通过碳酸镁的化学还原制备锥形碳纳米管
Growth of conical carbon nanotubes by chemical reduction of MgCO3.
作者信息
Lou Zhengsong, Chen Changle, Chen Qianwang
机构信息
Hefei National Laboratory for Physical Sciences at Microscale and Department of Materials Science & Engineering, University of Science and Technology of China, Jinzhai Road, Hefei 230026, China.
出版信息
J Phys Chem B. 2005 Jun 2;109(21):10557-60. doi: 10.1021/jp0453717.
Carbon nanotubes were synthesized by chemical reduction of magnesium carbonate with metallic lithium at 600 degrees C. The nanotubes with an average length of 13 microm and diameter of 60 nm are made of short coaxial conical cylinder tubular graphite sheets with their cone axis parallel to the tube axis, different from the ordinary carbon nanotubes, composed of concentric cylindrical graphite layers with their normal perpendicular to the tube axis. It is suggested that nanoscale rough surface of lithium formed at the interface between supercritical carbon dioxide and liquid lithium takes the roles of both the reductant for reduction of carbon dioxide to carbon and the template for growth of carbon nanotubes.
通过在600摄氏度下用金属锂对碳酸镁进行化学还原合成了碳纳米管。这些平均长度为13微米、直径为60纳米的纳米管由短的同轴圆锥圆柱管状石墨片制成，其圆锥轴与管轴平行，这与普通的碳纳米管不同，普通碳纳米管由同心圆柱石墨层组成，其法线垂直于管轴。有人认为，在超临界二氧化碳与液态锂的界面处形成的锂的纳米级粗糙表面既充当了将二氧化碳还原为碳的还原剂，又充当了碳纳米管生长的模板。
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