• Title/Summary/Keyword: conductive carbon

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Influence of Carbon Black-embed Carbon Nanotubes on Electrochemical Performance of Activated Carbon-based Electrodes (활성탄소 전극의 전기화학적 특성에 대한 카본블랙 함입된 탄소나노튜브의 효과)

  • Kim, Ki-Seok;Park, Soo-Jin
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.133.1-133.1
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    • 2010
  • In this work, carbon black(CBs)-embed multi-walled carbon nanotubes (MWNTs) as conductive fillers for activated carbon(ACs)-based electrodes for supercapacitor were prepared by chemical reduction of oxidized MWNTs and CBs. The effect of CBs-MWNT composites on electrochemical performances of ACs-based electrodes were investigated as a function of CB-MWNT ratio. It was found that CBs-MWNTs composites were formed by the reduction reaction of the functional groups of oxidized MWNTs and CBs. It was resulted in the conjugation of CBs onto the MWNT having high surface area and aspect ratio, leading to the enhanced electrical properties of MWNTs. The electrochemical performances, such as current density, charge-discharge, and specific capacitance of the ACs/CBs-MWNT electrodes were higher than that of ACs/MWNTs and conventional ACs/CB electrodes, which was attributed to the synergistic effect of CBs-MWNTs as a conductive filler.

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Patch-type large strain sensor using elastomeric composite filled with carbon nanofibers

  • Yasuoka, Tetsuo;Shimamura, Yoshinobu;Todoroki, Akira
    • International Journal of Aeronautical and Space Sciences
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    • v.14 no.2
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    • pp.146-151
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    • 2013
  • Carbon nanofibers (CNFs) are electrically conductive. When CNFs are used as fillers in resin, this electrical conductivity can be yielded without adversely affecting the mechanical properties of the resin. When an elastomer is adopted as the resin, a conductive elastomer can then be produced. Due to its flexibility and conductive properties, a large strain sensor based on changes in resistivity may be produced, for strain sensing in flexible structures. In this study, a patch-type large strain sensor using resistivity change in a CNF/elastomer composite was proposed. The measurement limits of the sensor were investigated experimentally, and the limit was found to be 40%, which greatly exceeded the limits of conventional metal-foiled strain gages. Also, the proposed CNF/elastomer large strain sensor can be used to measure flexible materials, while conventional strain gages cannot be used to measure such strains.

Evaluation of DC Resistive Humidity Sensors Based on Conductive Carbon Ink (전도성 카본 잉크를 이용한 직류 저항형 습도센서 제작 및 평가)

  • An, Taechang
    • Journal of Sensor Science and Technology
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    • v.26 no.6
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    • pp.397-401
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    • 2017
  • A DC resistance type humidity sensor using conductive carbon ink was fabricated and its performance was evaluated. The humidity sensor was fabricated using a screen printing technique and have a structure that does not require additional metal electrodes to measure resistance change. To evaluate the performance of the humidity sensor, we measured the DC resistance change under various relative humidity levels. The fabricated humidity sensor showed a resistance change of about $2.5{\sim}50k{\Omega}$ in 11 ~ 95% RH environment. It also shows a linear relationship in the relative humidity versus log DC resistance graph. In comparison with commercial humidity sensor under real environment, it can be confirmed that the resistance of the humidity sensor changes to almost the same level as the measured humidity. These results show that the resistance type humidity sensor can be operated stably in actual environment.

Carbon nanotube transparent conductive film: current status and prospect

  • Han, Chang-Soo;Oh, Sang-Keun
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.474-475
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    • 2009
  • As a substitute of ITO material, carbon nanotube (CNT) is widely studied for transparent conductive film (TCF). Current sheet resistance of CNT-TCF is about 100 ${\Omega}$/sq at 80% transmittance. But CNT-TCF performance in manufacturable level is about 500 ${\Omega}$/sq at 83% based on the Topnanosys Co's result. Therefore, critical issue in CNT-TCF research is to reduce the sheet resistance with manufacturing reliability. In this report, recent developments using CNT-TCF are introduced. Touch panel, transparent LED signboard, transparent speaker and transparent heater are representative examples. Also I describe the future issues and prospect of CNT-TCF for the flexible display.

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Enhanced Carbon Nanotube Dissolution for Electrically Conductive Films (전기전도성 필름제조를 위한 탄소나노튜브 용해도 향상)

  • Lee, Geon-Woong;Han, Dong-Hee;Park, Su-Dong;Kang, Dong-Pil;Kumar, Satish
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.65-66
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    • 2006
  • Solubility of single wall carbon nanotubes (SWNTs) has been determined in various dispersing media by using the solvent parameters such as Kamlet-Taft parameter and 3-dimensional parameters. Nitric acid-treated SWNTs exhibit significantly improved solubility in hydrogen bondable solvents as well as in solvent mixtures. The forming bucky gel with ionic liquid allows for the new group of dissolving solvent. The dissolution behavior of SWNTs provides a route for SWNT dispersion/exfoliation in preparing electrically conductive films such as transparent electrode.

