金镍复合膜上碳纳米管的定向生长及生长过程中金的作用

以金镍复合膜作催化剂，在96%的高氢气浓度下实现了碳纳米管的定向生长，并对其生长过 程进行了深入探讨.结果表明，高氢气浓度下碳纳米管生长的实现与本实验所选用的催化剂 ——金镍复合膜有密切关系.催化剂中金的参与，促进了碳在催化剂中的扩散，提高了碳在 催化剂中的活度.与催化剂中没有金的情况相比较，金的参与有利于镍吸收气氛中的碳，从 而使镍更容易达到碳饱和，有利于在高的氢气浓度下实现碳纳米管的定向生长. 关键词： 金镍复合膜 高氢气浓度 原子氢 碳活度

Vertically aligned carbon nanotubes grown on Au/Ni films and the role of Au in the grown process

The vertically aligned carbon nanotubes( CNTs) were synthesized on Au/Ni catalyst films by plasma enhanced hot filament chemical vapor deposition( PE-HFCVD) me thod at 96% concentration of hydrogen. The growing process of CNTs on Au/Ni film was discussed. The realization of the vertically aligned CNTs grown at high hyd rogen concentration can be attributed to the adoption of the Au/Ni catalyst film s. The element Au promoted the diffusion of the carbon and improved the activity of carbon in catalyst. By comparing with the use of only Ni as catalyst, the Au in Au/Ni catalyst film can increase the carbon absorption, so carbon could be e asily saturated in the catalyst and the vertically aligned CNTs were achieved at a high hydrogen concentration.