• Title, Summary, Keyword: CNT paste

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A Study on the Surface Treatment of CNT Paste Emitter by Ar Ion Irradiation (아르곤 이온빔을 이용한 CNT 페이스트 에미터의 표면처리에 관한 연구)

  • Kwon, Sang-Jik
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.5
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    • pp.456-461
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    • 2007
  • In this study, a surface treatment method using accelerated Ar ions was experimented for exposing the carbon nanotubes (CNT) from the screen-printed CNT paste. After making a cathode electrode on the glass substrate, photo sensitive CNT paste was screen-printed, and then back-side was exposed by UV light. Then, the exposed CNT paste was selectively remained by development. After post-baking, the remained CNT paste was bombarded by accelerated Ar ions for removing some binders and exposing only CNTs. As results, the field emission characteristics were strongly depended on the accelerating energy, bombardment time, and the power of RF plasma ion source. When Ar ions accelerated with 100 eV energy from the 100 W RF plasma source are bombarded on the CNT paste surface for 10 min, the emission level and the uniformity were best.

Effect of Ball Milling on Photosensitive Carbon Nanotube Pastes and Their Field Emission Properties (감광성 CNT paste에 대한 저에너지 Ball Milling 처리 효과)

  • Jang, Eun-Soo;Lee, Han-Sung;Lee, Nae-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.154-154
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    • 2008
  • Although the screen printing technology using photosensitive carbon nanotube (CNT) paste has many advantages such as low cost, simple process, uniform emission, and capability of mass production, the CNT paste needs to be improved further in CNT dispersion, printability, adhesion, electrical conductivity, population of CNT emitters, etc. Ball milling has been frequently employed to prepare the CNT paste as ball milling can mix its ingredients very well and easily cut the long, entangled CNTs. This study carried out a parametric approach to fabricating the CNT paste in terms of low-energy ball milling and a paste composition. Field emission properties of the CNT paste was characterized with CNT dispersion and electrical conductivity which were measured by a UV-Vis spectrophotometer and a 4-point probe method, respectively. Main variables in formulating the CNT paste include a length of milling time, and amounts of CNTs and conductive inorganic fillers. In particular, we varied not only the contents of conductive fillers but also used two different sizes of filler particles of ${\mu}m$ and nm ranges. Among many variations of conductive fillers, the best field emission characteristics occurred at the 5 wt% fillers with the mixing ratio of 3:1 for ${\mu}m$-and nm-sizes. The amount and size of fillers has a great effect on the morphology, processing stability, and field emission characteristics of CNT emitter dots. The addition a small amount of nm-size fillers considerably improved the field emission characteristics of the photosensitive CNT paste.

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A Study of Damage Sensing and Repairing Effect of CNT Nanocomposites (손상감지용 CNT 나노복합재료의 손상 감지능 및 보강효과 연구)

  • Kwon, Dong-Jun;Wang, Zuo-Jia;Choi, Jin-Young;Shin, Pyeong-Su;Park, Joung-Man
    • Composites Research
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    • v.27 no.6
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    • pp.219-224
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    • 2014
  • Nancomposites manufacture has been developed rapidly, because of reinforcing effects of CNT in terms of mechanical, electrical and thermal properties. In this study, 10 wt% CNT paste was fabricated with good dispersion state and easy processability. Damage sensing and reinforcing effect of CNT paste were investigated in nanocomposites. 10 wt% CNT paste exhibited better tensile and flexural properties than those of general 1 wt% CNT nanocomposites. To observe the healing effect of CNT paste, a crack was made artificially with 30wt% CF30wt%/PP composites, and the CNT paste was filled inside the crack. The damage sensing of CNT paste in CF30wt%/PP composites was investigated by electrical resistance measurement and mechanical tests. CNT paste exhibited good reinforcing effect in mechanical properties of CF30wt%/PP composites, and this reinforcing effect was getting better with larger cracks. The reason was because CNT paste had good interfacial adhesion with CF30wt%/PP composites to resist crack propagation. In electrical resistance measurement, there was a jump in electrical resistance signal at the adhesion interface. The jumping signal could be used to predict fracture of CF/PP composites. CNT nanocomposites for damage sensing had crack reducing effect and damage detection using electrical resistance method.

Effect of Photosensitive Carbon Nanotube Paste on Field Emission Properties (감광성 탄소나노튜브 페이스트의 조성과 열처리가 전계방출 특성에 미치는 영향)

  • Oh, Jeong-Seob;Kim, Dae-Jun;Jeong, Jin-Woo;Song, Yoon-Ho;Cho, Young-Rae
    • Korean Journal of Materials Research
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    • v.16 no.9
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    • pp.550-556
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    • 2006
  • Photosensitive carbon nanotube (CNT) pastes are explored to develop a CNT field emitter for field emission display (FED) application. We formulated a photosensitive paste including multi-walled CNTs (MWNTs) for screen printing. The photosensitive CNT paste was synthesized by mixing of MWNTs, inorganic fillers (nano metal), organic vehicle, monomers and photo initiator. The CNT paste films were patterned by using backside exposure technique. The CNTs were strongly fixed on a cathode by formation of carbon residue during firing process. For the CNT emitters, current-voltage(I-V) characteristics and images of field emission were evaluated. The emission properties of CNT emitters are dependent on the paste composition. A turn-on electric field for the CNT field emitters is measured to be 1 V/$\mu$m. Additionally, the effect of heat treatment parameter on field emission properties was discussed. The newly formulated photosensitive CNT paste can be potentially applicable to highly reliable CNT field emitters.

