Direct evidence for highly developed graphene in PAN-based carbon fibers
Direct evidence for highly developed graphene in PAN-based carbon fibers
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DOI：
10.1016/j.cartre.2021.100136
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
K. Ono;T. Tomai;T. Ishii;K. Kurushima;S. Inamoto;B. Rutz;Fumihiko Tanaka
中科院分区：
文献类型：
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作者：
K. Ono;T. Tomai;T. Ishii;K. Kurushima;S. Inamoto;B. Rutz;Fumihiko Tanaka
尽管纳米碳（例如石墨烯）具有高机械性能，被认为是最强的材料，但它们不能充分用作结构材料。作为替代方案，使用聚丙烯腈（PAN）基碳纤维。在这项研究中，PAN基碳纤维的高机械性能进行了研究，通过原子分辨率的纳米结构成像。采用石墨烯制备技术来提取PAN基碳纤维内的纳米结构。观察到长约100 nm、宽约10 nm的晶格条纹明显大于先前报道的微晶尺寸。此外，从莫尔图案的基面的重建图像，它显示了在一个大的区域的乱层结构。结果表明，PAN基碳纤维的高强度和高模量是由于结晶结构的相互交织在微晶和非晶基体之间传递应力所致。这项研究的结果将有助于提高散装碳的性能，这在许多工业领域发挥着重要作用。
Despite high mechanical properties of nanocarbons, such as graphene, which is believed to be the strongest material, they cannot be sufficiently utilized as structural materials. As an alternative, polyacrylonitrile (PAN)-based carbon fibers are used. In this study, the high mechanical properties of PAN-based carbon fibers were investigated by imaging their nanostructures with atomic resolution. A graphene preparation technique was employed to extract nanostructures within the PAN-based carbon fibers. Lattice fringes with length ˃ 100 nm and width ˃ 10 nm were observed to be significantly larger than the crystallite sizes reported previously. Moreover, a reconstruction image of the basal plane from the Moiré pattern is presented, which shows the turbostratic structure over a large region. It is suggested that the intertwined nature of the crystalline structures transmitted stress between the crystallites and amorphous matrix, which led to the high strength and modulus of the PAN-based carbon fibers. The findings of this study will be useful for enhancing the properties of bulk carbons, which play an important role across numerous industrial fields.