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Controllable growth of uniform carbon nanotubes/carbon nanofibers on the surface of carbon fibers

机译：碳纤维表面上均匀的碳纳米管/碳纳米纤维的可控生长

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摘要

An efficient method to obtain a good and uniform catalyst coating on the surface of carbon fibers was developed by modifying carbon fibers with electrochemical anodic oxidation (EAO), the homogeneous growth of carbon nanotubes (CNTs)/carbon nanofibers (CNFs) was then achieved on the surface of carbon fibers via chemical vapor deposition (CVD). According to the study on the effect of both the catalyst type and concentration on CNT/CNF growth, it was found that when the concentration of catalyst precursor is higher than a critical value, catalytic efficiency decreases apparently with the increase of catalyst concentration regardless of the catalyst type employed. The influence of CVD temperature on tensile strength of CNT/CNF-grafted carbon fibers was also investigated. At low temperatures, such as 500 degrees C and 550 degrees C, growing CNTs/CNFs without any degradation of mechanical properties of carbon fibers was successfully achieved, which demonstrated the feasibility of growing CNTs/CNFs directly on carbon fibers. A mathematical model for CNT growth was established to explain the experimental results successfully, which can be used to accurately control the morphology and yield of CNTs/CNFs grown on the surface of carbon fibers. Hence it provides theoretical guidance for the large-scale synthesis processes.
机译：通过用电化学阳极氧化（EAO）改性碳纤维，提出了一种在碳纤维表面上获得良好且均匀的催化剂涂层的有效方法。碳纤维表面通过化学气相沉积（CVD）。根据催化剂类型和浓度对CNT / CNF生长的影响的研究，发现当催化剂前体的浓度高于临界值时，催化效率随着催化剂浓度的增加而明显降低，而与催化剂浓度无关。使用的催化剂类型。还研究了CVD温度对CNT / CNF接枝碳纤维拉伸强度的影响。在低温（例如500摄氏度和550摄氏度）下，成功实现了生长CNT / CNF，而碳纤维的机械性能没有任何下降，这证明了直接在碳纤维上生长CNT / CNF的可行性。建立了碳纳米管生长的数学模型，成功地解释了实验结果，可用于精确控制碳纤维表面生长的碳纳米管/碳纳米管的形貌和产率。因此，它为大规模合成过程提供了理论指导。

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