4.8 Article

Interfacial Capillary Spooling of Conductive Polyurethane-Silver Core-Sheath (PU@Ag) Microfibers for Highly Stretchable Interconnects

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 15, 期 18, 页码 22574-22579

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c03309

关键词

stretchable interconnects; core-sheath fibers; capillary force; droplet-fiber interface; in-drop spooling

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This article introduces a novel stretchable interconnect structure using nonvolatile droplet-conductive microfiber arrays. By employing the interfacial capillary spooling, the PU@Ag fibers can reversibly coil and uncoil under tensile force, while maintaining excellent conductivity.
Conductive fibers are core materials in textile electronics for the sustainable operation of devices under mechanical stimuli. Conventional polymer-metal core-sheath fibers were employed as stretchable electrical interconnects. However, their electrical conductivity is severely degraded by the rupture of metal sheaths at low strains. Because the core-sheath fibers are not intrinsically stretchable, designing a stretchable architecture of interconnects based on the fibers is essential. Herein, we introduce nonvolatile droplet-conductive microfiber arrays as stretchable interconnects by employing interfacial capillary spooling, motivated by the reversible spooling of capture threads in a spider web. Polyurethane (PU)-Ag core-sheath (PU@Ag) fibers were prepared by wet-spinning and thermal evaporation. When the fiber was placed on a silicone droplet, a capillary force was generated at their interface. The highly soft PU@ Ag fibers were fully spooled within the droplet and reversibly uncoiled when a tensile force was applied. Without mechanical failures of the Ag sheaths, an excellent conductivity of 3.9 x 104 S cm-1 was retained at a strain of 1200% for 1000 spooling-uncoiling cycles. A light-emitting diode connected to a multiarray of droplet-PU@Ag fibers exhibited stable operation during spooling- uncoiling cycles.

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