• Title, Summary, Keyword: Multi-Wall Carbon Nanotube

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탄소 나노튜브의 나노 모터 응용 해석

  • Lee Jun-Ha
    • Proceedings of the Korean Society Of Semiconductor Equipment Technology
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    • pp.105-108
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    • 2006
  • We investigated the fluidic gas-driven carbon-nanotube motor based on multi-wall carbon nanotubes and fluidic gas flow. Since the origination of the torque was the friction between the carbon nanotube surface and the fluidic gases, the density and the flow rate of the working gas or liquid were very important for the carbon nanotube motor. Molecular simulation results showed that multi-wall carbon nanotubes with very low rotating energy barriers could be effectively used for fluidic gas-driven carbon-nanotube motors.

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Fabrication of a Resonator using suspended Multi-wall Carbon Nanotubes (다중벽 탄소나노튜브를 이용한 공진기 제작)

  • Lee J.H.;Seo H.W.;Song J.W.;Han C.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.465-466
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    • 2006
  • A single-wall carbon nanotube (SWCNT) has been studied as a material of Nano-Eletro-Mechanical-System (NEMS) device together with various nanowires. In order for oscillation of a multi-wall carbon nanotube (MWCNT) or a single-walled carbon nanotube (SWCNT) on plane surface, it needs suspension of a CNT across trench electrodes. So we propose fabrication method of a MWCNT resonator using dielectrophoresis and show successful results of suspeneded MWNT. Thin electrodes with large gaps could not suspend small diameter MWNT but thicker electrodes could. Thin MWNT could be suspended only when the electrode gap was reduced.

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Multi-scale Modeling of Multi wall Carbon Nanotube (다중벽 탄소 나노튜브의 멀티스케일 모델링)

  • Park, Jong-Youn;Cho, Young-Sam;Kim, Sung-Youb;Lee, Young-Min;Jun, Suk-Ky;Im, Se-Young
    • Proceedings of the KSME Conference
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    • pp.542-546
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    • 2004
  • Fully non-local Quasicontinuum method using sub-divided region with Hermite interpolation function is proposed for simulation of carbon nanotube. Tersoff-Brenner potential is adopted for interaction of bonded atoms and also van der Waals force for non-bonded interaction. Bending of single wall carbon nanotube with chirality (20,0) and 15nm length is simulated up to 90 degree. Bending of double wall carbon nanotube with chirality (20,0) and (12,0) is simulated up to 65 degree. Bending of four wall carbon nanotube is simulated up to 45 degree.

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The Length Control of Carbon Nanotube using Electrochemical Etching (전해에칭을 이용한 탄소나노튜브의 길이 제어)

  • 이준석;권순근;곽윤근;김수현
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.6
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    • pp.167-171
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    • 2004
  • In this paper, we proposed a new method to control the length of carbon nanotube using electrochemical etching. We made a nano probe that was composed of the tungsten tip and multi-wall carbon nanotube. The nano probe was placed on the nano stage and the carbon nanotube on the nano probe was etched in the electrolyte solution with the applied voltage. The overall procedures were done under optical microscope and can be monitored. We can obtain a nano probe with proper length through this procedure.

Effect of ultra - violet laser treatment on multi - wall carbon nanotube surface

  • Kim, Jun-Sik;Ahn, Kyoung-Soo;Lee, Chang-Hyo;Kim, Chae-Ok;Hong, Jin-Pyo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.689-691
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    • 2002
  • Well-aligned multi-wall carbon nanotubes (MWCNTs) have been grown on both Coming glass and silicon substrates at about 400 $^{\circ}C$ by a modified plasma - enhanced chemical vapor deposition system. We have investigated laser irradiation effect on carbon nanotube surface by using an ultra - violet laser. The laser operated to modify structural defect of was carbon nanotube and to ablate possible contamination of carbon nanotube surface. The morphology and surface transformation of MWCNTs as analyzed by a SEM. In addition, the field emission measurement was also carried out in a vacuum chamber with a $10^{-7}$ Torr base pressure by applying bias voltages up to 1000V.

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Molecular Dynamics Simulations of Fullerene Nanostructure Fabrications by Atomic Force Microscope Carbon Nanotube tip (원자간력 현미경 탄소 나노튜브 팁을 이용한 플러렌 나노 구조물 제작에 관한 분자동역학 시뮬레이션)

  • 이준하;이홍주
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.8
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    • pp.812-822
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    • 2004
  • This paper shows that carbon nanotubes can be applied to a nanopipette. Nano space in atomic force microscope multi-wall carbon nanotube tips is filled with molecules and atoms with charges and then, the tips can be applied to nanopipette when the encapsulated media flow off under applying electrostatic forces. Since the nano space inside the tips can be refilled, the tips can be permanently used in ideal conditions of no chemical reaction and no mechanical deformation. Molecular dynamics simulations for nanopipette applications demonstrated the possibility of nano-lithography or single-metallofullerene-transistor array fabrication.

