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

Abstract

The huge molecular cluster {Fe 30 Mo 72 } has been used as a source of catalyst nanoparticles in catalytic chemical vapour deposition (CCVD) process of carbon nanotubes (CNTs) synthesis. Thermal decomposition of {Fe 30 Mo 72 } in air is shown by X-ray diffraction analysis to produce iron molybdate, which is converted to alloyed Fe-Mo and Fe nanoparticles at elevated temperature and reduction environment. These nanoparticles supported on MgO, catalyse the growth of single-walled, double-walled and/or multi-walled CNTs depending on the active metal loading and ratio of methane and hydrogen in the feedstock. The structural parameters of the products are studied by transmission electron microscopy and Raman spectroscopy. The best CNT samples are tested as field electron emitters.

One-step chemical vapor deposition synthesis and supercapacitor performance of nitrogen-doped porous carbon–carbon nanotube hybrids

“…Furthermore, these metals have a lower linear absorption coefficient in comparison with heavier Mo. Actually, the XRD analysis of the decomposition products of {Ni 4 Mo 12 }, {Co 4 Mo 12 }, and {Fe 30 Mo 72 } cluster compounds in air have revealed the presence of the phases NiMoO 4 and CoMoO 4 [ 22 ] as well as Fe 2 (Mo 4 ) 3 [ 29 ]. The reduction of these oxides in a CH 4 /H 2 flow at 900 °C yields bimetallic particles as has been shown in our previous investigation [ 22 ].…”

Nanocarbon Photonics and Optoelectronics

“…The productive discussions during the meeting (which has been held on 19–24 March 2017) were provided by perfect organization and nice natural environment, including ski slopes, at Krasnaya Polyana resort (Sochi, Russia). The contributions (in total an amount of 30) of this Special Issue are covering research work related to production, characterization and application of the nanocarbon materials which include diamonds, carbon nanotubes, graphene other types of nanocarbon materials, and their composites . Traditionally for the NPO Workshop series there is also some portion of reports devoted to non‐carbon materials demonstrating properties and phenomena analogous to those observed for nanocarbons.…”