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(A) The changes in conductivity of the high stretchable conductor at different tensile strains; (B) the changes of durability in conductivity at various stretching cycles when the tensile strains are 0% and 70%, respectively; (C)/(D) digital images of the high stretchable conductor linked with a light-emitting diode at 0% (C) and 70% (D) tensile strains; (E)/(F) digital images of the copper film with rubber substrate at 0% (E) and 300% (F) tensile strains [9,37].
