Wang Shenggao

Effect of particle density on the aligned growth of carbon nanotubes

Aligned carbon nanotubes (CNTs) were prepared on Nicoated Ni substrate by microwave plasma chemical vapor deposition (MWPCVD) with a mixture of methane and hydrogen gases at temperature of 550°C. The experimental results show a direct correlation between the alignment of CNTs and the density of the catalyst particles at low temperature. When the particle density is high enough, among CNTs there are strong interactions that can inhibit CNTs from growing randomly. The crowding effect among dense CNTs results in the aligned growth of CNTs at low temperature.Aligned carbon nanotubes (CNTs) were prepared on Nicoated Ni substrate by microwave plasma chemical vapor deposition (MWPCVD) with a mixture of methane and hydrogen gases at temperature of 550°C. The experimental results show a direct correlation between the alignment of CNTs and the density of the catalyst particles at low temperature. When the particle density is high enough, among CNTs there are strong interactions that can inhibit CNTs from growing randomly. The crowding effect among dense CNTs results in the aligned growth of CNTs at low temperature.

Synthesis of Carbon Nanotubes by MWPCVD at Low Temperature

Growth of carbon nanotubes (CNTs) at low temperature is very important to the applications of nanotubes. In this paper, under the catalytic effect of cobalt nanoparticles supported by SiO2, CNTs were synthesized by microwave plasma chemical vapor deposition (MWPCVD) below 500°C. It demonstrates that MWPCVD can be a very efficient process for the synthesis of CNTs at low temperature.

Reduction of Ilmenite Through Microwave Plasma

Ilmenite was reduced through microwave plasma-assisted chemical vapor deposition with continuously flowing hydrogen and methane gas. The reduction products were analyzed by XRD and SEM technology, and the component products were TiO2-Carbon Nanotubes (CNTs) composite powders. The reduction process was in good agreement with the Jander equation. Compared with other reduction process by kinetics analysis, microwave plasma could significantly facilitate the reduction process at low temperature.

Growth of Aligned Carbon Nanotubes through Microwave Plasma Chemical Vapor Deposition

Aligned carbon nanotubes (CNTs) were synthesized on glass by microwave plasma chemical vapor deposition (MWPCVD) with a mixture of methane and hydrogen gases at the low temperature of 550 °C. The experimental results show that both the self-bias potential and the density of the catalyst particles are responsible for the alignment of CNTs. When the catalyst particle density is high enough, strong interactions among the CNTs can inhibit CNTs from growing randomly and result in parallel alignment.