碳纳米管纤维表面化学的X射线光电子能谱学高级分析
Advanced Surface Chemistry Analysis of Carbon Nanotube Fibers by X-ray Photoelectron Spectroscopy
摘要：
碳纳米管纤维是一种具有特殊性能组合的材料，包括比碳纤维更高的韧性、高于金属的导电性、大比表面积（250 $\frac{m^2}{g}$）和高电化学稳定性。因此，它们是各种多功能结构中的关键组分，其将增强的机械性能与有效的界面能量储存/转移过程相结合。这项工作提出了一个彻底的XPS研究碳纳米管纤维进行不同的纯化和化学处理，包括空间分辨微XPS同步辐射测量。主要特征是固有的高度$sp^2$共轭，导致强等离子体带和半金属价带线形。在纵向石墨化方面，这种高度的CNT完美性有助于解释所报道的本体性质，包括高电导率和热导率以及可获得的量子电容。还存在有机杂质，主要是在纤维合成期间作为副产物形成的重碳质分子，并且其吸附在CNT上。硫是CNT生长反应中使用的促进剂，存在于这些表面杂质中并与Fe催化剂相关联。强烈吸附的表面杂质的观察结果与CNT纤维的高延展性一致，归因于界面润滑性。
英文摘要：
Carbon nanotube fibers are materials with an exceptional combination of properties, including higher toughness than carbon fibers, electrical conductivity above metals, large specific surface area (250 $\frac{m^2}{g}$) and high electrochemical stability. As such, they are a key component in various multifunctional structures combining augmented mechanical properties with efficient interfacial energy storage/transfer processes. This work presents a thorough XPS study of CNT fibers subjected to different purification and chemical treatments, including spatially-resolved micro XPS synchrotron measurements. The dominant feature is an inherently high degree of $sp^2$ conjugation, leading to a strong plasmonic band and a semi-metallic valence band lineshape. This high degree of CNT perfection in terms of longitudinal graphitization helps to explain reported bulk properties including the high electrical and thermal conductivity, and accessible quantum capacitance. There is also presence of organic impurities, mostly heavy carbonaceous molecules formed as by-products during fiber synthesis and which are adsorbed on the CNTs. Sulfur, a promoter used in the CNT growth reaction, is found both in these surface impurities and associated with the Fe catalyst. The observation of strongly-adsorbed surface impurities is consistent with the high ductility of CNT fibers, attributed to interfacial lubricity.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
