Cap formation engineering: from opened C60 to single-walled carbon nanotubes.
Cap formation engineering: from opened C60 to single-walled carbon nanotubes.
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DOI：
10.1021/nl1010178
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发表时间：
2010-08
期刊：
影响因子：
10.8
通讯作者：
Xuechun Yu;Jin Zhang;W. Choi;Jae-Young Choi;J. M. Kim;L. Gan;Zhongfan Liu
中科院分区：
文献类型：
--
作者：
Xuechun Yu;Jin Zhang;W. Choi;Jae-Young Choi;J. M. Kim;L. Gan;Zhongfan Liu
结构控制，特别是手性控制，仍然是单壁碳纳米管（SWNTs）合成中的一个重大挑战。我们在这里报告一个合理的方法来工程富勒烯帽生长单壁碳纳米管与控制结构，通过化学气相沉积（CVD）。通过热氧化打开富勒烯二酮产生半球形帽，可以在其开口端引发单壁碳纳米管生长。这些盖帽的尺寸和结构可以通过调整热氧化温度来设计。结果表明，帽的生长前处理是不可缺少的单壁碳纳米管的成功生长。用于热氧化的温度强烈地影响帽的尺寸和结构，并进一步确定所生长的单壁碳纳米管的直径分布。较强的氧化处理（在空气中450 ℃氧化）促进形成较薄的SWNT，而较弱的氧化处理（在空气中350 ℃氧化）导致较宽的SWNT。有趣的是，单壁碳纳米管使用富勒烯帽显示阶梯状的直径分布相对于单壁碳纳米管催化Fe纳米粒子。这种使用开口C（60）的帽工程提供了一种潜在的方法来生长具有受控结构的SWNT。
Structural control, and especially chirality control, remains a significant challenge in the synthesis of single-walled carbon nanotubes (SWNTs). We report herein a rational approach to engineering fullerene caps for growing SWNTs with controlled structures via chemical vapor deposition (CVD). Opening of fullerendione via thermal oxidation yields hemispherical caps which can initiate SWNT growth at their open ends. The size and structure of these caps can be engineered by tuning the temperature of thermal oxidation. Results show that pregrowth treatment of the cap is indispensable to successful growth of SWNTs. The temperature used for thermal oxidation strongly affects the size and structure of the cap and further determines the diameter distribution of the as-grown SWNTs. Stronger oxidation treatments (450 degrees C oxidation in air) promote formation of thinner SWNTs, while weaker oxidation treatments (350 degrees C oxidation in air) lead to wider SWNTs. Interestingly, SWNTs made using fullerene caps show steplike diameter distributions relative to SWNTs catalyzed by Fe nanoparticles. This cap engineering using opened C(60) provides a potential approach to grow SWNTs with controlled structures.