科研之友
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摘要
A highly stretchable silver nanowires/silver nanoparticles (AgNWs/AgNPs) conductor based on a polydopamine (PDA) modified three dimensional polyurethane (PU) sponge was fabricated. The PU sponge skeleton was first modified by PDA to improve adhesion to the conductive nanomaterials. The conductive micro-network was fabricated by dip-coating of the PDA modified PU sponge into the solution of AgNWs, and AgNPs were further sputtered onto its surface to improve conductivity, resulting in a conductive ternary network structure. The resistance of the PDA-PU-AgNW-Ag-PDMS stretchable conductor decreased obviously with bending or stretching cycles initially, and then remained stable even up to 1000 cycles. The composites exhibit high electrical conductivity (exceeding 27.78 S cm(-1)) and excellent electromechanical stability under high tensile strain (50%) owing to the combined effects from the ternary network. The significant electromechanical properties were also demonstrated by a simple stretchable circuit composed of a light-emitting diode (LED) and the stretchable conductor during bending, twisting or stretching.
