In this study, Fe–Mo–MgO catalysts for the synthesis of carbon nanotubes (CNTs) were prepared using the combustion method and CNTs were synthesized through catalytic chemical vapor deposition. The combustion time was controlled to 0.5, 1, 2, 3, 5, 10, and 24 h in the catalyst preparation stage. The residual carbon contents after the combustion stage and the morphologies of synthesized CNTs were also analyzed. The diameter, yield, and crystallinity of the synthesized CNTs were found to remarkably vary according to the combustion time in the catalyst preparation process. The amount of residual carbon in the catalyst considerably affects the purity, crystallinity, diameter and its distribution, and wall number of CNTs. Based on the yield and crystallinity, CNTs synthesized using the catalyst with a combustion time of 3 h were determined to be the most appropriate for application in field emitters

    Abstract
    1 Introduction
    2 Experimental
        2.1 Materials
        2.2 Catalyst preparation
        2.3 Synthesis of t-MWCNTs
        2.4 Characterization of catalysts and t-MWCNTs
    3 Results and discussion
        3.1 Characterization of catalysts
        3.2 t-MWCNTs
    4 Conclusion
    Acknowledgements 
    References

• Sumin Kim(Department of Advanced Chemicals & Engineering, Graduate School Chonnam National University)
• In Ji Gang(Department of Advanced Chemicals & Engineering, Graduate School Chonnam National University)
• Young Soo Park(Korea Institute of Carbon Convergence Technology)
• Jong Hun Han(School of Chemical Engineering, Chonnam National University)