The low-temperature synthesis (450-560 deg C) of single-walled carbon nanotubes (SWCNTs) on a triple-layered catalyst, Al/Fe/Mo, was performed using aromatic hydrocarbon radicals which were produced from the pyrolysis of C_2H_2. Two approaches were used; in the first, these hydrocarbon radicals were produced using a high-temperature heater (830 deg C), but the substrate where the SWCNTs were grown was placed on a thermal insulator above it such that the substrate was at a much lower temperature. In the second approach, a heated nozzle system operating at 830 deg C was used to introduce the hydrocarbon radicals onto the substrate which was located a few centimetres below it. Both these approaches rely on the thermal dissociation and recombination of C_2H_2 for the formation of complex high-order radicals, i.e. C_6H_9, C_5H_9, C_6H_(13), whose presence was confirmed by in situ mass spectroscopy. The density of SWCNTs deposited could be correlated directly with the concentration of these precursors.
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机译：使用由C_2H_2热解产生的芳族烃自由基在三层催化剂Al / Fe / Mo上进行单壁碳纳米管（SWCNT）的低温合成（450-560℃）。使用了两种方法;首先，使用高温加热器（830摄氏度）产生这些烃基，但是将生长有SWCNT的基板放在其上方的绝热体上，以使基板处于更低的温度。在第二种方法中，使用在830摄氏度下运行的加热喷嘴系统将烃基引入到位于其下方几厘米的基材上。这两种方法都依赖于C_2H_2的热解离和重组以形成复杂的高阶自由基，即C_6H_9，C_5H_9，C_6H_（13），其存在已通过原位质谱法得以证实。沉积的SWCNT的密度可以与这些前体的浓度直接相关。
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