| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 106 === In recent years, the topics of wearable electronic devices have been gained popularity since the rapid development of technology. The wearable electronic devices not only improve our living quality, but also provide a complete health management system by combining with the medical, communications technology, and so on. The burgeoning field of electronic textile (e-textile) is about incorporating electronic functionality into textiles [1-5], and the products also have both the characteristics of light, fabric drape and washable properties of the textiles and the functions of the luminescence[1], power generation [3], sensing [4] and communication [4-5], etc. of electronic devices, can be used to sense and react to the changes of conditions or stimuli of the environment.
The development of flexible, stretchable and highly conductive electrode with a low-cost and facile fabrication technique is critical for the practical applications in the future. Furthermore, electrospinning is the most innovative technology of spinning, with many advantages, such as low-cost production, easily controlled with the fiber morphology and a large number of continuous production, etc., can be used for the fabrication of multi-functional nanofibers.[6-7] Based on previous techniques in our lab.[6-7], we presented two smart textile applications of a stretchable electrode based on
electrospun elastomeric nanofibers/silver nanowires (AgNW) composites by using a simple, low-cost process, and polymer light-emitting electrochemical cells (PLECs) devices. The details of explorations are summarized as follows:
1. Fabricating the Highly Conductive and Stretchable Epoxy/Acrylonitrile Butadiene Rubber Blend Fiber Coated with AgNW-Waterborne Polyurethane Composites (Chapter 2): In the chapter, we have demonstrated a new concept of the fabrication of highly conductive and stretchable Epoxy/NBR-20 fiber spray-coated with AgNW2.0WPU1.0 by the combination of electrospinning and spray-coating techniques. Epoxy/NBR-20 fiber with large surface area and strong affinity to silver nanowires can absorb AgNW2.0WPU1.0 into the prepared fiber, which provides a conductive network within fiber during the stretching and recovery test. Hence, such conductive fiber can maintain low resistance (less than 150 Ω) at the mechanical strain up to 40%, and it can also sustain at least 200 stretching/release cycles without obvious changes in resistance. Furthermore, this stretchable conductive fiber can turn on the LED with a small applied voltage, and it can sustain the movement of human body. The present study suggests that the Epoxy/NBR-20 fiber spray-coated with AgNW2.0WPU1.0 possesses great mechanical property and high conductivity, which has potential applications in stretchable smart textiles.
2. Fabrication of Flexible Polymer Light-Emitting Electrochemical Cells (PLECs) for Textile Applications (Chapter 3): In the chapter, we used the light-emitting material Super Yellow (SY) mixed with polyelectrolyte of crosslinkable trimethylolpropane ethoxylate triacrylate (ETPTA) and fluoroelastomer to discuss the effects on the efficiency and fabricated the flexible single-layer PLECs on the textile. The PLECs containing the movable ions was sandwiched to constitute ITO/light-emitting layer/Al structure that generated the visible light by electroluminescence. Light emission in the device with a low turn-on voltage of 5.0 V and reaches a peak brightness of 355.44 cd m-2 at 8 V. The PLECs on textile remain emissive despite under harsh treatment of severely pinched during light emission.
It is expected that the full fabric-based design can combine with clothes, or link with the human body directly. By combining the PLECs with textile, the fabric light-emitting devices and stretchable fiber-based light-emitting devices are the development trends in the future. We expect that fiber-based light-emitting devices will be highly useful in the design of next generation electronic systems and commercialized in variety of the electronic devices.
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