We report a new strategy towards the control of carbon nanotube (CNT) structure and continuous fibre formation using a floating catalyst direct spinning CVD process. In the procedures used to date, a sulphur promoter precursor is added to significantly enhance the rate of CNT formation in the floating catalyst synthesis. Within the reaction zone, the rapidly grown nanotubes self-assemble into bundles, followed by their continuous spinning into fibres, yarns, films or tapes. In this paper we demonstrate a catalyst control strategy in the floating catalyst system, where the CNT formation process is independent of the presence of a promoter but leads to successful spinning of the macroscopic carbon nanotube assemblies with specific morphology, high purity (Raman D/G 0.03) and very narrow diameter range (0.8–2.5?nm). This can be achieved by the control of catalyst precursor decomposition and subsequent formation of homogeneous nano-sized catalyst particles.
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机译：我们报告了一种使用浮动催化剂直接纺丝CVD工艺控制碳纳米管（CNT）结构和连续纤维形成的新策略。在迄今为止使用的程序中，添加了硫促进剂前体以显着提高漂浮催化剂合成中CNT的形成速率。在反应区内，快速生长的纳米管会自组装成束，然后连续不断地纺成纤维，纱线，薄膜或带。在本文中，我们演示了在浮动催化剂系统中的催化剂控制策略，其中CNT的形成过程与助催化剂的存在无关，但可成功实现具有特定形态，高纯度的宏观碳纳米管组件的自旋（拉曼D / G 0.03）和非常窄的直径范围（0.8–2.5？nm）。这可以通过控制催化剂前体的分解并随后形成均相的纳米级催化剂颗粒来实现。
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