A battery-free smart mask for long-term exhaled breath biochemical sensing - Heng, Wenzheng; Putz, Christoph; Tang, Wenying; Min, Jihong; Lehner, Lukas E; Demchyshyn, Stepan; Kim, Gwangmook; Wang, Canran; Hailegnaw, Bekele; Rippatha, Elias; others (Nature Sensors, 2026)