论文标题
碳纳米管合成和作为宏观纤维的旋转，并由陶瓷反应器管辅助
Carbon nanotube synthesis and spinning as macroscopic fibers assisted by the ceramic reactor tube
论文作者
论文摘要
碳纳米管（CNT）的宏观纤维已成为一种理想的结构，以利用CNT构建块在从储能到结构复合材料的增强等应用中的出色特性。受控的合成和可伸缩性是进一步实现CNT纤维潜力的最紧迫的挑战之一。这种讲习班在浮动催化剂化学蒸气条件下在直接旋转方法中使用，在研究和行业中都使用，陶瓷反应器管在CNT增长中起着无调的积极作用，例如，当mullite（AL4+2xSI2-2xo10-X（x = 0.4））中，反应产量增加了一倍层，纯度或石墨程度。通过调节启动子的浓度，已经确认了不同碳源的行为，并且主要是单壁或多壁CNT。 Analysis of large Si-based impurities occasionally found in CNT fiber fabric samples, attributed to reactor tube fragments that end up trapped inthe porous fibers, indicate that the role of the reactor tube is in catalyzing the thermal decomposition of hydrocarbons, which subsequently react with floating Fe catalyst nanoparticles and produce extrusion of the CNTs and formation of an aerogel.反应堆气体分析证实，在没有FE催化粒子的情况下，碳源的广泛热分解发生，并且不同碳种类（例如二氧化碳和乙烯）的浓度对反应堆类型敏感。这些发现通过将前体分解与催化剂颗粒的CNT挤出来控制CNT纤维的开放新途径。
Macroscopic fibers of carbon nanotubes (CNT) have emerged as an ideal architecture to exploit the exceptional properties of CNT building blocks in applications ranging from energy storage to reinforcement in structural composites. Controlled synthesis and scalability are amongst the most pressing challenges to further materialize the potential of CNT fibers. This workshows that under floating catalyst chemical vapor conditions in the direct spinning method, used both in research and industry,the ceramic reactor tube plays an unsuspected active role in CNT growth, leading for example to doubling of reaction yield when mullite (Al4+2xSi2-2xO10-x(x = 0.4)) is used instead of alumina (Al2O3), but without affecting CNT morphology in terms of number of layers, purity or degree of graphitization. This behaviour has been confirmed for different carbon sources andwhen growing either predominantly single-walled or multi-walled CNTs by adjusting promotor concentration. Analysis of large Si-based impurities occasionally found in CNT fiber fabric samples, attributed to reactor tube fragments that end up trapped inthe porous fibers, indicate that the role of the reactor tube is in catalyzing the thermal decomposition of hydrocarbons, which subsequently react with floating Fe catalyst nanoparticles and produce extrusion of the CNTs and formation of an aerogel. Reactor gas analysis confirms that extensive thermal decomposition of the carbon source occurs in the absence of Fe catalystparticles, and that the concentration of different carbon species (e.g. carbon dioxide and ethylene) is sensitive to the reactor tube type. These finding open new avenues for controlled synthesis of CNT fibers by decoupling precursor decomposition from CNT extrusion at the catalyst particle.
