Carbon nanotubes-based nanocomposites have gained a great amount of attraction and play a key role in the realization of strain sensors owing to their remarkable physical properties. In this study, the piezoresistivity of multi-walled carbon nanotubes (MWCNTs)/epoxy-based nanocomposite-based strain sensor under static tensile load is examined using electrochemical impedance spectroscopy. Morphological examinations show that MWCNTs are randomly and homogeneously distributed in the epoxy polymer matrix. A simplified resistance constant phase element model is proposed and validated by impedance spectrum to fit the impedance spectra and the equivalent circuit parameters are extracted under uniaxial static load. Impedance results suggest that depending on the frequency regions, the sensor exhibits different responses under loading. Moreover, the proposed sensor gives high sensitivity, linearity and low hysteresis under cyclic quasi-static loading and unloading that makes the sensor a promising candidate for practical strain sensor applications.

中文翻译：

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单轴循环静态拉伸载荷下碳纳米管/环氧树脂纳米复合材料压阻应变传感器的电阻抗分析

基于碳纳米管的纳米复合材料因其卓越的物理特性而获得了极大的吸引力，并在应变传感器的实现中发挥了关键作用。在这项研究中，使用电化学阻抗谱检查了多壁碳纳米管 (MWCNT)/基于环氧树脂的纳米复合材料在静态拉伸载荷下的压阻性。形态学检查表明，多壁碳纳米管随机且均匀地分布在环氧聚合物基质中。提出了一种简化的电阻恒相元模型，并通过阻抗谱进行了验证，以拟合阻抗谱，并提取了单轴静载荷下的等效电路参数。阻抗结果表明，根据频率区域，传感器在负载下表现出不同的响应。而且，