Carbon nanotubes (CNTs) has drawn extensive attention for flexible thermoelectric (TE) applications due to its unique electronic properties, mechanical robustness, and lightweight, however, its low figure of merit (ZT) greatly limits its practical use in device application. In this study, we tuned the carrier concentration of pre-formed CNT yarns by a practical vapor-phase doping process under atmospheric pressure to circumvent the limitations of solution-phase doping such as invasiveness to the pre-formed chemical structures in the CNT yarns. 7,7,8,8-tetracyanoquinodimethane (TCNQ) and 2,3,5,6-tetrafluoro-tetracyanoquinodimethane (F₄TCNQ), were adopted as p-type dopants. Charge transfer between the dopant molecules and CNT yarns enhanced their electrical conductivity, and the ZT, which is in the range of 10⁻²–10⁻³, improved by 1.5 and 1.6-fold compared to a pristine yarn by the TCNQ- and F₄TCNQ-doping, respectively.

碳纳米管（CNT）由于其独特的电子特性、机械强度和重量轻而在柔性热电（TE）应用中引起了广泛关注，但其低品质因数（ZT）极大地限制了其在器件应用中的实际应用。在这项研究中，我们在大气压下通过实用的气相掺杂工艺调整了预成型 CNT 纱线的载流子浓度，以规避溶液相掺杂的局限性，例如对 CNT 纱线中预成型化学结构的侵入性。7,7,8,8-四氰基醌二甲烷 (TCNQ) 和 2,3,5,6-四氟-四氰基醌二甲烷 (F ₄TCNQ)，被用作 p 型掺杂剂。掺杂剂分子和 CNT 纱线之间的电荷转移增强了它们的导电性，并且与 TCNQ- 和 F 的原始纱线相比，ZT 在 10 ^-2 –10 ^-3范围内提高了 1.5 和 1.6 倍₄ TCNQ-掺杂，分别。