Researchers expect carbon nanotube (CNT) yarns as an alternative to metallic wiring. However, the electrical properties of CNT yarns remain relatively low, necessitating further improvement. In this study, we fabricated CNT yarns by dry-spinning and performed several post-synthesis treatments to enhance the electrical properties. Polymer solution impregnation increased the electrical conductivity 1.82 × and the current capacity 1.58 × , attributable to densification of the CNT yarn bundles. Graphitization (GT) increased the electrical conductivity 2.58 × and the current capacity 1.83 × , attributable to purification of the crystalline structure. Iodinemonochloride/dichloromethane (ICl/DCM) doping increased the electrical conductivity 1.79 × and the current capacity 1.31 × , attributable to the increased electron carrier density. We achieved further enhancement by a two-step treatment—GT and ICl/DCM doping—resulting in a 4.88 × increase in conductivity and reaches a maximum of 5.12 × 10⁵ S/m. We observed greater doping effects after GT, which increased the electrical conductivity 1.89 × , whereas doping for pristine CNT yarn only increased the electrical conductivity 1.79 × . The X-ray photoelectron spectra of CNT yarn in each step indicated a positive relationship between the peak area of the π–π∗ transition component and the electrical conductivity. Therefore, we hypothesize that purification of the crystalline structure increases the electron carrier density by doping.

研究人员希望碳纳米管 (CNT) 纱线可以替代金属布线。然而，碳纳米管纱线的电性能仍然相对较低，需要进一步改进。在这项研究中，我们通过干纺制造了 CNT 纱线，并进行了几次合成后处理以提高电性能。由于 CNT 纱线束的致密化，聚合物溶液浸渍使电导率增加了 1.82 倍，电流容量增加了 1.58 倍。由于晶体结构的纯化，石墨化 (GT) 使电导率增加了 2.58 倍，电流容量增加了 1.83 倍。由于电子载流子密度的增加，一氯化碘/二氯甲烷 (ICl/DCM) 掺杂使电导率增加了 1.79 倍，电流容量增加了 1.31 倍。⁵ 秒/米。我们观察到 GT 后更大的掺杂效应，这使电导率增加了 1.89 × ，而对原始 CNT 纱线的掺杂仅将电导率增加了 1.79 × 。每个步骤中CNT纱线的X射线光电子谱表明π-π*跃迁分量的峰面积与电导率之间存在正相关关系。因此，我们假设晶体结构的纯化通过掺杂增加了电子载流子密度。