Synthesis of Well-Aligned Multi-Walled Carbon Nanotubes by Floating Catalyst Chemical Vapor Deposition

Abstract

Well-aligned multi-walled carbon nanotube (MWNT) arrays were grown by floating catalyst chemical vapor deposition (CVD) on quartz substrate. The MWNTs in arrays had a uniform diameter of 30-50nm and high degree of graphitization. We find that catalyst nanoparticles with different sizes can be separated and deposit at different position by carrier gas flow under gravity effect in floating catalyst CVD. It is one of the main reasons that lead to the growth of well-aligned MWNTs.