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以二甲硫醚为碳源,Fe/MgO为催化剂,采用化学气相沉积法制备了碳纳米管。通过SEM、Raman、XRD、TEM表征方法研究了实验合成条件对碳纳米管产物的形貌和微结构的影响。结果表明,二甲硫醚的蒸汽浓度对碳纳米管的形貌和产量有重要影响。较高的二甲硫醚浓度会使催化剂的活性降低,制备出的碳纳米管较短且石墨化程度也较差。生长碳纳米管的最佳二甲硫醚浓度范围为2.69%～3.86%,且碳纳米管产物中有Y型碳纳米管的生成,并对其生长机理进行了初步讨论。
Using dimethyl sulfide as a carbon source and Fe / MgO as a catalyst, carbon nanotubes were prepared by chemical vapor deposition. The effects of experimental conditions on the morphology and microstructure of CNTs were investigated by SEM, Raman, XRD and TEM. The results show that the dimethyl sulfide concentration of steam on the morphology and yield of carbon nanotubes have a significant impact. Higher dimethylsulfide concentrations decrease the activity of the catalyst, resulting in shorter carbon nanotubes and poorer graphitization. The optimum concentration of dimethyl sulfide for growing carbon nanotubes ranged from 2.69% to 3.86%. The formation of Y-type carbon nanotubes in the product was also discussed. The growth mechanism was discussed.