• 제목/요약/키워드: carbon nanotube(CNT)

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Electron Emission Properties of CNT Arrays Grown with MIcro Molding In Capillary (MIMIC) Assisted Process

  • Lim, Han-Eol;Ryu, Je-Hwang;Lim, Joon-Won;Son, Byoung-Taek;Lee, Yi-Sang;Jang, Jin;Park, Kyu-Chang
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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    • pp.1535-1538
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    • 2008
  • Carbon nanotube arrays were fabricated using micro molding in capillary (MIMIC) process. Patterns remained on the surface in the pattern complementary to that present in the mold. CNTs were selectively grown on the MIMIC patterned sites with a triode PECVD. And turn on field for $10\;{\mu}A/cm^2$ electron emission current was $2.2\;V/{\mu}m$ turn on field.

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Size dependent effect on deflection and buckling analyses of porous nanocomposite plate based on nonlocal strain gradient theory

  • Khazaei, Pegah;Mohammadimehr, Mehdi
    • Structural Engineering and Mechanics
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    • 제76권1호
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    • pp.27-56
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    • 2020
  • In this paper, the deflection and buckling analyses of porous nano-composite piezoelectric plate reinforced by carbon nanotube (CNT) are studied. The equations of equilibrium using energy method are derived from principle of minimum total potential energy. In the research, the non-local strain gradient theory is employed to consider size dependent effect for porous nanocomposite piezoelectric plate. The effects of material length scale parameter, Eringen's nonlocal parameter, porosity coefficient and aspect ratio on the deflection and critical buckling load are investigated. The results indicate that the effect of porosity coefficient on the increase of the deflection and critical buckling load is greatly higher than the other parameters effect, and size effect including nonlocal parameter and the material length scale parameter have a lower effect on the deflection increase with respect to the porosity coefficient, respectively and vice versa for critical buckling load. Porous nanocomposites are used in various engineering fields such as aerospace, medical industries and water refinery.

띠 모양의 에미터를 가지는 탄소나노튜브 삼전극 전계방출 디스플레이 소자의 시뮬레이션 (Simulation of the Strip Type CNT Field Emitter Triode Structure)

  • 류성룡;이태동;김영길;변창우;박종원;고성우;천현태;고남제
    • 한국전기전자재료학회논문지
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    • 제16권11호
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    • pp.1023-1028
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    • 2003
  • The field emission characteristics are studied by simulation for carbon nanotube triode structures with a strip-shaped emitter and a gate hole aligned with it. Two structures, one with double-edge and the other with single edge are analyzed. They show good emission characteristics. Emissions of electrons are concentrated on the edges of emitter and the emitted current increases as the distance between emitter and gate decreases. For single-edged emitter, the emitted electrons form a narow strip-shaped beam which has a good directionality. These triode structures have advantages in that they can be easily fabricated and aligned for assembly.

Effect of Fe3O4 loading on the conductivities of carbon nanotube/chitosan composite films

  • Marroquin, Jason;Kim, H.J.;Jung, Dong-Ho;Rhee, Kyong-Yop
    • Carbon letters
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    • 제13권2호
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    • pp.126-129
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    • 2012
  • Nanocomposite films were made by a simple solution casting method in which multi-walled carbon nanotubes (MWCNT) and magnetite nanoparticles ($Fe_3O_4$) were used as dopant materials to enhance the electrical conductivity of chitosan nanocomposite films. The films contained fixed CNT concentrations (5, 8, and 10 wt%) and varying $Fe_3O_4$ content. It was determined that a 1:1 ratio of CNT to $Fe_3O_4$ provided optimal conductivity according to dopant material loading. X-ray diffraction patterns for the nanocomposite films, were determined to investigate their chemical and phase composition, revealed that nanoparticle agglomeration occurred at high $Fe_3O_4$ loadings, which hindered the synergistic effect of the doping materials on the conductivity of the films.

실리콘 유무기 하이브리드 코팅을 이용한 CNT 투명전도필름의 내구성 증진에 관한 연구

  • 하인호;신권우;한종훈;서문석;김선민;조진우;이철승
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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    • pp.414-414
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    • 2012
  • 차세대 플렉시블 디스플레이 소재로서, 탄소나노뷰브(CNT) 기반의 투명전도막은 기존의 ITO 박막보다 우수한 유연성을 갖기 때문에 많은 관심을 모으고 있다. 특히 낮은 저항과 투과도를 유지하면서 투명 전도막의 내구성을 향상시키는 연구는 상업화에 가장 필요한 연구 분야이다. 본 연구에서는 다층벽 탄소나노튜브(MWCNT)를 이용하여 제작된 투명 전도막의 내구성을 개선하기 위하여 오버 코팅을 통한 물성 개선을 연구하였다. 투명전도막은 PET기판 위에 스프레이 방식을 이용하여 균일하게 코팅하였다. 오버 코팅 물질로는 실리콘계 유무기하이브리드 투명하드 코팅을 적용하였다. 연구결과 오버 코팅층과 CNT 코팅층과의 젖음성이 물성 향상에 가장 많은 영향을 끼치는 것을 관찰하였고, 특히 젖음성이 증가할수록 투과도와 전기전도도가 향상되는 것을 확인하였다. 또한 고온 고습 환경에서 240시간 이상 내구성 테스트 결과, 저항률 변화가 1.1 이하인 것을 확인하였다.

