• 제목/요약/키워드: Carbon Nanotube(CNT)

검색결과 749건 처리시간 0.029초

The effect of pore structure and surface properties of carbon nanotube films on the performance of a lithium sulfur battery

  • Song, Hyeonjun;Hwang, Yunjae;Kumar, Vimal Tiwari;Jeong, Youngjin
    • Carbon letters
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    • 제27권
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    • pp.12-17
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    • 2018
  • We fabricated a Li-S battery with post-treated carbon nanotube (CNT) films which offered better support for sulfur, and investigated the effect of the surface properties and pore structure of the post-treated CNT films on Li-S battery performance. Post-treatments, i.e., acid treatment, unzip process and cetyltrimethylammonium bromide (CTAB) treatment, effectively modified the surface properties and pore structure of the CNT film. The modified pore structure impacted the ability of the CNT films to accommodate the catholyte, resulting in an increase in initial discharge capacity.

Electrokinetic deposition of individual carbon nanotube onto an electrode gap

  • Han Chang-Soo;Seo Hee-Won;Lee Hyung-Woo;Kim Soo-Hyun;Kwak Yoon-Keun
    • International Journal of Precision Engineering and Manufacturing
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    • 제7권1호
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    • pp.42-46
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    • 2006
  • This paper presents a method for deposition an individual carbon nanotube (CNT). The alignment of a single CNT is very useful to perform studies related to applications in FET (Field Emitted Transistor), SET (Single Electron Transistor) and to make chemical sensor as well as bio sensors. In this study, we developed the deposition method of a CNT individualized in a solution. Using the electrokinetic method, we found the optimum conditions to assemble the nanotube and discussed about plausible explanation for the assembling mechanism. These results will be available to use for making the CNT sensor device.

Carbon Nanotube 와 Boron Nitride Nanotube 의 핵자기공명 (Nuclear Magnetic Resonance of Carbon Nanotube and Boron Nitride Nanotube)

  • 정재갑;유권상;남승훈;이규층;이무희;이영희
    • 한국정밀공학회지
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    • 제21권6호
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    • pp.22-27
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    • 2004
  • 특성에 대한 많은 연구가 진행되었고, 새로운 나노 소자로서의 가능성을 보여왔다. CNT의 전기적 성질은 직경과 chirality 의 함수로서 금속 혹은 반도체 성질을 주기적으로 가지며, 이론적 연구에 의하면 단일구역의 CNT 는 1/3 이 금속성, 나머지는 밴드갭이 수 ㎷ 로 아주 작고, 나노튜브의 직경에 반비례하는 반도체 성질을 나타낸다.(중략)

기가헤르츠 오실레이터를 위한 BN 나노튜브 연구 (A study on a Boron-Nitride Nanotube as a Gigahertz Oscillator)

  • 이준하
    • 반도체디스플레이기술학회지
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    • 제6권1호
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    • pp.27-30
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    • 2007
  • The gigahertz oscillator behavior of double-walled boron-nitride nanotube (BNNT) was investigated by using classical molecular dynamics simulations. The BNNT oscillator characteristics were compared to carbon-nanotube (CNT) and hybrid-C@BNNT oscillators. The results show that the BNNT oscillators are higher than the van der Waals force of the CNT oscillator. Since the frictional effects of BNNT oscillators are higher than that of a CNT oscillator, the damping factors of BNNT and hybrid oscillators are higher than that of a CNT oscillator.

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정전기력 가진에 의한 외팔보형 탄소나노튜브 공진기의 비선형 동적 응답 (Nonlinear Dynamic Response of Cantilevered Carbon Nanotube Resonator by Electrostatic Excitation)

  • 김일광;이수일
    • 한국소음진동공학회논문집
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    • 제21권9호
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    • pp.813-819
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    • 2011
  • This paper predicted nonlinear dynamic responses of a cantilevered carbon nanotube(CNT) resonator incorporating the electrostatic forces and van der Waals interactions between the CNT cantilever and ground plane. The structural model of CNT includes geometric and inertial nonlinearities to investigate various phenomena of nonlinear responses of the CNT due to the electrostatic excitation. In order to solve this problem, we used Galerkin's approximation and the numerical integration techniques. As a result, the CNT nano-resonator shows the softening effect through saddle-node bifurcation near primary resonance frequency with increasing the applied AC and DC voltages. Also we can predict nonlinear secondary resonances such as superharmonic and subharmonic resonances. The superharmonic resonance of the nano-resonator is influenced by applied AC voltage. The period-doubling bifurcation leads to the subharmonic resonance which occurs when the nano-resonator is actuated by electrostatic forces as parametric excitation.

