Fig. 4: LB-LMPs-based multi-layered stretchable circuit.
From: Self-packaged stretchable printed circuits with ligand-bound liquid metal particles in elastomer
a Schematic illustration and resistance of the selectively electrically connected LB-LMPs-based conductor with silver flakes. b SEM image of selective electrical connections after printing silver flake composites (3 biological replicates). c Optical images and schematic illustration of the LED array under strain. d Schematic illustration of the S-PCB with conductive traces, VIAs, and electronic components using LB-LMPs for PPG and temperature sensing. e Optical image of the PPG sensor attached to human skin. f The normalized reading of the PPG sensor on the wrist. g Measured skin temperature change on the wrist. h Optical image of a stand-alone 4-layer integrated S-PCB (top) and the S-PCB under 215% strain (bottom).
