Publications (7)19.91 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: To investigate emission properties of the photosensitive carbon nanotube emitters using ethanol as developer, a photosensitive carbon nanotube paste was formulated. for patterning of carbon nanotube paste, backside exposure and development process were carried out after screen printing and drying process. Ethanol is not only formed pattern but also removed organic vehicles in the photosensitive carbon nanotube film. The emission properties of patterned carbon nanotube film with and without firing were evaluated.
    SID Symposium Digest of Technical Papers 05/2007; 38(1). DOI:10.1889/1.2785367
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We have studied, for the first time, the field emission from the film, prepared by a spray method, of the finely dispersed black core material, including multi-walled carbon nanotubes (MWNTs), fabricated by arc discharge. We dispersed the black core material by using an ultrasonic processor and found that the dispersed ones were much finer than those observed when treated with a ball mill and normal ultra-sonic bath. By SEM, HRTEM and Raman analyses, the MWNTs were almost not deformed and damaged during ultra-sonication. The field emission current density measured from the film of the dispersed black core material was about 15 mA/cm2 at an applied field of 8 V/μm, which was about 23 times higher than that found by a ball mill. A current density of 1 mA/cm2, which is required basically for flat panel display, has been obtained at 5.3 V/μm. The lifetime test of the dispersed black core material showed that the current density was almost unchanged while the field was applied. Therefore, it is concluded that a black core material fabricated by arc discharge could be used to flat panel displays as field emitters by dispersing with an ultrasonic processor, without further treatment like extraction or purification.
    Carbon 01/2005; 43(5-43):937-943. DOI:10.1016/j.carbon.2004.11.023 · 6.16 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We analyzed the microstructure of double-walled carbon nanotubes (DWNTs) synthesized by chemical vapor deposition (CVD) method and investigated field emission of properties DWNTs screen printed. We fabricated 1-inch triode type CNTs flat lamp.
    Vacuum Nanoelectronics Conference, 2004. IVNC 2004. Technical Digest of the 17th International; 08/2004
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this work, we fabricate 1-in carbon nano tubes (CNTs) flat lamp of diode and triode structure. The CNTs have been directly grown on soda-lime glass substrate by thermal growth method. To know the optimized flat lamp structure, we have simulated the electric field distribution in these structures by the Maxwell simulator. The metal-mesh grid is inserted between an anode and cathode plate for dispersion of emitted electrons and decrease of turn-on voltage, and we investigate the trajectory of emitted electrons in the triode structure. Also, we suggest the direct joint packaging method, which needs no exhausting hole and tube. The CNTs flat lamps are successfully packaged and fully emitted with high brightness. The emission and brightness properties of CNTs are investigated for various conditions.
    Vacuum 05/2004; 74(1):105-111. DOI:10.1016/j.vacuum.2003.12.137 · 1.43 Impact Factor
  • Carbon 01/2004; 42(14):3024–3027. DOI:10.1016/j.carbon.2004.06.034 · 6.16 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We have investigated effects of post-treatment of carbon nanotubes(CNTs) films on field emission characteristics. CNTs films were prepared with Ar plasma treatment of different exposure times. With the Ar plasma treatment, electron emission at low threshold field was observed and higher emission current at 2.9 V/μm was generated, compared to the untreated films. Also the field emission site density of CNTs films was improved by Ar plasma treatment. We show that electrons can be emitted from not only CNT tip but also irradiation-induced defects on CNTs walls.
    SID Symposium Digest of Technical Papers 01/2004; 35(1). DOI:10.1889/1.1830987
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We have developed a new gas-phase synthesis technique to produce carbon nanotubes (CNTs) with a continuous process and at high temperature, by using a thermal plasma jet. A thermal plasma jet was generated by applying a direct current of 100–300 A, using Ar as the plasma gas with a flow rate of ∼6 ksccm. The temperature of the thermal plasma jet was very high (∼104 K) and the velocity was very fast (∼100 m/s). Fe(CO)5 and CO were used as a catalyst precursor and carbon source, respectively. The yield of CNTs was dramatically increased by attaching a helical extension reactor at the end of the plasma nozzle. High purity (∼80%) CNTs were produced with a continuous process by using a thermal plasma jet with helical extension reactor equipment. The number of CNT walls produced was critically affected by the hydrogen gas injected as an auxiliary plasma gas. Without hydrogen gas, single-walled carbon nanotubes whose diameter was about 1 nm were mostly produced while with hydrogen gas double-walled carbon nanotubes (about 4 nm in diameter) were predominantly produced, with small amount of 3- and 4-walled carbon nanotubes.
    Carbon 01/2004; DOI:10.1016/j.carbon.2004.01.073 · 6.16 Impact Factor