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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structural and surface modifications of carbon nanotubes when submitted to high temperature annealing treatments
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Structural and surface modifications of carbon nanotubes when submitted to high temperature annealing treatments

机译：经受高温退火处理后碳纳米管的结构和表面改性

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摘要

Multiwall carbon nanotubes (MWCNTs) were synthesized using a chemical vapour deposition procedure using acetylene as source of carbon, iron pentacarbonyl as catalyst and an inert carrier gas. An aliquot of these MWCNTs was heat-treated at 2873 K under inert atmosphere (Ar). The two carbon nanotube samples where characterized using high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy, nitrogen adsorption at 77 K, Raman spectroscopy, and immersion calorimetry in toluene, methanol and methylcyclohexane. HRTEM images confirmed that high-temperature treatment removed amorphous carbon, the graphene layers being better graphitized, and also some structural changes inside the cylindrical mesopores took place. Immersion enthalpies in toluene, in which molecules are present as aromatic functions, indicated the existence of specific π-π electronic interactions between such molecules and the surface of heat-treated MWCNTs.
机译：使用乙炔作为碳源，五羰基铁作为催化剂和惰性载气，采用化学气相沉积法合成了多壁碳纳米管（MWCNT）。将这些MWCNT的等分试样在惰性气氛（Ar）下在2873K下热处理。使用高分辨率透射电子显微镜（HRTEM），扫描电子显微镜，77 K的氮吸附，拉曼光谱和在甲苯，甲醇和甲基环己烷中的浸没量热法对这两个碳纳米管样品进行表征。 HRTEM图像证实高温处理去除了无定形碳，石墨烯层更好地石墨化，并且圆柱形中孔内部发生了一些结构变化。在甲苯中的浸入焓（其中的分子以芳族官能团存在）表明此类分子与热处理的MWCNT表面之间存在特定的π-π电子相互作用。

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