A Temperature Window for the Synthesis of Single-Walled Carbon Nanotubes by Catalytic Chemical Vapor Deposition of CH4over Mo2-Fe10/MgO Catalyst

Abstract

A temperature window for the synthesis of single-walled carbon nanotubes by catalytic chemical vapor deposition of CH4over Mo2-Fe10/MgO catalyst has been studied by Raman spectroscopy. The results showed that when the temperature is lower than 750 °C, there were few SWCNTs formed, and when the temperature is higher than 950 °C, mass amorphous carbons were formed in the SWCNTs bundles due to the self-decomposition of CH4. The temperature window of SWCNTs efficient growth is between 800 and 950 °C, and the optimum growth temperature is about 900 °C. These results were supported by transmission electron microscope images of samples formed under different temperatures. The temperature window is important for large-scale production of SWCNTs by catalytic chemical vapor deposition method.

Carbon Nanotube Synthesis Using Fe‐Mo/MgO Catalyst with Different Ratios of CH4 and H2 Gases

“…Analysis of the literature shows the possibility to synthesise SWCNTs and DWCNTs using MgO with the inserted Fe and Mo . Impregnation method used by us for the catalyst preparation is rather mild process and could not lead to the metal incorporation into support lattice.…”

“…The flow rate of carbon feeding gas in these processes had a minor effect on the CNT wall number. The optimal temperature for the SWCNT synthesis was determine as 900 °C . One of the general points in the synthesis of SWCNTs or DWCNTs is a ratio of Fe and Mo in a catalyst .…”

Preparation of Carbon Nanomaterials over Ni/ZSM-5 Catalyst Using Simplex Method Algorithm

“…Hydrocarbons are commonly used as a carbon source for the synthesis of carbon nanomaterials [11]. The use of methane is the most economical way to produce CNMs since methane is cheap and abundant [12][13][14][15].…”