Question

anyone knows exactly how Carbon Nanotubes are fabricated?

Answer 1

I cannot remember, but I managed to dig up some scribbles which say that polyacrylonitrile is first heated in air and than heated in argon at high temperatures to form carbon fibres, not nanotubes, but still close.

Answer 2

multitude of ways dude, depending on whether they want to go for bulk or purtiy, single walled or multi
http://www.azonano.com/article.aspx?ArticleID=1561