수소 및 산소 플라즈마 처리에 따른 탄소나노튜브의 구조적 특성 변화 (Influence of Hydrogen and Oxygen Plasma Treatment on the Structural Properties of Carbon Nanotubes)

  • 이재형;나창운;박대희
    • 한국전기전자재료학회논문지
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    • 제20권11호
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    • pp.943-947
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    • 2007
  • The effect of hydrogen and oxygen plasma treatments on the structural properties of carbon nanotube(CNT) has been systematically investigated. As the plasma power was increased, nano particles were appeared at the surface of CNTs. At high plasma power(300 Watt), the structure of CNT was changed from nanotube type to nano particles. However, in case of hydrogen plasma treatment, there was no change in microstructure of CNT. From the Raman analysis, the crystallinity of CNT was deteriorated by the plasma treatment, regardless of gas types.

탄소나노튜브 가용체 초소형 퓨즈의 한계 전류 특성 (Limited Current Characteristics of Carbon Nanotube Elements Miniature Fuses)

  • 노성여;진상준;이선우
    • 한국전기전자재료학회논문지
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    • 제33권1호
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    • pp.45-49
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    • 2020
  • In this paper, we prepared miniature fuse fabricated with carbon nanotube (CNT) fiber for the use of low rated current under 1 A and high speed operation under 4ms. CNT fuses were fabricated in the form of universal modular fuse (UMF) with different diameter of CNT fibers defined by multiplying the CNT threads. Electrical properties of the CNT fuses were measured such as resistance, rated current, and operation time with current. Resistance of the CNT fuse decreased and rated current increased with the diameter of the CNT fuses, respectively. Consequently, the operation time with current increased with the diameter of the CNT fuses. The CNT fuses fabricated in this work had broad range of low rated current from 0.05 to 1.25 A by multiplying the CNT threads. Operation time was measured about 3.6ms which was applicable to the UMF.

Arbitrary Cutting of a single CNT tip in Nanogripper using Electrochemical Etching

  • Lee Junsok;Kwak Yoonkeun;Kim Soohyun
    • International Journal of Precision Engineering and Manufacturing
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    • 제6권2호
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    • pp.46-49
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    • 2005
  • Recently, many research results have been reported about nano-tip using carbon nanotube because of its better sensing ability compared to a conventional silicon tip. However, it is very difficult to identify the carbon nanotube having proper length for nano-tip and to attach it on a conventional tip. In this paper, a new method is proposed to make a nano-tip and to control its length. The electrochemical etching method was used to control the length by cutting the carbon nanotube of arbitrary length and it was possible to monitor the process through current measurement. The etched volume of carbon nanotube was determined by the amount of applied charge. The carbon nanotube was successfully cut and could be used in the nanogripper.

RF Plasma CVD법에 의해 증착된 카본나노튜브(CNT)의 특성에 대한 기판 온도의 영향 (The Effects of Substrate Temperature on Properties of Carbon Nanotube Films Deposited by RF Plasma CVD)

  • 김동선
    • Korean Chemical Engineering Research
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    • 제46권1호
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    • pp.50-55
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    • 2008
  • RF plasma CVD법을 이용하여 금속 촉매(Fe)가 증착된 $SiO_2$ 기판 위에 $H_2$$C_2H_2$의 혼합가스를 사용하여 증착된 탄소나노튜브(carbon nanotube, CNT)의 특성에 대한 기판의 온도의 영향을 조사하였다. $SiO_2$ 위에 철 촉매는 RF 마그네트론 스퍼터에 의해 만들어졌다. 고 순도의 나노튜브 박막을 얻기 위해서 기판 홀더 위에 접지된 그리드 메쉬 커버를 설치하였다. 증착된 CNT의 표면 미세구조 및 화학적 구조를 SEM, Raman, XPS, 그리고 TEM으로 측정하였다. 증착된 CNT 박막들은 대나무 같은 다중벽 구조를 가지는 탄소 파이버 형태였으며 $55^{\circ}C$에서 보다 $600^{\circ}C$에서 보다 더 치밀한 구조를 보이나 $650^{\circ}C$에서는 밀도가 다소 감소함을 알 수 있었다.

나노 트위져의 구동 전압에 관한 연구 (A Study on the Actuating Voltage of a Nanotweezer)

  • 이준석;최재성;강경수;곽윤근;김수현
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 추계학술대회
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    • pp.986-990
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    • 2004
  • In this paper, we propose a method to estimate the actuating voltage of the nanotweezer made by manual assembly using carbon nanotube. The nanotweezer is composed of two CNT arms that are made by the multiwalled carbon nanotube and tungsten tip. Since the each CNT arm has the macro actuator, the nanotweezer can manipulate a large particle and it is possible to close and open the CNT arm repeatedly. The closing voltage, i.e., actuating voltage is calculated using the capacitance between the carbon nanotubes in CNT arm. We demonstrate the actuation of the nanotweezer using the voltage calculated with the electrostatic force.

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