Flexible and lightweight carbon nanotube (CNT)/thermoplastic polyurethane (TPU) conductive foam with a novel aligned porous structure was fabricated. The density of the aligned porous material was as low as 0.123 g·cm^–3. Homogeneous dispersion of CNTs was achieved through the skeleton of the foam, and an ultralow percolation threshold of 0.0023 vol % was obtained. Compared with the disordered foam, mechanical properties of the aligned foam were enhanced and the piezoresistive stability of the flexible foam was improved significantly. The compression strength of the aligned TPU foam increases by 30.7% at the strain of 50%, and the stress of the aligned foam is 22 times that of the disordered foam at the strain of 90%. Importantly, the resistance variation of the aligned foam shows a fascinating linear characteristic under the applied strain until 77%, which would benefit the application of the foam as a desired pressure sensor. During multiple cyclic compression-release measurements, the aligned conductive CNT/TPU foam represents excellent reversibility and reproducibility in terms of resistance. This nice capability benefits from the aligned porous structure composed of ladderlike cells along the orientation direction. Simultaneously, the human motion detections, such as walk, jump, squat, etc. were demonstrated by using our flexible pressure sensor. Because of the lightweight, flexibility, high compressibility, excellent reversibility, and reproducibility of the conductive aligned foam, the present study is capable of providing new insights into the fabrication of a high-performance pressure sensor.

中文翻译：

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基于碳纳米管/热塑性聚氨酯对准导电泡沫的柔性轻型压力传感器，具有出色的可压缩性和稳定性

制备了具有新型排列的多孔结构的柔性轻质碳纳米管（CNT）/热塑性聚氨酯（TPU）导电泡沫。排列的多孔材料的密度低至0.123 g·cm ^–3。通过泡沫的骨架实现了CNT的均匀分散，并获得了0.0023 vol％的超低渗透阈值。与无序泡沫相比，定向泡沫的机械性能得到提高，软质泡沫的压阻稳定性得到显着改善。取向的TPU泡沫在50％的应变下的抗压强度提高了30.7％，取向的泡沫的应力是应变为90％时无序泡沫的22倍。重要的是，取向泡沫的电阻变化在所施加的应变下直至77％都显示出令人着迷的线性特性，这将有利于将泡沫用作所需的压力传感器。在多次循环压缩释放测量中，对齐的导电CNT / TPU泡沫在电阻方面表现出出色的可逆性和可重复性。这种良好的功能得益于沿着定向方向由梯形单元组成的对齐多孔结构。同时，通过使用我们的柔性压力传感器演示了人体运动检测，例如步行，跳跃，下蹲等。由于导电对齐泡沫的轻质，柔韧性，高压缩性，出色的可逆性和可重复性，本研究能够为高性能压力传感器的制造提供新的见解。深蹲等通过使用我们的柔性压力传感器进行了演示。由于导电对齐泡沫的轻质，柔韧性，高压缩性，出色的可逆性和可重复性，本研究能够为高性能压力传感器的制造提供新的见解。深蹲等通过使用我们的柔性压力传感器进行了演示。由于导电对齐泡沫的轻质，柔韧性，高压缩性，出色的可逆性和可重复性，本研究能够为高性能压力传感器的制造提供新的见解。