Skin-mountable capacitive-type strain
sensors with great linearity
and low hysteresis provide inspiration for the interactions between
human and machine. For practicality, high sensing performance, large
stretchability, and self-healing are demanded but limited by stretchable
electrode and dielectric and interfacial compatibility. Here, we demonstrate
an extremely stretchable and self-healing conductor via both hard
and soft tactics that combine conductive nanowire assemblies with
double dynamic network based on π–π attractions
and Ag–S coordination bonds. The obtained conductor outperforms
the reported stretchable conductors by delivering an elongation of
3250%, resistance change of 223% at 2000% strain, high durability,
and multiresponsive self-healability. Especially, this conductor accommodates
large strain of 1500% at extremely knotted and twisted deformations.
By sandwiching hydrogel conductors with a newly developed dielectric,
ultrahigh stretchability and omni-healability are simultaneously achieved
for the first time for a capacitive strain sensor inspired by metal–thiolate
coordination chemistry, showing great potentials in wearable electronics
and soft robotics.