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首页> 外文期刊>Journal of nano research >An Efficient Method to Completely Remove Catalyst Particles from Hipco Single Walled Carbon Nanotubes
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An Efficient Method to Completely Remove Catalyst Particles from Hipco Single Walled Carbon Nanotubes

机译：从Hipco单壁碳纳米管中完全去除催化剂颗粒的有效方法

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摘要

An efficient, economic and easy method for removing 99% of catalyst particle from high pressure carbon monoxide (HiPCO) single walled carbon nanotubes (SWCNT) is reported. The experiment is carried out at low temperature followed by acid treatment. The process exploited here is oxidation of the carbon impurities to gaseous phase as COsub2 /suband removal of oxidized catalyst debris using acid treatment. Stability of SWCNT at these temperatures does not allow any damage to the nanotubes, however, some damage is observed which can be attributed to the oxidation of catalyst particles and their removal. The purified sample showed very lesso amount of amorphous carbon and catalyst impurities. Characterization of the material was carried out using Raman spectroscopy, Thermogravimetric analysis (TGA), Scanning electron microscopy (SEM), Transmission electron microscope (TEM) and Energy Dispersive Spectroscopy (EDAX). The resultant SWCNT were found to be highly pure. EDAX spectroscopy showed that the purified sample had only 0.5wt% of catalyst impurities whereas the as prepared once have 9.09wt%, also, TGA curve of the treated sample showed a very significant increase in the oxidation temperature indicating less defect and less catalyst content in the sample. The non- carbonaceous residue after purification is about 0.3%. highly efficient purification of SWCNT using the proposed method. This work provides a basis on removing the catalyst particles completely.
机译：报道了一种从高压一氧化碳（HiPCO）单壁碳纳米管（SWCNT）去除99％催化剂颗粒的有效，经济，简便的方法。实验在低温下进行，然后进行酸处理。此处利用的过程是将碳杂质氧化为CO 2 气相并使用酸处理去除氧化的催化剂碎片。 SWCNT在这些温度下的稳定性不会对纳米管造成任何损害，但是，观察到一些损害，这可归因于催化剂颗粒的氧化和其去除。纯化的样品显示非常少/没有量的无定形碳和催化剂杂质。使用拉曼光谱，热重分析（TGA），扫描电子显微镜（SEM），透射电子显微镜（TEM）和能量分散光谱（EDAX）对材料进行表征。发现所得的SWCNT是高度纯的。 EDAX光谱显示，纯化的样品仅含有0.5wt％的催化剂杂质，而一次制备的样品中只有9.09wt％的样品，TGA曲线也显示了氧化温度的显着提高，表明较少的缺陷和较少的催化剂含量。例子。纯化后的非碳质残余物为约0.3％。使用所提出的方法高效纯化SWCNT。这项工作为完全去除催化剂颗粒提供了基础。

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