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首页> 外文期刊>Applied Surface Science >Catalytic Activity Of Fe, Co And Fe-co-mcm-41 For The Growth Of Carbon Nanotubes By Chemical Vapour Deposition Method
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Catalytic Activity Of Fe, Co And Fe-co-mcm-41 For The Growth Of Carbon Nanotubes By Chemical Vapour Deposition Method

机译：Fe，Co和Fe-co-mcm-41的化学气相沉积法对碳纳米管生长的催化活性

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摘要

Iron, cobalt and a mixture of iron and cobalt incorporated mesoporous MCM-41 molecular sieves were synthesised by hydrothermal method and used to investigate the rules governing their nanotube producing activity. The catalysts were characterised by XRD and N_2 sorption studies. The effect of the catalysts has been investigated for the production of carbon nanotubes at an optimised temperature 750 ℃ with flow rate of N_2 and C_2H_2 is 140 and 60 ml/min, respectively for a reaction time 10 min. Fe-Co-MCM-41 catalyst was selective for carbon nanotubes with low amount of amorphous carbon with increase in single-walled carbon nanotubes (SWNTs) yield at 750 ℃. Formation of nanotubes was studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. Transmission electron microscope and Raman spectrum was used to follow the quality and nature of carbon nanotubes formed and the graphitic layers and disordered band, which shows the clear evidence for the formation of SWNTs, respectively. The result propose that the diameter of the nanotubes in the range of 0.78-1.35 nm. Using our optimised conditions for this system, Fe-Co-MCM-41 showed the best results for selective SWNTs with high yield when compared with Fe-MCM-41 and Co-MCM-41.
机译：通过水热法合成了铁，钴以及掺入铁和钴的介孔MCM-41分子筛，并用于研究控制其纳米管生产活性的规则。通过XRD和N_2吸附研究表征了催化剂。研究了催化剂在优化温度750℃下制备碳纳米管的效果，N_2和C_2H_2的流速分别为140和60 ml / min，反应时间为10min。 Fe-Co-MCM-41催化剂对非晶碳含量低的碳纳米管具有选择性，在750℃时单壁碳纳米管（SWNTs）的产率增加。使用扫描电子显微镜（SEM），透射电子显微镜（TEM）和拉曼光谱研究了纳米管的形成。用透射电子显微镜和拉曼光谱跟踪形成的碳纳米管的质量和性质以及石墨层和无序带，这分别为形成SWNTs提供了明确的证据。结果表明，纳米管的直径在0.78-1.35nm的范围内。使用我们针对该系统优化的条件，与Fe-MCM-41和Co-MCM-41相比，Fe-Co-MCM-41对高产量的选择性单壁碳纳米管显示出最佳结果。

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