Abstract
The formation of carbon encapsulated Fe nanoparticles (Fe@C), in the process of growing single-/double- walled carbon nanotubes (S/DWCNTs) from methane was investigated by quantitatively analyzing the samples at different reaction time. We found that the ratio of Fe@C to the total Fe sustainably increased after the terminated growth of S/DWCNTs. We proposed that thin graphite layers produced in the middle stage of the reaction, as a mechanical barrier, covered the surface of MgO support and prevented Fe nanoparticles from contacting carbon source for the growth of S/DWCNTs via the root growth mode. These results suggested that the synthesis of desirable S/DWCNTs and undesirable Fe@C impurities was a consecutive process, not a paralleled one as proposed in many previous works. It provided useful information for the controlled synthesis of S/DWCNTs with high purity and high selectivity.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
