碳纳米管纤维的机电响应与碳纳米管网络在电磁力驱动下的致密化过程相关。研究碳纳米管纤维的电学性能与机电响应的相互影响对分析碳纳米管纤维的微观结构具有理论意义, 对相关柔性电子器件的开发亦具有指导意义。本文通过分析双氧水氧化和碘修饰的碳纳米管纤维的内部结构特点, 探索碳纳米管导电网络与机电响应之间的关系。结果表明, 无定型碳等杂质阻碍电子传输和碳纳米管网络变形。经双氧水氧化处理后, 纤维内部碳纳米管表面杂质减少, 碳纳米管间的范德华力提高, 碳纳米管网络的变形能力增强, 由温度升高导致纤维弹性模量下降的负面影响减弱; 在碘修饰的碳纳米管纤维内部, 碳-碘键有效增强碳纳米管之间的相互结合力, 显著提高其力学性能和导电性, 但阻碍碳纳米管网络的收缩, 导致机电响应变弱。双氧水氧化处理比碘修饰更有利于提高碳纳米管纤维在机电响应中的收缩变形能力。

The electromechanical response (EMR) of carbon nanotube (CNT) fibers is related to the densification process of the CNT network driven by electromagnetic force. The study of the interaction between the electrical properties and the electromechanical response of carbon nanotubes is of great theoretical significance for exploring the microstructure of carbon nanotube fibers and developing the related flexible electronic devices. This study investigated the relationship between the conductive pathway network and EMR, by analyzing the internal structural characteristics of the CNT fibers after undergoing hydrogen peroxide oxidation and iodine modification. The results show that impurities such as amorphous carbon impeded electron transport and deformation of CNT networks. After hydrogen peroxide oxidation treatment, he carbon nanotube surface impurities inside the fibres were reduced, the van der Waals forces between carbon nanotubes were increased, the deformation of the carbon nanotube network was enhanced, and the negative effect of the decrease in the elastic modulus of the fibres caused by the increase in temperature was weakened. In the case of iodine-decorated CNT fibers, carbon-iodine bonds effectively strengthened the interaction between CNTs, but hinders the contraction of the carbon nanotube network, resulting in a weaker electromechanical response. Hydrogen peroxide oxidation treatment is more beneficial than iodine modification to improve the shrinkage and deformation ability of carbon nanotube fibres in the electromechanical response.