Field Emission Characteristics of Dot-patterned Photosensitive CNT paste

  • Kim, Jin-Hee;Lee, Han-Sung;Jeon, Ji-Hyeon;Goak, Jeung-Choon;Lee, Nae-Sung
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.786-789
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    • 2007
  • Fabrication of dot-patterned carbon nanotube (CNT) emitters with excellent field emission properties using photo-sensitive CNT paste is described. The photosensitive CNT paste showed good photopatternability, which led us to easily form $10-{\mu}m-diameter$ dot arrays. We presented a parametric study on formulating the photo-sensitive paste and their resultant field emission characteristics.

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Fabrication of CNT paste for FED (FED용 CNT paste 제조)

  • Kim, Tae-Hong;Kim, Jong-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.463-464
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    • 2006
  • 광산업 및 디스플레이 산업의 발전에 따라 관련 제품의 핵심 부품 및 소재 개발이 매우 중요하게 대두되고 있다. 전계방출 소자 및 back light가 되는 나노 발광체의 핵심소재중 하나인 CNT paste는 국내외에서 연구가 진행중이다. 본 연구에서는 메탄올속에서 초음파를 이용하여 분산시킨 CNT 분말, 유기 바인더, 용매, glass frit, Ag powder 등을 사용하여 paste를 만들고, TGA(Thermogravimetric Analyzer)와 SEM(Scanning Electron Microscopy) 분석에 의해 제조 공정의 최적화를 실시하였다.

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Improvement of Field Emission Characteristics of Dot-patterned Photo Sensitive CNT Paste (Dot 패턴 된 감광성 CNT 페이스트의 전계방출 특성 향상)

  • Kim, Jin-Hee;Lee, Han-Sung;Jeon, Ji-Hyeon;Goak, Jeung-Choon;Lee, Nae-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.155-156
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    • 2007
  • Fabrication of dot-patterned carbon nanotube (CNT) emitters with excellent field emission properties using photo-sensitive CNT paste is described. The photosensitive CNT paste showed good photo-patternability, which led us to easily form $10-{\mu}m$-diameter dot arrays. We presented a parametric study on formulating the photo-sensitive paste and their resultant field emission characteristics.

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Fabrication and Field Emission Properties of Dot-patterned CNT Emitters using Mechanically Dispersed Photosensitive CNT paste (기계적 분산 처리한 CNT 페이스트의 제조와 Dot 패턴된 에미터의 전계방출 특성)

  • Lee, Han-Sung;Jeon, Ji-Hyeon;Kim, Jin-Hee;Goak, Jeung-Choon;Lee, Nae-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.450-451
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    • 2007
  • Dot-patterned carbon nanotube (CNT) emitters with excellent field emission properties were fabricated using photosensitive CNT paste. We carried out a parametric study on the compositions and the fabrication processes of the paste, in particular, by ball milling CNTs, which were optimized in terms of dot shapes and their field emission characteristics. The ball milling process improved the field emission current of the dot-patterned CNT emitters several times higher than that of the non-milled paste.

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Characterization of Triode-type CNT-FED Fabricated using Photo-sensitive CNT Paste

  • Kwon, Sang-Jik;Chung, Hak-June;Lee, Sang-Heon;Choi, Hyung-Wook;Shin, Young-Hwa;Lee, Dal-Ho;Lee, Jong-Duk
    • Journal of Information Display
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    • v.5 no.4
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    • pp.18-22
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    • 2004
  • A carbon nanotube field emission display (CNT FED) panel with a 2 inch diagonal size was fabricated through screen printing of a prepared photo-sensitive CNT paste and vacuum in-line sealing technology. After surface treatment of the patterned CNT, only the carbon nanotube tips are uniformly exposed on the surface. The diameter of the exposed CNTs are usually about 20nm. The sealing temperature of the panel is around 390 $^{\circ}C$ and the vacuum level is obtained with $1.4{\times}10^{-5}$torr at the sealing. The field emission properties of the diode type CNT FED panel are characterized. Currently, we are in the process of developing a triode type CNT FED with a self-aligned gate-emitter structure.

Fabrication of CNT FEA Self-aligned between Gate and Emitter using Screen Printing Method (스크린 프린팅 방법에 의해 게이트-에미터간 자체정렬된 3극 구조의 CNT FEA 제조)

  • Kwon, Sang-Jik
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.4
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    • pp.367-372
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    • 2006
  • A carbon nanotube field emission display(CNT FED) panel with a 2 inch diagonal size was fabricated using a screen printing of a prepared photo-sensitive CNT paste and vacuum in-line sealing technology. After a surface treatment of the patterned CNT, only the carbon nanotube tips are uniformly exposed on the surface. The diameter of the exposed CNTs are usually about 20 nm. Using the photo-sensitive CNT paste, we have developed a triode type CNT FEA with a self-aligned gate-emitter structure. The turn on voltage was around 100 V which corresponds to according the turn on field of about $40V/{\mu}m$. By the creation of a self-aligned gate-emitter structure, it is expected that the screen printed photo-sensitive CNT paste is promising as a good candidate for the large size field emission display.