High-Quality Thin-Multiwalled Carbon Nanotubes Synthesized by Fe-Mo/MgO Catalyst Based on a Sol-Gel Technique: Synthesis, Characterization, and Field Emission
- Authors
- Dubey, Prashant; Choi, Sang Kyu; Choi, Ji Hoon; Shin, Dong Hoon; Lee, Cheol Jin
- Issue Date
- 6월-2010
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Carbon Nanotube; Thin-Multiwalled Carbon Nanotube; Synthesis; Sol-Gel Method; Field Emission
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.10, no.6, pp.3998 - 4006
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 10
- Number
- 6
- Start Page
- 3998
- End Page
- 4006
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/116300
- DOI
- 10.1166/jnn.2010.1984
- ISSN
- 1533-4880
- Abstract
- We synthesized thin-multiwalled carbon nanotubes (t-MWCNTs) using Fe-Mo/MgO catalyst by citrate precursor method based on a simple sol-gel technique. Synthesis of high-quality t-MWCNTs with uniform diameters was achieved in large-scale by catalytic decomposition of methane over Fe-Mo/MgO catalyst prepared under Ar-atmosphere. The produced t-MWCNTs had the outer diameters in the range of 4-8 nm, with a Gaussian average diameter of 6.6 +/- 0.1 nm and wall numbers in the range of of 4-7 graphenes. The product yield of the as-synthesized t-MWCNTs was over 450% relative to the used Fe-Mo/MgO catalyst, and TGA showed purity about 85%. The t-MWCNTs showed the low turn-on field about 1.24 V/mu m, corresponding to the current density of 0.1 mu A/cm(2), and the high emission current density of 10 mA/cm(2) at the applied electric field of 2.6 V/mu m. The t-MWCNTs indicate good emission stability without any fluctuation of emission current through a lifetime measurement for 20 h. It was confirmed that the field emission performance of t-MWCNTs was similar to DWCNTs and the field emission stability of t-MWCNTs was similar to MWCNTs.
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