when pressed, recognizing the correct password and unlocking the door without any batteries or external power.

The fibers stayed strong through 30,000 presses, showing they can handle everyday wear and tear. Tests measured a maximum power density of 1.23 watts per square meter, solid performance for wearable electronics.

The Ripple Effect

This simple manufacturing process could transform how we make smart clothing and wearable devices. Complex high-voltage equipment has kept these technologies expensive and difficult to produce at scale. Now companies could manufacture self-powered sensors using spray coating systems already common in factories.

The breakthrough opens doors for medical monitors that never need charging, sports gear that tracks performance without batteries, and building materials that harvest energy from footsteps. Because the process works without specialized equipment, even small manufacturers could create custom sensors for specific applications.

Dr. Eun-Ho Sohn, Dr. Ju Hyeon Kim, and Professor Jin Woo Bae published their findings in Advanced Composites and Hybrid Materials in October 2026. Their work removes a major barrier between laboratory innovations and products people can actually buy and use.

The future of wearable technology just got simpler, cheaper, and more accessible to everyone.