Growth of carbon nanotubes with controlled morphologies
Dong L., Jiao J., Mosher CL., Foxley S.
The alignment, orientation and morphologies of multi-walled carbon nanotubes (MWNTs) can be tailored by controlling catalyst deposition on porous silicon substrates. During the growth of MWNTs, H 2 promoted the growth of carbon nanotubes and prevented the formation of amorphous carbon particles. With the introduction of H 2 , the average diameter of MWNTs decreased from 130 nm to 15 nm, and the average growth rate of nanotubes increased from 50 nm/s to 145 nm/s. The use of CH 4 as the carbon source resulted in single-walled carbon nanotubes (SWNTs) with an average diameter of 2 nm, and the use of CH 4 as the carbon source resulted in MWNTs with an average diameter of 15 nm.