Synthesis of high-purity few-walled carbon nanotubes from ethanol/methanol mixture
Synthesis of high-purity few-walled carbon nanotubes from ethanol/methanol mixture
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DOI：
10.1021/cm061528r
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发表时间：
2006-11-28
影响因子：
8.6
通讯作者：
Liu, Jie
中科院分区：
文献类型：
--
作者：
Qi, Hang;Qian, Cheng;Liu, Jie
少壁碳纳米管（FWNT）可以使用乙醇作为碳源在简单的化学气相沉积（CVD）系统中合成。然而，由于催化剂载体上乙醇分子的分解，原料中总是含有大量的杂质，这使得纯化变得困难，导致纯化的纳米管的产率较低。在这里，我们报道使用乙醇/甲醇混合物作为碳源，可以制备高纯度的FWNT。通过简单的纯化过程，可以获得高纯度的FWNT。对乙醇/甲醇比例影响的系统研究揭示了样品纯度提高的根源。在所研究的生长条件下，乙醇充当碳源，而甲醇充当“碳质杂质去除剂”，去除沉积在MgO载体上的杂质并阻碍此类杂质的形成。
Few-walled carbon nanotubes (FWNTs) can be synthesized in a simple chemical vapor deposition (CVD) system using ethanol as the carbon source. However, the raw materials always contain a significant amount of impurities due to decomposition of ethanol molecules on the catalyst support, which makes the purification difficult, resulting in a low yield of purified nanotubes. Here, we report that with use of an ethanol/ methanol mixture as the carbon source, FWNTs with high purity can be prepared. Through a simple purification process, highly pure FWNTs can be obtained. A systematic study of the effect of ethanol/ methanol ratio revealed the origin for the improved purity of the sample. Under the growth conditions studied, ethanol acted as the carbon source while methanol acted as "carbonaceous impurity remover" to remove the impurities deposited on the MgO support and hindered the formation of such impurities.