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Various strategies to make the sensor stretchable placed according to their maximum elongations. Composites: CNT based [98] and silver nanostructures based [115]. 3-dimensional structures: helical [222], crack induced [223], and out of plane buckling [224]. Inplane structures: horseshoe [225], zig-zag [226], serpentine [227], and self-similar serpentine [94]. Stretchable materials: graphene [228], PDMS [229], EGaIn [230], and Ecoflex 00-30 [229].
