Fig. 5.

a Illustration of strain sensor made with graphite coated silk fiber, and b the mechanism diagram of the sensor [109]. Copyright © 2016 American Chemical Society. c A sandwich-structure strain sensor with Ag nanowire and PDMS, and d corresponding strain-sensing mechanism of the sensor [166]. Copyright © 2014 American Chemical Society. e Fabrication illustration of the Ag nanowire/PDMS stretchable conductors, f the surface buckling of the conductor after stretching and releasing cycles, g the diagrams of the conductor in initial state and 50% strain respectively, h fabrication of a capacitance strain sensors with Ag nanowire/PDMS and corresponding sensing mechanism [169]. Copyright © 2012 Wiley–VCH. i Illustration of a single-fiber strain sensor by multicore-shell printing process, and j corresponding circuit of the capacitance sensor [78]. Copyright © 2015 Wiley-VCH