化学气相沉积法低温合成螺旋碳纳米管

Low temperature synthesis of helical carbon nanotubes by chemical vapor deposition

以水溶性氯化钠负载Fe做催化剂,直接通过化学气相沉积法在没有掺杂任何含硫气体噻吩的条件下催化裂解乙炔在450℃下进行反应制备纳米碳材料。产物通过扫描电子显微镜和高分辨透射电子显微镜进行了表征。结果表明：在该条件下制备了选择性较高的螺旋碳纳米管,其直径在25~200nm之间,绝大部分碳纳米管都有着非常规整的螺旋性并且其螺距很短。所制备螺旋碳纳米管晶格没有好的连续性,中间有断痕出现,并且排列也很不规则,为一种有缺陷的石墨结构。

The reactions were carried out at 450℃ using iron supported on sodium chloride as catalyst to prepare nano-carbon materials. The samples were examined by scanning electron microscopy and high resolution transmission electron microscopy. The results showed that helical carbon nanotubes with high purity and diameters in the range 25-200nm were obtained. The nanotubes were composed of unclosed graphene layers.