Synthesis of single-walled carbon nanotubes by a fluidized-bed method

Composites Based on Conducting Polymers and Carbon Nanotubes

“…SWNTs have been successfully synthesized using a fluidized-bed method [60] that involves fluidization of a catalyst/support at high temperatures by a hydrocarbon flow.…”

“…These results are summarized inFigure 5.8. According to an early paper, the main Raman lines of VK SERS spectrum at l exc ¼ 1064 nm of PVK, C60 and PVK/C 60 films of about 150 nm thickness deposited on the rough Au support. (Reprinted with permission from Polymer, Spectroscopic evidence for the bulk polymerization of N-vinyl carbozole in the presence of single-walled carbon nanotubes by M. Baibarac, I. Baltog, S. Lefrant and P. Gomez-Romero, 48, 18, 5279.…”

A novel continuous process for synthesis of carbon nanotubes using iron floating catalyst and MgO particles for CVD of methane in a fluidized bed reactor

“…This situation is worsened by the growing CNTs forming an overlay that covers the catalyst particles which results in a decrease in the catalyst activity. These problems may be solved by fluidizing the catalyst particles in a confined reactor by using a gaseous carbon source heated to the synthesis temperature [16,17]. In a fluidized bed reactor, sufficient growing space, and proper mass and heat transfer lead to much higher quality and yield, uniform properties, and relatively perfect micro-structures of grown CNTs [18].…”

“…''Fixed bed'', ''floating catalyst'', and ''fluidized bed'' methods are the most common processes for the CVD growth of CNTs [16]. The efficiency of CNTs production in the fixed-bed reactor is severely limited by inhomogeneous gas-solid mixing along the catalyst bed, with the dense packing of the catalyst particle preventing CNTs production.…”

Preparation and characterization of multi-walled carbon nanotubes grown on transition metal catalysts

“…Silica offers high surface areas and good pore size characteristic 13 which allows for a high catalyst loadings (e.g. 60 wt% relative to silica) 14 and hence high yield CNTs growth. However, the large-scale production of high surface area silica (for example, MCM-41 or SBA-15) is time consuming and expensive.…”