Abstract

Owing to the rapid expansion of preparing a low-cost and pure carbon nanotubes (CNTs) from large available raw materials as cheap carbon precursors and catalyst depositions via chemical vapor deposition process, Algerian condensate gas over Ni/Al₂O₃ was used in this study. Response surface methodology was utilized to assess and optimize the preparation parameters. Synthesis of CNTs was studied as a function of three independent parameters: catalyst/condensate-gas weight ratio (5–10 wt %), synthesis time (30-120 min) and temperature (700–1000 °C). Optimum conditions for the CNTS-synthesis were found to be 5%, 112 min and 1000 °C, for catalyst/condensate gas mass ratio, synthesis time and temperature, respectively. Under these conditions, Raman spectrum indicates high values of (IG/ID), which means high-quality CNTs. Examination by SEM and HRTEM revealed that the CNTs grown under optimum conditions had diameters of 10 nm. The carbon yield predicted at the optimum process conditions was 81.76%. Conclusively, the pure and uniformed CNTs can be produced with high yield by the conversion of available-cheap resources via CVD-method. This method is practical, realistic, feasible in industrial scale and thus can reduces the cost manufacture of CNTs, which may help increase the impact of these remarkable materials in many fields.

摘要

由于通过化学气相沉积工艺从大量可用原材料作为廉价碳前体和催化剂沉积制备低成本和纯碳纳米管（CNTs）的迅速扩展，阿尔及利亚在 Ni/Al ₂ O _{3上的凝析气}本研究中使用。响应面法用于评估和优化制备参数。研究了碳纳米管的合成作为三个独立参数的函数：催化剂/冷凝气体重量比（5-10 wt%）、合成时间（30-120 分钟）和温度（700-1000°C）。对于催化剂/冷凝气体的质量比、合成时间和温度，CNTS 合成的最佳条件分别为 5%、112 分钟和 1000 °C。在这些条件下，拉曼光谱显示 (IG/ID) 的高值，这意味着高质量的 CNT。通过 SEM 和 HRTEM 检查表明，在最佳条件下生长的 CNT 的直径为 10 nm。在最佳工艺条件下预测的碳收率为 81.76%。最终，通过 CVD 方法转化可用的廉价资源，可以高产率地生产纯净且均匀的 CNT。这种方法在工业规模上是实用的、现实的、可行的，因此可以降低碳纳米管的制造成本，这可能有助于增加这些卓越材料在许多领域的影响。