• Title/Summary/Keyword: Single walled carbon nanotube

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Effect of the top coating surface tension and thermal expansion matching on the electrical properties of single-walled carbon nanotube network films (표면장력과 열팽창계수 불일치가 단일벽 탄소나노튜브 필름의 전도성에 미치는 영향 연구)

  • Kim, Jun-Suk;Han, Joong-Tark;Jeong, Hae-Deuk;Jeong, Hee-Jin;Jeong, Seung-Yol;Lee, Geon-Woong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.03b
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    • pp.42-42
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    • 2010
  • We have characterized the previously undescribed parameters for engineering the electrical properties of single-walled carbon nanotube (SWCNT) films for technological applications. The surface tension of the top coating passivation material and matching coefficients of thermal expansion for the substrate and carbon nanotube network are two crucial parameters for the fabrication of reliable and highly conductive single-walled carbon nanotube network thin films.

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Effect of the top coating surface tension and thermal expansion matching on the electrical properties of single-walled carbon nanotube network films (표면장력과 열팽창계수 불일치가 단일벽 탄소나노튜브 필름의 전도성에 미치는 영향 연구)

  • Kim, Jun-Suk;Han, Joong-Tark;Jeong, Hee-Jin;Jeong, Seung-Yol;Lee, Geon-Woong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.278-278
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    • 2010
  • We have characterized the previously undescribed parameters for engineering the electrical properties of single-walled carbon nanotube (SWCNT) films for technological applications. The surface tension of the top coating passivation material and matching coefficients of thermal expansion for the substrate and carbon nanotube network are two crucial parameters for the fabrication of reliable and highly conductive single-walled carbon nanotube network thin films.

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Electrospray Deposition and Characterization of Single-Walled Carbon Nanotube Thin Films

  • Sundharam, Sridharan;Choi, Kyung-Hyun
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2011.05a
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    • pp.40.1-40.1
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    • 2011
  • Single-walled carbon nanotubes are one among the most promising carbonaceous materials to be used as the electrodes in the devices like micro batteries, supercapacitors, etc. In this study, single-walled carbon nanotube thin films have been fabricated through electrospray deposition technique which is one of the attractive direct printing methods in the field of printed electronics. Single-walled carbon nanotube ink (water dispersed, 3wt %) has been used to fabricate thin films through electrospray deposition technique. The as-deposited SWCNT thin films have been characterized using the appropriate characterization techniques and the results are presented.

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The Fabrication of A Semi-conducting Single-walled Carbon Nanotube Device Using A Burning Technique (연소 기술을 이용한 반도체성 단일벽 탄소 나노튜브 장치 제작)

  • 이형우;한창수;김수현;곽윤근
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.881-885
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    • 2004
  • We report a method for making a device on which semi-conducting single-walled carbon nanotubes are attached selectively between two metal electrodes. This method is divided two processes. First we can connect a rope of single-walled carbon nanotubes(SWNTs) between two electrodes using the electric field. But a SWNTs' rope obtained by the first process was composed of a few of metallic and semi-conducting SWNTs together. The second process is to burn the metallic and semi-conducting nanotubes through applying a voltage. As a result, we can obtain a semi-conducting SWNT device. To make the patterned electrodes, we deposited $SiO_2$(150nm) on a wafer. After then, we made a patterned samples with Ti(200 $\AA$)/Au(300$\AA$). We empirically obtained a electric condition 0.66 $V_{pp}$ /${\mu}{\textrm}{m}$@5MHz. From this result, we verified that most of current go through the metallic nanotubes in this device. When we apply DC voltage between two electrodes, the metallic carbon nanotubes are burnt. Finally, we can obtain a semi-conducting nanotube device which we desire to make. We got the I-V characteristic graph which has shown the semi-conducting property. We hope to apply to the various applications using this selective semi-conducting carbon nanotube deposition method.ethod.

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Tension Control Tunable Carbon Nanotube Resonator (장력제어를 통한 가변형 탄소나노튜브 공진기에 대한 연구)

  • Choi, Tae Ho;Lee, Jun Ha
    • Journal of the Semiconductor & Display Technology
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    • v.12 no.2
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    • pp.63-66
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    • 2013
  • Carbon Nanotube have been proposed for use in various applications for electromechanical systems. Nano-electromechanical resonators which provide high frequency resolution and long energy storage time, play an important role in wide area fields of science and engineering. Using the control of tension in carbon nanotube, can be made the tunable resonator. In the study, we analysis the tunable frequency change of resonator by tension changes due to the rotation angles of the single-walled carbon nanotube resonator. The frequency characteristics of a resonator as a function of the rotation angle. The tension was found to decrease with increasing rotation angle, and therefore the resonance frequencies could be changed by controlling the single-walled carbon nanotube rotation angle. The resonance frequencies decreased with increasing angle, and when the rotation angle was greater than $60^{\circ}$, these changes were marked.

Supercapacitors using Pure Single-walled Carbon Nanotubes

  • Tanaike, Osamu;Futaba, Don N.;Hata, Kenji;Hatori, Hiroaki
    • Carbon letters
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    • v.10 no.2
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    • pp.90-93
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    • 2009
  • The excellent and characteristic capacitor performance of pure single-walled carbon nanotubes (SWNTs), which differ from conventional activated carbon electrodes, is reported. SWNTs with little bundling showed higher specific capacitance than activated carbons. High operating voltage can be expected for pure SWNTs without metal contamination and graphene edge structure.

Possible application of single-walled carbon nanotube transistors for humidity sensor (단겹 탄소나노튜브 트랜지스터의 나노습도센서 응용가능성 연구)

  • Na, Pil-Sun;Kim, Hyo-Jin;Lee, Young-Hwa;Lee, Jeong-O;Kim, Jin-Hee
    • Journal of Sensor Science and Technology
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    • v.14 no.5
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    • pp.331-336
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    • 2005
  • The influence of water molecule on the electrical properties of single-walled carbon nanotube field effect transistors (SWNT-FETs) was reported. Conductance suppression was observed with the increase of the humidity. This can be explained by doping of the SWNT-FETs, which has p-type semiconductor characteristic, with the water molecules acting as an electron donor. However, after 65 % of humidity, conductance of the SWNT-FETs started to increase again, due to the opening of electron channels. Upon annealing at $400^{\circ}C$ in Ar atmosphere, conductance increases more than 500 %, and the threshold voltage shifts toward further positive gate voltages. The results of this experiment support possible application of single-walled carbon nanotubes for humidity sensing material.