Abstract
Carbon nanotubes can become a cheaper alternative to carbon fibers based on traditional technology. The conditions for successful longer carbon nanotube catalytic growth are formulated. Optimization is needed in order to break through three general limitations, which prevent nanotubes from reaching great length: slow growth; growth quenching, which is manifested by stopping growth due to catalyst capsulation or poisoning or due to other reasons; and competition between the nanotube elongation and the nanotube thickening. The experimental results on CNT growth show the possibility of producing centimeter-long nanotubes suitable as precursors for manufacturing super-strength carbon threads and also new kinds of functional nanocomposites.
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