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Active-Matrix Field Emission Display Based on CNT Emitter and a-Si TFT

  • Song, Yoon-Ho;Kim, Kwang-Bok;Hwang, Chi-Sun;Lee, Sun-Hee;Park, Dong-Jin;Lee, Jin-Ho;Kang, Kwang-Yong;Hur, Ji-Ho;Jang, Jin
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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    • pp.923-926
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    • 2004
  • Active-matrix field emission display (AMFED) based on carbon nanotube (CNT) emitter and amorphous silicon thin-film transistor (a-Si TFT) is reviewed. The AMFED pixels consisted of a high-voltage a-Si TFT and mesh-gated CNT emitters. The developed AMFED panel showed a high performance with a driving voltage of below 15 V. The low-cost and large-area AMFED approach with a metal mesh technology will be discussed.

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Facile Synthesis, Characterization and Photocatalytic Activity of MWCNT-Supported Metal Sulfide Composites under Visible Light Irradiation

  • Zhu, Lei;Meng, Ze-Da;Oh, Won-Chun
    • 한국세라믹학회지
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    • 제49권2호
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    • pp.155-160
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    • 2012
  • This paper reported a simple deposition-precipitation method, introducing the metal (Ni, Ag and Sn) and $Na_2S{\cdot}5H_2O$ to preparedispersion metal sulfide nanoparticles on the surface of the Multi-walled carbon nanotube for synthesis of CNT-$M_xS_y$ ($NiS_2$, $Ag_2S$, SnS) composite photocatalysts. The characterization of the prepared CNT-$M_xS_y$ ($NiS_2$, $Ag_2S$, SnS) composites was performed by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis and BET analysis. Furthermore, the MB degradation rate constant for CNT-SnS composite was $5.68{\times}10^{-3}$ under visible light irradiation, which was much higher than the corresponding values for other samples. The detailed formation and photocatalytic mechanism are also provided here.

Preliminary Study on Field Emitter Array Cathodes for Electrodymanic Tether Propulsion

  • Kitamura, Shoji;Nishida, Shin'ichiro;Iseki, Yasushi;Okawa, Yasushi
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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    • pp.300-305
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    • 2004
  • A preliminary study on. field emitter array cathodes was conducted aiming at applying for electrodymanic tether (EDT) propulsion systems. The EDT propulsion systems are assumed to use for active removal systems of post-mission spacecraft, which would otherwise become space debris. A survey on field emit-ter array cathode technology was conducted, and it showed that carbon nanotube (CNT) emitters are suit-able to EDT application. Trial fabrications and evaluation tests of CNT emitters were conducted, which demonstrated a target emission current density of 10 ㎃/$\textrm{cm}^2$. It was found out that the most important technical issue for developing CNT emitters is to improve the performance against voltage breakdown between the emitter and the opposite electrode.

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기가헤르쯔급 탄소 나노튜브 진동자의 분자동역학 시뮬레이션 (A Study of Gigahertz Nanotube Actuator using Molecular Dynamic Simulation)

  • 이준하;이흥주
    • 한국산학기술학회논문지
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    • 제7권2호
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    • pp.163-167
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    • 2006
  • 본 논문은 금속 이온에 둘러싸인 다중벽 탄소 나노튜브를 이용한 기가급 진동자의 응용 가능성에 대한 해석을 수행하였다. 탄소 나노튜브 오실레이터 안쪽에 포함된 칼슘 이온들은 외부에서 공급된 전계에 의해 가속될 수 있고 $nK^{+}(a)CNT$ 오실레이터로 구성된 기가 헤르쯔 진동자는 본 연구의 분자동역학 시뮬레이션에서 공급된 전계에 의해 초기화될 수 있었다.

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낮은 물-바인더 비를 갖는 시멘트 복합체의 CNT 첨가량에 따른 수화특성 및 발열특성 (Investigation of the Effects of CNT Dosages on the Hydration and Heating Properties of Cement Composites with Low Water-to-binder Ratio)

  • 오성우;정상화;정원석;최영철
    • 한국구조물진단유지관리공학회 논문집
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    • 제22권6호
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    • pp.182-188
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    • 2018
  • 최근 우수한 전기전도도와 넓은 비표면적을 갖는 탄소나노튜브(CNT)를 활용하여 고강도 및 고내구성 콘크리트의 생산을 위한 연구가 많은 연구자들에 의하여 활발히 이루어지고 있다. CNT의 혼입을 통한 콘크리트의 고강도에 대한 연구가 주를 이루고 있으나, 그 외의 연구는 미흡한 실정이다. 이에, 본 연구에서는 CNT 첨가량에 대한 시멘트 복합체의 역학성능 및 발열성능에 대한 평가를 실시하였다. 낮은 물-바인더 비를 기반으로 하는 시멘트-플라이애시 배합에 대하여, 바인더 중량대비 0.2% 및 0.5%의 CNT 첨가에 따른 재령별 압축강도, 수화특성분석을 위한 미소수화열 분석, 페이스트 내 CNT의 분산 및 주변 수화물과의 관계를 규명하기 위한 SEM분석, 기준전극 삽입을 통한 발열실험 및 열 중량 분석을 실시하였다. CNT 첨가량의 증가에 따라 발열성능은 증가하며, CNT가 첨가되지 않은 기준 배합 CNT가 첨가된 배합의 경우 동등수준의 역학성능을 갖는 것으로 나타났다.