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3D-Printed Flexible Piezoresistive Sensors for Stretching and Out-of-Plane Forces
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2021-08-18 , DOI: 10.1002/mame.202100437 Dong Xiang 1 , Zixi Zhang 1 , Yuanpeng Wu 1, 2 , Jiabin Shen 3 , Eileen Harkin‐Jones 4 , Zhenyu Li 1 , Ping Wang 1 , Chunxia Zhao 1 , Hui Li 1 , Yuntao Li 1
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2021-08-18 , DOI: 10.1002/mame.202100437 Dong Xiang 1 , Zixi Zhang 1 , Yuanpeng Wu 1, 2 , Jiabin Shen 3 , Eileen Harkin‐Jones 4 , Zhenyu Li 1 , Ping Wang 1 , Chunxia Zhao 1 , Hui Li 1 , Yuntao Li 1
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Conductive polymer composites (CPCs) of carbon nanotubes (CNTs) and graphite nanosheet (GNP)-filled thermoplastic polyurethane (TPU) are 3D-printed into flexible piezoresistive sensors via fused filament fabrication. The sensor, with a customized lever-cross structure, allows detection of stretching and out-of-plane forces of different magnitudes and frequencies. The out-of-plane force direction is obtained by combing the relative electrical resistance change in the cross section of the sensor with a force analysis. The 75-CNT/25-GNP sensor (CNT-to-GNP mass ratio of 75%-to-25%) demonstrates excellent sensing performance at a total nanoparticle loading of 3 wt%. The linearity of the 75-CNT/25-GNP sensor is 0.98, while those of the 100-CNT and 50-CNT/50-GNP sensors are 0.93 and 0.86, respectively. The gauge factor of the 75-CNT/25-GNP sensor is 52% higher than that of the 100-CNT sensor, and its sensing strain range is 79% above that of the 50-CNT/50-GNP sensor. Excellent sensing stability is demonstrated for the 75-CNT/25-GNP sensor after 1500 stretching (out-of-plane force) cycles. The synergistic effect of CNTs and GNPs on sensing performance of piezoresistive sensors is clearly shown in this study.
中文翻译：
用于拉伸和平面外力的 3D 打印柔性压阻传感器
碳纳米管 (CNT) 和石墨纳米片 (GNP) 填充的热塑性聚氨酯 (TPU) 的导电聚合物复合材料 (CPC) 通过熔丝制造 3D 打印到柔性压阻传感器中。该传感器具有定制的杠杆交叉结构，可以检测不同幅度和频率的拉伸和平面外力。通过将传感器横截面中的相对电阻变化与力分析相结合，可以获得面外力方向。75-CNT/25-GNP 传感器（CNT 与 GNP 的质量比为 75% 至 25%）在纳米颗粒总负载量为 3 wt% 时表现出出色的传感性能。75-CNT/25-GNP 传感器的线性度为 0.98，而 100-CNT 和 50-CNT/50-GNP 传感器的线性度分别为 0.93 和 0.86。75-CNT/25-GNP 传感器的应变系数比 100-CNT 传感器高 52%，其传感应变范围比 50-CNT/50-GNP 传感器高 79%。75-CNT/25-GNP 传感器在 1500 次拉伸（面外力）循环后表现出出色的传感稳定性。本研究清楚地显示了碳纳米管和 GNP 对压阻传感器传感性能的协同作用。
更新日期：2021-08-18
中文翻译：
用于拉伸和平面外力的 3D 打印柔性压阻传感器
碳纳米管 (CNT) 和石墨纳米片 (GNP) 填充的热塑性聚氨酯 (TPU) 的导电聚合物复合材料 (CPC) 通过熔丝制造 3D 打印到柔性压阻传感器中。该传感器具有定制的杠杆交叉结构，可以检测不同幅度和频率的拉伸和平面外力。通过将传感器横截面中的相对电阻变化与力分析相结合，可以获得面外力方向。75-CNT/25-GNP 传感器（CNT 与 GNP 的质量比为 75% 至 25%）在纳米颗粒总负载量为 3 wt% 时表现出出色的传感性能。75-CNT/25-GNP 传感器的线性度为 0.98，而 100-CNT 和 50-CNT/50-GNP 传感器的线性度分别为 0.93 和 0.86。75-CNT/25-GNP 传感器的应变系数比 100-CNT 传感器高 52%，其传感应变范围比 50-CNT/50-GNP 传感器高 79%。75-CNT/25-GNP 传感器在 1500 次拉伸（面外力）循环后表现出出色的传感稳定性。本研究清楚地显示了碳纳米管和 GNP 对压阻传感器传感性能的协同作用。
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