Scientists from Chalmers University of Technology in Sweden have found a way to turn textiles into energy sources. They created a unique silk thread coated with a conductive plastic material that can use body heat to generate electricity. This flexible, lightweight, and non-toxic material is ideal for wearable technology.

The silk thread is coated with a conducting polymer—a type of plastic with a special chemical structure that allows it to conduct electricity. “The polymers we use are flexible, lightweight, and easy to apply in both liquid and solid forms. They are also non-toxic,” said Mariavittoria Craighero, the lead author and doctoral student at the university.

Remarkably, the thread retained its electrical properties for over a year and could withstand multiple washes without losing conductivity. “After seven washes, the thread maintained two-thirds of its conductivity. This is a very positive outcome, though improvements are needed for commercial use,” said Craighero.

Currently, producing this thermoelectric fabric is labor-intensive, as the material and sewing require manual work. Sewing one fabric piece can take up to four days. However, researchers are optimistic about the thread’s potential and believe automation could make large-scale production possible.

“We have demonstrated that it’s feasible to create conductive organic materials that meet the functional needs of these textiles,” said Christian Müller, the lead researcher at Chalmers University, in a press release.