August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

【242】Color-Changing Coatings to Detect Critical-Temperature Conditions in High-Performance Fiber Applications

Sep 2, 2021, 2:45 PM
Room C

Room C

Talk Surfaces, Interfaces and Thin Films Surfaces, Interfaces and Thin Films


Dirk Hegemann (Empa)


High performance synthetic fibers are increasingly applied in fields where they might be exposed to elevated temperatures. Above a critical temperature, Tc, however, they lose their mechanical properties resulting in unexpected failure under load. To enable a passive sensor monitoring the temperature history, we introduce a method to functionalize polymer fibers with ultrathin thermochromic optical coatings by Magnetron sputtering based on chalcogenide phase change materials. The optical contrast for the amorphous-to-crystalline transition of GeSbTe (GST) upon heating to Tc was enhanced by reflectors. We found, that the color change can be adjusted by the Ge content to the demanded temperature range matching Tc of industrially important polymer fibers.

Primary authors

Dirk Hegemann (Empa) Dr Henning Galinski (ETHZ D-MATL) Martin Amberg (Empa) Prof. Ralph Spolenak (ETHZ D-MATL)

Presentation materials

There are no materials yet.