Effect of Multi-wall Carbon Nanotube Surface Treatment on the Interface and Thermal Conductivity of Carbon Nanotube-based Composites (다중벽탄소나노튜브 복합재료의 계면 및 열전도도에 표면처리 방법이 미치는 영향)

  • Yoo, Gi-Moon;Lee, Sung-Goo;Kim, Sung-Ryong
    • Journal of Adhesion and Interface
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    • v.11 no.4
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    • pp.174-180
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    • 2010
  • The effect of carbon nanotube surface treatment on the interface and thermal conductivity of carbon nanotube-based poly(methylmethacrylate) (PMMA) composites was investigated. Coagulation and atomic-transfer radical polymerization (ATRP) was applied to modify the surface of multi-wall carbon nano-tube. The composite of ATRP method used carbon nanotube showed the higher transparency and thermal conductivities than that of the coagulation method used. In comparison to the thermal conductivity of pure PMMA, 0.21 W/mK, the ATRP carbon nanotube used PMMA/MWNT composite showed a thermal conductivity of 0.38 W/mK. The interface between carbon nanotube and PMMA was observed by scanning electron microscope and uniform dispersion of carbon nanotube was observed without any void in the PMMA matrix. It may be beneficial to transport the phonon without any scattering and it may result in a higher thermal conductivity.

Percolation threshold and piezoresistive response of multi-wall carbon nanotube/cement composites

  • Nam, I.W.;Souri, H.;Lee, H.K.
    • Smart Structures and Systems
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    • v.18 no.2
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    • pp.217-231
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    • 2016
  • The present work aims to develop piezoresistive sensors of excellent piezoresistive response attributable to change in nanoscale structures of multi-wall carbon nanotube (MWNT) embedded in cement. MWNT was distributed in a cement matrix by means of polymer wrapping method in tandem with the ultrasonication process. DC conductivity of the prepared samples exhibited the electrical percolation behavior and therefore the dispersion method adopted in this study was deemed effective. The integrity of piezoresistive response of the sensors was assessed in terms of stability, the maximum electrical resistance change rate, and sensitivity. A composite sensor with MWNT 0.2 wt.% showed the lowest stability and sensitivity, while the maximum electrical resistance change rate exhibited by this sample was the highest (96 %) among others and even higher than those found in the literature. This observation was presumably attributed by the percolation threshold and the tunneling effect. As a result of the MWNT content (0.2 wt.%) of the sensor being near the percolation threshold (0.25 wt.%), MWNTs were close to each other to trigger tunneling in response of external loading. The sensor with MWNT 0.2 wt.% was able to maintain the repeatable sensing capability while sustaining a vehicular loading on road, demonstrating the feasibility in traffic flow sensing application.

Improvement Field Emission Uniformity in Carbon Nanotube Composite using Zinc Nano-Fillers

  • Jeon, Sung-Yun;Park, Jae-Hong;Lee, Jong-Hak;Shin, Jun-Ho;Park, Sung-Min;Prashant, Alegaonkar;Yoo, Ji-Beom
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.772-774
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    • 2007
  • The improvement in the field emission parameters, luminescent uniformity, degradation rate and half life has been observed for the thin-multi wall carbon nanotube (t-MWCNT) composite, after incorporating the Zn nanoparticles. The Zn nanoparticles $(diameter\;{\sim}\;100\;{\pm}15\;nm)$ has been incorporated to synthesize the Zn-t-MWCNT composite.

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Fabrication of Nano-bridge Using a Suspended Multi-Wall Carbon Nanotube (다중벽 탄소나노튜브를 이용한 나노 브리지 제작)

  • Lee, Jong-Hong;Won, Moon-Cheol;Seo, Hee-Won;Song, Jin-Woo;Han, Chang-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.3
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    • pp.134-139
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    • 2007
  • We report the suspension of individual multi-walled carbon nanotubes (MWNTs) from the bottom substrate using deep trench electrodes that were fabricated using optical lithography. During drying of the solution in dielectrophoretic assembly, the capillary force pulls the MWNT toward the bottom substrate, and it then remains as a deformed structure adhering to the bottom substrate after the solution has dried out. Small-diameter MWNTs cannot be suspended using thin electrodes with large gaps, but large-diameter MWNTs can be suspended using thicker electrodes. We present the statistical experimental results for successful suspension, as well as the feasible conditions for a MWNT suspension based on a theoretical approach.