Carbon Nanotube Fiber Based Stretchable Conductor
Carbon Nanotube Fiber Based Stretchable Conductor
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DOI：
10.1002/adfm.201202174
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发表时间：
2013-02
影响因子：
19
通讯作者：
M. Zu;Qingwen Li;Guojian Wang;J. Byun;T. Chou
中科院分区：
文献类型：
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作者：
M. Zu;Qingwen Li;Guojian Wang;J. Byun;T. Chou
碳纳米管（CNT）基连续纤维是一种在宏观尺度上保持单个CNT优异性能的CNT组装体，属于一种极具吸引力的新型电子材料，在电子、传感和导线等领域具有潜在的应用前景。在这里，通过简单的预应变-然后-屈曲方法制造基于CNT纤维的可拉伸导体。为了增强纤维和聚二甲基硅氧烷（PDMS）基底之间的界面结合，从而促进屈曲形成，CNT纤维在被转移到预应变基底之前首先涂覆有液体PDMS的薄层。CNT纤维变形成大块的纤维，这是由于在从预应变释放纤维/基底组件时产生的压缩力。这种屈曲形状与以前在其他类似系统中观察到的正弦形状完全不同。另一方面，在碳纤维/PDMS复合膜上进行的类似实验由于较高的纤维弯曲模量而导致广泛的纤维断裂。此外，CNT纤维/PDMS复合膜在高达40%的预应变水平的多次拉伸和释放循环下显示出非常小的电阻变化（± 1%），这表明作为可拉伸导体的性能具有出色的稳定性和可重复性。
Carbon nanotube (CNT) based continuous fiber, a CNT assembly that could potentially retain the superb properties of individual CNTs on a macroscopic scale, belongs to a fascinating new class of electronic materials with potential applications in electronics, sensing, and conducting wires. Here, the fabrication of CNT fiber based stretchable conductors by a simple prestraining‐then‐buckling approach is reported. To enhance the interfacial bonding between the fibers and the poly(dimethylsiloxane) (PDMS) substrate and thus facilitate the buckling formation, CNT fibers are first coated with a thin layer of liquid PDMS before being transferred to the prestrained substrate. The CNT fibers are deformed into massive buckles, resulting from the compressive force generated upon releasing the fiber/substrate assembly from prestrain. This buckling shape is quite different from the sinusoidal shape observed previously in otherwise analogous systems. Similar experiments performed on carbon fiber/PDMS composite film, on the other hand, result in extensive fiber fracture due to the higher fiber flexural modulus. Furthermore, the CNT fiber/PDMS composite film shows very little variation in resistance (≈1%) under multiple stretching‐and‐releasing cycles up to a prestrain level of 40%, indicating the outstanding stability and repeatability in performance as stretchable conductors.