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Electron Emission from Robust CNTs Grown by Resist-Assisted Patterning
박규창,이창석,류재황,임한얼,민경우,정일옥,S. Manivannan,장진,김기서 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We developed novel carbon-nanotube field-emitter arrays (CNT-FEAs) with a resist-assisted patterning process using dc-plasma enhanced chemical vapor deposition (PECVD). Through this method, we obtained a CNT very strongly bonded to the substrate. The CNTs were grown at -600 V bias to the substrate electrode and a +300 V bias to the mesh grid, being placed 10 mm above the substrate holder electrode. The structure and the electrical properties of the CNTs were strongly related to the growth time. The length was decreased after 80-minute and the diameter increased with the growth time. The electron emission current increased with growth time. The growth mechanism, the electron emission characteristics and the mechanical robustness are discussed. We developed novel carbon-nanotube field-emitter arrays (CNT-FEAs) with a resist-assisted patterning process using dc-plasma enhanced chemical vapor deposition (PECVD). Through this method, we obtained a CNT very strongly bonded to the substrate. The CNTs were grown at -600 V bias to the substrate electrode and a +300 V bias to the mesh grid, being placed 10 mm above the substrate holder electrode. The structure and the electrical properties of the CNTs were strongly related to the growth time. The length was decreased after 80-minute and the diameter increased with the growth time. The electron emission current increased with growth time. The growth mechanism, the electron emission characteristics and the mechanical robustness are discussed.
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Purification and Preparation of Single-Walled Carbon Nanotube Films
박규창,S. Manivannan,정일옥,류재황,이창석,장진,김기서 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We describe a simple process for the removal of metal catalysts and the dispersion of single-walled carbon nanotubes (SWNTs) in aqueous and organic solvents without damaging the structure of the nanotubes. The metal catalyst was removed by using a sodium hydroxide (NaOH) - ethyl alcohol (EtOH) solution. Dispersion of purified nanotubes was accomplished by using a polymer wrapping functionalization. Raman and scanning electron microscope analyses were performed to confirm the purity and the dispersion of the treated tubes. The bundle size of the dispersed SWNTs was elucidated using the atomic force microscopy technique and the size was measured as 2 - 5 nm. Transparent and conducting carbon nanotube films were prepared on glass substrates by using a spin-coating method. Optical transmission and sheet resistance measurements showed that the randomly-oriented, dispersed nanotubes film had an average sheet resistance of 974 Ω/□ and a at optical transmission of ∽77 % at 600 nm. In this simple and scalable process, the sheet resistance and the optical transmission of the film were controlled by using the number of coatings and the concentration of the solution. We describe a simple process for the removal of metal catalysts and the dispersion of single-walled carbon nanotubes (SWNTs) in aqueous and organic solvents without damaging the structure of the nanotubes. The metal catalyst was removed by using a sodium hydroxide (NaOH) - ethyl alcohol (EtOH) solution. Dispersion of purified nanotubes was accomplished by using a polymer wrapping functionalization. Raman and scanning electron microscope analyses were performed to confirm the purity and the dispersion of the treated tubes. The bundle size of the dispersed SWNTs was elucidated using the atomic force microscopy technique and the size was measured as 2 - 5 nm. Transparent and conducting carbon nanotube films were prepared on glass substrates by using a spin-coating method. Optical transmission and sheet resistance measurements showed that the randomly-oriented, dispersed nanotubes film had an average sheet resistance of 974 Ω/□ and a at optical transmission of ∽77 % at 600 nm. In this simple and scalable process, the sheet resistance and the optical transmission of the film were controlled by using the number of coatings and the concentration of the solution.
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