研究目的
To develop a simple, scalable, and low-cost capillary-driven self-assembly method for fabricating flexible and stretchable conductive fibers using silver nanowires for applications in smart textiles and wearable devices.
研究成果
The capillarity-driven self-assembly method successfully fabricates flexible and stretchable conductive fibers with high conductivity and mechanical stability. Ag NWs-coated nylon achieves a low linear resistance of 1.4 Ω/cm with minimal increase after bending, and PDMS fibers maintain conductivity up to 20% strain. This approach is scalable and low-cost, offering potential for wearable electronics and smart textiles.
研究不足
The method may have limitations in achieving very high conductivity for all fiber types, as nylon showed better results than cotton or polyester. Stretchability is limited to 20% strain for PDMS fibers without significant resistance change, and higher strains cause damage. Scalability, while improved, might still face challenges in industrial applications.
1：Experimental Design and Method Selection:
The study employs a capillarity-driven self-assembly method, utilizing evaporation-induced flow and capillary action to coat silver nanowires (Ag NWs) on yarn and PDMS fibers. A homemade waterwheel-like assembly instrument is designed for large-scale preparation.
2：Sample Selection and Data Sources:
Yarns (cotton, polyester, nylon) and PDMS fibers are used as substrates. Ag NWs are synthesized via polyol reduction method, and graphene oxide (GO) is prepared from natural graphite.
3：List of Experimental Equipment and Materials:
Equipment includes a scanning electron microscope (SEM, Hitachi S-4800), semiconductor characterization system (Keithley 2400), optical microscope (Nikon Eclipse E400), and a homemade waterwheel-like assembly instrument. Materials include Ag NWs, PDMS, dopamine, glycerol, polyvinyl pyrrolidone, AgNO3, NaCl, ethanol, and various yarns.
4：Experimental Procedures and Operational Workflow:
Ag NWs are synthesized and dispersed in ethanol. Yarns and PDMS fibers are prepared and modified. The assembly instrument is used with set parameters (e.g., assembly speed
5：2 r/min, temperature 150°C) to coat fibers by dipping them in Ag NWs solution and evaporating the solvent. In situ optical microscopy observes the assembly process. Data Analysis Methods:
Resistance is measured using a two-point probe method. Morphology is characterized by SEM. Mechanical stability is tested through bending and washing cycles, with data analyzed for changes in resistance.
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