Abstract Strain sensors are essential for health monitoring of complex-shaped structures. Here, carbon nanotube thin films (CNTFS) with different double-layers were fabricated on a flexible polyethylene terephthalate substrate using layer-by-layer self-assembly technique, and their resistance behaviors and piezoresistive sensing performances were comprehensively conducted. Results show that the assembled layers of CNTFS are evenly and compactly deposited with about 7–15 μm, and the resistance decreases with the increase in the assembly layer number. The piezoresistive sensing behavior increases first and then decreases with the increase in the number of assembly layers along with compression or tension cyclic loading; the nine-double-layer CNTFS shows the best linearity, sensitivity, hysterics, and repeatability of 3.22%, 0.12684/mm, 2.16%, and 3.06%, respectively.

中文翻译：

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自组装碳纳米管柔性薄膜的制备及其压阻传感行为

摘要 应变传感器对于复杂形状结构的健康监测至关重要。在此，采用逐层自组装技术在柔性聚对苯二甲酸乙二醇酯基板上制备了不同双层的碳纳米管薄膜（CNTFS），并对其电阻行为和压阻传感性能进行了综合研究。结果表明，CNTFS的组装层沉积均匀致密，厚度约为7~15 μm，电阻随着组装层数的增加而减小。随着组装层数的增加以及压缩或拉伸循环载荷的增加，压阻传感行为先增加后减少；九双层 CNTFS 表现出最佳的线性度、灵敏度、滞后性和重复性，为 3.22%，0.12684/mm，