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본딩재료의 성분 변화가 탄소나노튜브 캐소드의 전계방출 특성에 미치는 영향
신허영,성명석,김태식,오정섭,정승진,이지언,조영래,Shin Heo-Young,Seong Myeong-Seok,Kim Tae-Sik,Oh Jeong-Seob,Jung Seung-Jin,Lee Ji-Eon,Cho Young-Rae 한국재료학회 2005 한국재료학회지 Vol.15 No.11
The effects of change in the component of bonding materials in carbon nanotube cathode (CNT-cathode) on field enhancement and field emission characteristics were investigated. The field enhancement factor$\beta$ was dependent on the electrical conductivity of the bonding materials. The use of frit glass as a bonding material showed a higher field enhancement factor and better field emission characteristics than an Ag paste. The reason for why the frit glass showed better field emission characteristics can be summarized as follows. First, a frit glass improves the real aspect ratio of CNTs compared to an Ag paste. Second, the number of CNTs in CNT-cathodes is considerably reduced because the CNTs were extensively oxidized during $390^{\circ}C$ heat treatment in air atmosphere in the case of Ag paste.
탄소나노튜브 캐소드에서 본딩재료가 전계강화와 전계방출 특성에 미치는 영향
신허영,김동희,안병건,최우석,정원섭,정우창,조영래 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.6
Carbon nanotube cathodes with a high current density were investigated for use in flat panel displays. The field emission properties of cathodes fabricated by a screen-printing process were characterized in a high-vacuum chamber in the diode mode. The change in composition of the bonding materials comprise of a glass-frit and an Agpaste greatly affected the sheet resistance of the films after a heat treatment at 350℃. A higher volume fraction of insulating glass-frit in the bonding materials resulted in a larger value for the sheet resistance. However, the electric field enhancement factor(β) in the Fowler-Nordheim equation was not greatly affected by the composition changes of the bonding materials. Compared with the field enhancement factor, the current density was increased much more. Based on these findings, we conclude that the higher value of the current density was due to both an increased field enhancement factor and an increased number of carbon nanotubes protruding from the film surface. (Received May 10, 2004)
인쇄용 페이스트의 조성변화가 탄소나노튜브 캐소드의 전계방출 특성에 미치는 영향
최우석,신허영,김동희,안병건,정원섭,이동구,조영래,Choi, Woo-Suk,Shin, Heo-Young,Kim, Dong-Hee,Ahn, Byung-Gun,Chung, Won-Sub,Lee, Dong-Gu,Cho, Young-Rea 한국재료학회 2003 한국재료학회지 Vol.13 No.10
The effects of paste materials on field emission properties in a carbon nanotube(CNT) cathode were investigated for high-efficient field emission displays. The major components in CNT paste for screen printing were a metallic Ag-paste, a dielectric glass-frit and CNT ink. The emission current from the cathode by an electron tunneling effect increased with an increase in the dielectric material fraction in the CNT paste, which is related to an increase of field enhancement factor in Fowler-Nordheim equation. The surface treatment used, after soft baking of the screen-printed CNT films, greatly affected the decrease in the turn-on field in CNT cathode and the uniformity of emission sites over the entire CNT film area.
탄소나노튜브의 분산이 탄소나노튜브 캐소드의 전계방출 특성에 미치는 영향
안병건,성명석,신허영,김동희,김태식,조영래,Ahn B. G.,Seung M. S.,Shin H. Y.,Kim D. H.,Kim T. S.,Cho Y. R. 한국재료학회 2004 한국재료학회지 Vol.14 No.11
The uniformity of emission mage and field emission properties of carbon nanotube(CNT) cathodes dependence on CNT particle dispersion were investigated for field emission displays. We used multi-walled carbon nanotubes (MWNTs) synthesized by CVD method as the field emitter materials. CNT dispersion in CNT ink was carried out by ultrasonication and shaking methods. According to CNT dispersion conditions, the uniformity of emission image and field emission properties of CNT cathodes were greatly affected. The smaller particles of filler materials and CNT powders provide the better properties of the CNT cathodes.