Flexible and conductive nanofiber-structured single yarn sensor for smart wearable devices
Flexible and conductive nanofiber-structured single yarn sensor for smart wearable devices
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DOI：
10.1016/j.snb.2017.06.062
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发表时间：
2017-11-01
影响因子：
8.4
通讯作者：
Qin, Xiaohong
中科院分区：
文献类型：
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作者：
Wu, Shaohua;Liu, Penghong;Qin, Xiaohong
导电纤维或纺织品因其在可穿戴设备中的潜在应用而具有吸引力。连续排列的组件（即束或纱线）的创建可以使单个纳米纤维在宏观器件中实现超常的电性能。在这项研究中，通过将新型静电纺丝方法与原位溶液聚合工艺相结合，制备了由芯鞘聚苯胺（PANI）/聚丙烯腈（PAN）纳米纤维组成的导电聚合物单纱。利用所制备的PANI/PAN单轴取向同轴纳米纤维纱线(UACNY)构建氨(NH3)传感器。我们证明，PANI/PAN UACNY 中的纳米纤维结构结构为 NH3 的自由扩散提供了高表面积，并且 PANI/PAN UACNY 的高度定向纳米纤维排列促进了单向电荷载流子转移，从而有效地单向传输电信号，这使得纱线传感器在室温下暴露于 10-2000 ppm NH3 时具有出色的灵敏度和快速响应/恢复。此外，基于纱线的传感器在 NH3 检测方面具有出色的再现性和稳定性。重要的是，PANI/PAN UACNY 传感器具有强大的机械强度和灵活性，可以使用各种纺织品成型技术（即针织、编织和刺绣技术）加工成特定的电子纺织品。柔性导电PANI/PAN UACNY由于其结构稳定、操作方便、优异的机械性能以及较高的气敏性能，有望应用于可穿戴智能纺织品的开发。 (C) 2017 Elsevier B.V. 保留所有权利。
Electrically conductive fibers or textiles are attractive for their potential applications in wearable devices. The creation of continuously aligned assembly (i.e., bundle or yarn) may enable the realization of supernormal electrical performance of individual nanofibers into macroscale devices. In this study, a conductive polymer based single yarn consisting of core-sheath polyaniline (PANI)/polyacrylonitrile (PAN) nanofibers was fabricated by combining a novel electro spinning method with in-situ solution polymerization process. The as-prepared PANI/PAN uniaxially aligned coaxial nanofiber yarn (UACNY) was utilized to construct an ammonia (NH3) sensor. We demonstrated that the nanofiber-structured construction in the PANI/PAN UACNY offered a high surface area for the free diffusion of NH3, and the highly-oriented nanofiber arrangement of the PANI/PAN UACNY facilitated the one-way charge carrier transfer for effectively unidirectional transmission of electrical signals, which both endowed the yarn sensor excellent sensitivity and fast response/recovery upon exposure to NH3 of 10-2000 ppm at room temperature. Furthermore, the yarn-based sensor presented excellent reproducibility and stability for NH3 detection. Importantly, the PANI/PAN UACNY sensor possessed robust mechanical strength with flexibility, which could be processed into defined electronic textiles using various textile-forming technologies, i.e., knitting, braiding, and embroidering techniques. The flexible and conductive PANI/PAN UACNY have the potential to be applied for the development of wearable smart textiles, due to their stable structure, handling convenience, excellent mechanical property, as well as high gas sensing performance. (C) 2017 Elsevier B.V. All rights reserved.