空气中多壁碳纳米管的稳定性

Stability of multi-wall carbon nanotubes in air

1.
Department of mathematics and physics, College of Henan Engineering, Zhengzhou 450052 China;
2.
Laboratory of Material Physics, Zhengzhou University, Zhengzhou 450052|China

摘要: 采用化学气相沉积法（CVD），以二甲苯为碳源，二茂铁为催化剂制备了多壁碳纳米管(MWCNTs)。考察了纯化后的多壁碳纳米管在空气中的结构稳定性，利用电子显微技术及体积电阻率法研究了多壁碳纳米管在空气中的特性变化。结果表明：多壁碳纳米管在空气中存放时会被缓慢氧化而变短，氧化程度随空气中放置时间的延长而增加，15d后几乎完全转化为无定形碳。体积电阻率随氧化程度不同而不同。多壁碳纳米管在空气中不稳定，容易氧化，需要密闭保存。
- 多壁碳纳米管 /
- 化学气相沉积法 /
- 稳定性
Abstract: Multi-walled carbon nanotubes (MWCNTs) have been synthesized by chemical vapor deposition using xylenes as carbon precursors and ferrocene as a catalyst. The stability of the purified MWCNTs was investigated, their properties were characterized by SEM and volume electric resistivity. Results showed that MWCNTs exposed to air under ambient temperature will be slowly oxidized and shortened. The extent of oxidation increases with time, and MWCNTs were almost completely transformed into amorphous carbon after 15 d. The volume electric resistivity also varied as a result of oxidation. These results indicate that as-prepared MWCNTs should be kept in a well-closed container to prevent them from oxidization.

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