Optimized geometry of single‐walled carbon nanotubes (SWCNTs) is vital to high‐performance transparent conductive films (TCFs). Herein, the geometry of SWCNTs, i.e., tube diameter, bundle length, and bundle diameter, are successfully tuned by introducing carbon dioxide (CO₂) into floating catalyst chemical vapor deposition (FC‐CVD), where carbon monoxide (CO) is used as a carbon source and ferrocene as a catalyst precursor. Both tube diameter and bundle length increase with an increment of CO₂ concentration, and the yield of SWCNTs can be significantly promoted with the appropriate amount of CO₂. The role of CO₂ in this behavior is further rationalized as enhancing CO decomposition or carbon dissolution into catalysts. The TCFs based on SWCNTs with optimized geometry by CO₂ exhibit improved performance up to 86.8 Ω sq⁻¹ at 90% transmittance after AuCl₃ doping, achieving about 50% reduction of sheet resistance compared to the TCFs without CO₂. The use of CO₂ for directly tuning growth of SWCNTs blazes a new trail in the field of SWCNT based TCFs.

中文翻译：

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高性能透明导电膜的浮动催化剂CVD中通过CO2调整SWCNT的几何形状

单壁碳纳米管（SWCNT）的优化几何形状对于高性能透明导电膜（TCF）至关重要。在此，通过将二氧化碳（CO ₂）引入使用一氧化碳（CO）的浮式催化剂化学气相沉积（FC-CVD）中，成功地调整了SWCNT的几何形状，即管径，束长度和束直径。作为碳源和二茂铁作为催化剂前体。管直径和束长度都随CO ₂浓度的增加而增加，而适量的CO ₂可以显着提高SWCNT的产率。CO ₂的作用这种行为被进一步合理化为增强CO分解或碳在催化剂中的溶解。基于由CO与优化的几何形状的SWCNT的TCFs中₂表现出改进的性能最高可达86.8Ω平方^-1后AUCL在90％的透射率₃掺杂，达到大约薄层电阻的减少50％，比无CO的TCFs中₂。使用CO ₂直接调节SWCNT的生长开创了基于SWCNT的TCF领域的一条新道路。