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Effects of carbon blacks on the electrical properties of EPDM compounds (EPDM 컴파운드의 전기적 특성에 미치는 카본블랙의 영향)

  • Lee, Chul-Ho;Cho, Yong-Suk;Jeon, Young-Jun;Kim, Sang-Wook
    • Proceedings of the KIEE Conference
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    • 1999.07d
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    • pp.1593-1595
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    • 1999
  • Effects of carbon black species and concentration on the mechanical and electrical properties of alumina trihydrate filled EPDM compounds were investigated. Mechanical properties improved with increasing carbon black concentration, and these effects were prominent in carbon blacks haying large specific area. In the case of non-conductive carbon black. tracking resistance improved when a small amount of carbon black was added to EPDM. Conductive carbon black showed detrimental effect to dielectric losses, volume resistivity and tracking resistance of EPDM compound.

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Technical Status of Carbon Nanotubes Composites (탄소나노튜브 복합체의 기술동향)

  • Lee, Jong-Il;Jung, Hee-Tae
    • Korean Chemical Engineering Research
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    • v.46 no.1
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    • pp.7-14
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    • 2008
  • Carbon nanotubes are considered as the most ideal nano filler in the field of composites with their excellent electrical, mechanical, and thermal properties. Therefore carbon nanotubes composites are increasingly utilized in conductive materials, structural material with high strength and low weight and multifunctional material. This review article describes recent research trend of carbon nanotubes synthesis, modification, various properties of the carbon nanotubes composites and their application. Furthermore the future development direction for the commercialization of carbon nanotubes composites is proposed.

Enhanced adhesion properties of conductive super-hydrophobic surfaces by using zirco-aluminate coupling agent

  • Park, Myung-Hyun;Ha, Ji-Hwan;Song, Hyeonjun;Bae, Joonwon;Park, Sung-Hoon
    • Journal of Industrial and Engineering Chemistry
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    • v.68
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    • pp.387-392
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    • 2018
  • Various technical approaches and concepts have been proposed to develop conductive super-hydrophobic (SH) surfaces. However, most of these approaches are not usable in practical applications because of insufficient adhesion and cost issues. Additionally, durability and uniformity issues are still in need of improvement. The goal of this research is to produce a large-area conductive SH surface with improved adhesion performance and uniformity. To this end, carbon nanotubes (CNT) with a high aspect ratio and elastomeric polymer were utilized as a conductive filler and matrix, respectively, to form a coating layer. Additionally, nanoscale silica particles were utilized for stable implementation of the conductive SH surface. To improve the adhesion properties between the SH coating layer and substrate, pretreatment of the substrate was conducted by utilizing both wet and dry etching processes to create specific organic functional groups on the substrate. Following pretreatment of the surface, a zirco-aluminate coupling agent was utilized to enhance adhesion properties between the substrate and the SH coating layer. Raman spectroscopy revealed that adhesion was greatly improved by the formation of a chemical bond between the substrate and the SH coating layer at an optimal coupling agent concentration. The developed conductive SH coating attained a high electromagnetic interference (EMI) shielding effectiveness, which is advantageous in self-cleaning EMI shielding applications.

A study on elastomer coating technology for continuous gradient conductive surface (연속 구배형 전도성 표면 구현을 위한 탄성중합체 코팅에 관한 연구)

  • La, Moon-Woo;Yoon, Gil-Sang;Park, Sung-Jea
    • Design & Manufacturing
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    • v.13 no.3
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    • pp.1-11
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    • 2019
  • Recently, studies on the development of flexible electronic devices by combining flexible materials and a conductor have been actively performed as interest in wearable devices. Especially, carbon nanotubes (CNT) or graphene coating have been used to construct a circuit to induce improvement in flexibility and rigidity. Various technologies have been developed in the surface coating of conductive materials, which are key to the manufacture of flexible electronic devices. Surface coating products with 3D coating and micro-patterns have been proposed through electrospinning, electrification, and 3D printing technologies. As a result of this advanced surface coating technology, there is a growing interest in manufacturing gradient conductive surfaces. Gradient surfaces have the advantage that they are adapted to apply a gentle change or to inspect optimum conditions in a particular region by imparting continuously changing properties. In this study, we propose a manufacturing technique to produce a continuous gradient conductive surface by combining a partial stretching of elastomer and a conductive material coating, and introduce experimental results to confirm its performance.

Dielectric Characteristics of the Polymers Containing Nano-size Conductive Carbon Black Powders (전도성 나노 카본 블랙을 함유한 고분자 재료의 유전특성)

  • 진우석;이대길
    • Composites Research
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    • v.17 no.5
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    • pp.68-77
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    • 2004
  • The electromagnetic (EM) absorption or shielding characteristics of a material is an important issue not only for military purpose but also for commercial purposes such as radar, electric or telecommunication devices. In order to design the effective electromagnetic wave absorber, the electromagnetic characteristics of the constituents of the material should be available in target frequency band. Also, it must be possible to predict the electromagnetic properties of absorbers with respect to the content of lossy ingredients. In this study, the dielectric properties of unsaturated polyester resins containing nano-size conductive carbon black powder were measured with a free space method in the X-band frequency range and analyzed with respect to the content of carbon black. Finally, the method for estimating the dielectric properties of polymeric resin containing conductive carbon black with respect to the EM frequency was developed and verified.