Lobo Luís Sousa, Carabineiro Sónia A C
LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.
Nanomaterials (Basel). 2021 Jan 8;11(1):143. doi: 10.3390/nano11010143.
Carbon formation on steel has recently become an active research area with several important applications, using either carbon nanotubes (CNTs) or graphene structures. The production of vertically aligned CNT (VACNT) forests with combined metals has been explored with important results. Detailed kinetics is the best approach to understand a mechanism. The growth behavior seems complex but can be simplified through the knowledge of the three more common alternative reaction mechanisms/routes. The time required to optimize the production and properties might be reduced. The mechanistic proposal reported in 1971 was better explained recently. The volcano shape Arrhenius plot reported is observed only when Fe, Co, and Ni are used as reaction catalysts. Other metals are catalytically active at higher temperatures, following a different route, which does not require surface catalysis decomposition of the reactive gas. CH and low olefins react well, but CH is not reactive via this surface catalysis route. Optimizing production of CNTs, research work is usually based on previous experience, but solid-state science-based studies are available.
近年来，利用碳纳米管（CNT）或石墨烯结构，钢表面的碳形成已成为一个活跃的研究领域，并具有若干重要应用。人们探索了用复合金属制备垂直排列的碳纳米管（VACNT）森林，并取得了重要成果。详细的动力学是理解机理的最佳方法。生长行为看似复杂，但通过了解三种更常见的替代反应机理/途径可以简化。优化生产和性能所需的时间可能会减少。1971年报道的机理提议最近得到了更好的解释。只有当铁、钴和镍用作反应催化剂时，才会观察到所报道的火山形状的阿累尼乌斯图。其他金属在较高温度下具有催化活性，遵循不同的途径，该途径不需要反应气体的表面催化分解。CH和低级烯烃反应良好，但CH不通过这种表面催化途径反应。优化碳纳米管的生产时，研究工作通常基于以往经验，但也有基于固态科学的研究。
