Electromechanical coupling of isotropic fibrous networks with tailored auxetic behavior induced by water-printing under tension
Electromechanical coupling of isotropic fibrous networks with tailored auxetic behavior induced by water-printing under tension
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DOI：
10.1039/d0tc05526c
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发表时间：
2021-03
影响因子：
6.4
通讯作者：
Jinyuan Zhang;Sheila M. Goodman;Heather G. Wise;Anthony B. Dichiara;J. Chung
中科院分区：
文献类型：
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作者：
Jinyuan Zhang;Sheila M. Goodman;Heather G. Wise;Anthony B. Dichiara;J. Chung
了解拉胀材料的机电耦合为提高压阻传感器的灵敏度提供了独特的机会。关于随机纤维网络的拉胀行为的报道相对较少，因为它们的泊松膨胀比其他适应周期性排列结构的拉胀设计更不明显。在这项研究中，层次纸浆碳纳米管网络的拉胀响应是通过水打印引发的局部拉伸微断裂定制的。多壁碳纳米管（MWCNTs）和纤维素纤维之间的界面连接被分解和重组，以诱导湿CNT纸复合材料（CPC）网络的屈曲。在水印刷区域实现了-49.5的泊松比。CPC传感器的压阻特性在宽动态范围（6-500 000 Pa）内表现出高灵敏度（3.3 kPa−1）。新型水打印CPC的拉胀行为为高性能和廉价的可穿戴设备铺平了道路。
Understanding the electromechanical coupling of auxetic materials offers unique opportunities to enhance the sensitivity of piezoresistive sensors. Reports on the auxetic behavior of random fiber networks have been relatively scarce due to their less pronounced Poisson's expansions than other auxetic designs adapting periodically arranged structures. In this study, the auxetic response of hierarchical pulp-carbon nanotube networks is tailored through the localized tensional micro-fracture initiated by water-printing. The interfacial junctions among multiwalled carbon nanotubes (MWCNTs) and cellulose fibers are disintegrated and reorganized to induce the buckling of a wet CNT paper composite (CPC) network. The Poisson's ratio of −49.5 is achieved at the water-printed region. The resulting piezoresistive properties of CPC sensors exhibit high sensitivity (3.3 kPa−1) over a wide dynamic range (6–500 000 Pa). The novel auxetic behavior of water-printed CPC paves the way for high performance and inexpensive wearable devices.