Improved crystallinity of double-walled carbon nanotubes after a high-temperature thermal annealing and their enhanced field emission properties

Seung Il Jung; Sung Ho Jo; Hee Sung Moon; Jae Myung Kim; Dong Sik Zang; Cheol Jin Lee

doi:10.1021/jp0676078

Improved crystallinity of double-walled carbon nanotubes after a high-temperature thermal annealing and their enhanced field emission properties

Seung Il Jung, Sung Ho Jo, Hee Sung Moon, Jae Myung Kim, Dong Sik Zang, Cheol Jin Lee

School of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

49 Citations (Scopus)

Abstract

High-purity double-walled carbon nanotubes (DWCNTs) were synthesized by catalytic decomposition of CH₄ over Fe-Mo/MgO catalyst at 900 °C. After purification, the DWCNTs were annealed at 1300 °C in vacuum condition of 10^-5 Torr. The DWCNTs before and after the high-temperature thermal annealing were characterized using scanning electron microscopy, high-resolution transmission electron microscopy, Raman spectroscopy, and thermogravimetric analysis. It was observed that the annealed DWCNTs had enhanced crystallinity and reduced defects. In addition, the DWCNTs showed better field emission performance after high-temperature thermal annealing. The annealed DWCNTs indicated the turn-on field of about 1.16 V/μm at 0.1 μA/cm² and the threshold field of about 2.12 V/μm at 1.0 mA/cm². Moreover, the annealed DWCNTs exhibited better emission stability compared with the nonannealed DWCNTs. Such a remarkable improvement of field emission performance was attributed to the enhanced crystallinity and reduced defects of the annealed DWCNTs.

Original language	English
Pages (from-to)	4175-4179
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	11
DOIs	https://doi.org/10.1021/jp0676078
Publication status	Published - 2007 Mar 22

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "Improved crystallinity of double-walled carbon nanotubes after a high-temperature thermal annealing and their enhanced field emission properties",

abstract = "High-purity double-walled carbon nanotubes (DWCNTs) were synthesized by catalytic decomposition of CH4 over Fe-Mo/MgO catalyst at 900 °C. After purification, the DWCNTs were annealed at 1300 °C in vacuum condition of 10-5 Torr. The DWCNTs before and after the high-temperature thermal annealing were characterized using scanning electron microscopy, high-resolution transmission electron microscopy, Raman spectroscopy, and thermogravimetric analysis. It was observed that the annealed DWCNTs had enhanced crystallinity and reduced defects. In addition, the DWCNTs showed better field emission performance after high-temperature thermal annealing. The annealed DWCNTs indicated the turn-on field of about 1.16 V/μm at 0.1 μA/cm2 and the threshold field of about 2.12 V/μm at 1.0 mA/cm2. Moreover, the annealed DWCNTs exhibited better emission stability compared with the nonannealed DWCNTs. Such a remarkable improvement of field emission performance was attributed to the enhanced crystallinity and reduced defects of the annealed DWCNTs.",

author = "Jung, {Seung Il} and Jo, {Sung Ho} and Moon, {Hee Sung} and Kim, {Jae Myung} and Zang, {Dong Sik} and Lee, {Cheol Jin}",

year = "2007",

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doi = "10.1021/jp0676078",

language = "English",

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T1 - Improved crystallinity of double-walled carbon nanotubes after a high-temperature thermal annealing and their enhanced field emission properties

AU - Jung, Seung Il

AU - Jo, Sung Ho

AU - Moon, Hee Sung

AU - Kim, Jae Myung

AU - Zang, Dong Sik

AU - Lee, Cheol Jin

PY - 2007/3/22

Y1 - 2007/3/22

N2 - High-purity double-walled carbon nanotubes (DWCNTs) were synthesized by catalytic decomposition of CH4 over Fe-Mo/MgO catalyst at 900 °C. After purification, the DWCNTs were annealed at 1300 °C in vacuum condition of 10-5 Torr. The DWCNTs before and after the high-temperature thermal annealing were characterized using scanning electron microscopy, high-resolution transmission electron microscopy, Raman spectroscopy, and thermogravimetric analysis. It was observed that the annealed DWCNTs had enhanced crystallinity and reduced defects. In addition, the DWCNTs showed better field emission performance after high-temperature thermal annealing. The annealed DWCNTs indicated the turn-on field of about 1.16 V/μm at 0.1 μA/cm2 and the threshold field of about 2.12 V/μm at 1.0 mA/cm2. Moreover, the annealed DWCNTs exhibited better emission stability compared with the nonannealed DWCNTs. Such a remarkable improvement of field emission performance was attributed to the enhanced crystallinity and reduced defects of the annealed DWCNTs.

AB - High-purity double-walled carbon nanotubes (DWCNTs) were synthesized by catalytic decomposition of CH4 over Fe-Mo/MgO catalyst at 900 °C. After purification, the DWCNTs were annealed at 1300 °C in vacuum condition of 10-5 Torr. The DWCNTs before and after the high-temperature thermal annealing were characterized using scanning electron microscopy, high-resolution transmission electron microscopy, Raman spectroscopy, and thermogravimetric analysis. It was observed that the annealed DWCNTs had enhanced crystallinity and reduced defects. In addition, the DWCNTs showed better field emission performance after high-temperature thermal annealing. The annealed DWCNTs indicated the turn-on field of about 1.16 V/μm at 0.1 μA/cm2 and the threshold field of about 2.12 V/μm at 1.0 mA/cm2. Moreover, the annealed DWCNTs exhibited better emission stability compared with the nonannealed DWCNTs. Such a remarkable improvement of field emission performance was attributed to the enhanced crystallinity and reduced defects of the annealed DWCNTs.

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Improved crystallinity of double-walled carbon nanotubes after a high-temperature thermal annealing and their enhanced field emission properties

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