Describe laser method to manufacture CNT.
1 Answer

In 1995, Smalley and co-workers produced carbon nanotubes using laser ablation technique.

In laser ablation technique, a high power laser was used to vaporize carbon from a graphite target at high temperature. Both MWCNTs and SWCNTs can be produced with this technique.

It uses laser vaporization of graphite rods with a 50:50 mixture of CO and NI powder at 1200 0C followed by heat treatment in vacuum at 1000 0 C to remove fullerenes.

The initial laser vaporization pulse was followed by a second pulse to vaporize the target more uniformly.

The material thus produced appears as mat of ropes 10-20 mm in diameter and upto 100 nanometre or more in length.

Carbon nanotubes produced by laser ablation were purer up to 90% and have a very narrow distribution of diameter.

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