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Continuous production of carbon nanotubes - A review

机译：连续生产碳纳米管-评论

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Carbon nanotubes (CNTs) up to now are the most researched materials of the 21st century with an international intention of growing industrial quantities due to their superior properties for use in many applications. Thus far large quantities of carbon nanotube scan be grown in a continuous manner by both arc as well as chemical vapour deposition methods. In this paper, an innovative approach of feeding gases, a carbon precursor (solid or gases) and a catalyst into the reaction zone is reviewed. This is followed by a study of the reaction process concerning how the method is initiated, the effect of growth environment and catalyst on CNTs as well as the discharging mechanism for the final carbon products. A study of the arc method consists of a novel way of growing CNTs in a liquid solution from an arc discharge generated by carbon rods, by growing CNTs in a plasma zone using carbon gases or solid carbon and a more direct method of using carbon tape as the anode for the synthesized source are also reported. In the case of the chemical vapour deposition (CVD) method, some use a horizontal reactor and some use a vertical reactor with all having different installed devices for use in continuous feeding and discharging of resources and products respectively. Additionally, problems regarding the CNT yield and some issues that have not been taken into consideration by others, are discussed. At the end of the review, an additional mechanism to integrate catalyst preparation and carbon nanotube purification into the current research synthesizing process for future study is proposed for a highly productive continuous CNT synthesis process.
机译：迄今为止，碳纳米管（CNTs）是21世纪研究​​最多的材料，由于其在许多应用中的优越性能，国际上有意增加工业量。因此，电弧和化学气相沉积方法都以连续的方式生长了大量的碳纳米管。在本文中，综述了一种将气体，碳前体（固体或气体）和催化剂送入反应区的创新方法。接下来是对反应过程的研究，涉及如何启动该方法，生长环境和催化剂对CNT的影响以及最终碳产物的排放机理。电弧法的研究包括一种通过碳棒产生的电弧放电在液态溶液中生长CNT的新颖方法，通过使用碳气体或固体碳在等离子区中生长CNT以及一种更直接的使用碳带作为方法的方法还报道了合成源的阳极。在化学气相沉积（CVD）方法的情况下，一些使用卧式反应器，而某些使用立式反应器，所有反应器均具有不同的安装装置，分别用于资源和产品的连续进料和排放。此外，讨论了有关CNT产量的问题以及其他问题尚未考虑的问题。在审查结束时，提出了一种将催化剂制备和碳纳米管纯化集成到当前研究合成过程中以供将来研究的附加机制，以实现高生产率的连续CNT合成过程。

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