Fig. 4

Electrical performance of the fabricated bubble conductor under tensile strain. a ΔR/R ₀ values measured for bare conductor and bubble conductor under tensile strains of up to 80 %, b digital cross-sectional images of bubble conductors deformed at different strains (scale bar: 500 μm), c schematic illustration of effect of air bubbles on the morphologies of the conductive networks in the polymer matrix upon stretching, and d ΔR/R ₀ of bubble conductor under repetitive strain loading (80 %) and unloading (0 %)