The role of two sulfur sources, such as, thiophene and carbon disulfide, on the structure (graphitic layer) of carbon nanotube cotton (CNT-c) has been investigated during floating catalyst chemical vapour deposition (FC-CVD). The CNT-c assembly at 1200°C with ferrocene and ethanol as catalyst and carbon precursors respectively was found to be predominantly consisting of (a) single-walled carbon nanotubes (SWCNTs) in the presence of carbon disulfide and (b) multi-walled carbon nanotubes (MWCNTs) in the presence of thiophene. The finding was based on detailed characterization using Raman spectroscopy, transmission electron microscopy and scanning electron microscopy. A possible mechanism for having two different structures has been discussed. The experimental results demonstrated that the interaction of sulfur source with the catalyst particle strongly influenced the number of graphitic layers of CNTs in the CNT-c assembly.

在浮动催化剂化学气相沉积（FC-CVD）过程中，已研究了两种硫源，例如噻吩和二硫化碳，对碳纳米管棉（CNT-c）的结构（石墨层）的作用。发现在1200°C下分别以二茂铁和乙醇为催化剂和碳前驱体的CNT-c组件主要由（a）在存在二硫化碳的情况下的单壁碳纳米管（SWCNT）和（b）在多壁的情况下构成噻吩存在下的碳纳米管（MWCNT）。该发现基于使用拉曼光谱，透射电子显微镜和扫描电子显微镜的详细表征。已经讨论了具有两种不同结构的可能机制。