• Title/Summary/Keyword: carbon semiconductor

검색결과 301건 처리시간 0.028초

Fabrication and Electrical Properties of Highly Organized Single-Walled Carbon Nanotube Networks for Electronic Device Applications

  • Kim, Young Lae
    • Journal of the Korean Ceramic Society
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    • 제54권1호
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    • pp.66-69
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    • 2017
  • In this study, the fabrication and electrical properties of aligned single-walled carbon nanotube (SWCNT) networks using a template-based fluidic assembly process are presented. This complementary metal-oxide-semiconductor (CMOS)-friendly process allows the formation of highly aligned lateral nanotube networks on $SiO_2/Si$ substrates, which can be easily integrated onto existing Si-based structures. To measure outstanding electrical properties of organized SWCNT devices, interfacial contact resistance between organized SWCNT devices and Ti/Au electrodes needs to be improved since conventional lithographic cleaning procedures are insufficient for the complete removal of lithographic residues in SWCNT network devices. Using optimized purification steps and controlled developing time, the interfacial contact resistance between SWCNTs and contact electrodes of Ti/Au is reached below 2% of the overall resistance in two-probe SWCNT platform. This structure can withstand current densities ${\sim}10^7A{\cdot}cm^{-2}$, equivalent to copper at similar dimensions. Also failure current density improves with decreasing network width.

Output Characteristics of Carbon-nanotube Field-effect Transistor Dependent on Nanotube Diameter and Oxide Thickness (나노튜브 직경과 산화막 두께에 따른 탄소나노튜브 전계 효과 트랜지스터의 출력 특성)

  • Park, Jong-Myeon;Hong, Shin-Nam
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • 제26권2호
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    • pp.87-91
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    • 2013
  • Carbon-nanotube field-effect transistors (CNFETs) have drawn wide attention as one of the potential substitutes for metal-oxide-semiconductor field-effect transistors (MOSFETs) in the sub-10-nm era. Output characteristics of coaxially gated CNFETs were simulated using FETToy simulator to reveal the dependence of drain current on the nanotube diameter and gate oxide thickness. Nanotube diameter and gate oxide thickness employed in the simulation were 1.5, 3, and 6 nm. Simulation results show that drain current becomes large as the diameter of nanotube increases or insulator thickness decreases, and nanotube diameter affects the drain current more than the insulator thickness. An equation relating drain saturation current with nanotube diameter and insulator thickness is also proposed.

Combustibility Improving Effect of Organometallic Salt for Fuel Oil (燃料油 燃燒에 미치는 有機金屬鹽의 助燃效果)

  • Yong Shik Kang
    • Journal of the Korean Chemical Society
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    • 제15권6호
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    • pp.330-347
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    • 1971
  • Catalytic effects of metallic salts on the combustion of diesel fuel oil have been studied. In the case of organometallic salt, the active species are the metallic oxides resulted from combustion of the salts. The oxides act only on the residual solid carbon produced from the fuel oil combustion. The catalytic activity can be explained with the semiconductor theory just as in the case of the gas phase reaction. The chemical rate constant of the combustion of carbon, the soot from diesel fuel oil, is found to be $k_c=1.1{\times}10^4\;exp$ (-16,600/T) below $800^{\circ}K$. By addition of metallic oxides, the rate constant increases remarkably. This work has substantiated the belief that the effect of the metallic salts on the fuel oil combustion can conveniently be studied by checking directly the effect of the corresponding metallic oxide on the soot carbon.

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Detection of Toxic Heavy Metal, Co(II) Trace via Voltammetry with Semiconductor Microelectrodes

  • Ly, Suw Young;Lee, Chang Hyun;Koo, Jae Mo
    • Toxicological Research
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    • 제33권2호
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    • pp.135-140
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    • 2017
  • The cobalt (Co(II)) ion is a main component of alloys and considered to be carcinogenic, especially due to the carcinogenic and toxicological effects in the aquatic environment. The toxic trace of the Co(II) detection was conducted using the infrared photodiode electrode (IPDE) using a working electrode, via the cyclic and square-wave anodic stripping voltammetry. The results indicated a sensitive oxidation peak current of Co(II) on the IPDE. Under the optimal conditions, the common-type glassy carbon, the metal platinum, the carbon paste, and the carbon fiber microelectrode were compared with the IPDE in the electrolyte using the standard Co(II). The IPDE was found to be far superior to the others.

Monolithic Integration of Arrays of Single Walled Carbon Nanotubes and Sheets of Graphene

  • Hong, Seok-Won
    • Proceedings of the Materials Research Society of Korea Conference
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    • 한국재료학회 2012년도 춘계학술발표대회
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    • pp.68.2-68.2
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    • 2012
  • We present a scheme for monolithically integrating aligned arrays of single walled carbon nanotubes (SWNTs) with sheets of graphene, for use in electronic devices. Here, the graphene and arrays of SWNTs are formed separately, using chemical vapor deposition techniques onto different, optimized growth substrates. Techniques of transfer printing provide a route to integration, yielding two terminal devices and transistors in which patterned structures of graphene form the electrodes and the SWNTs arrays serve as the semiconductor. Electrical testing and analysis reveal the properties of optically transparent transistors that use this design, thereby giving insights into the nature of contacts between graphene and SWNTs.

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Localized Corrosion of Zn-Plated Carbon Steel Used as a Fire Sprinkler Pipe

  • Lee, Jin Hee;Lee, You-Kee;Lee, Kyu Hwan;Kim, Dong-Kyu;Lee, Sung Gun;Lee, Sang Hwa;Kim, Insoo
    • Corrosion Science and Technology
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    • 제8권4호
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    • pp.148-152
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    • 2009
  • The failure of a Zn-plated carbon steel pipe that served as a fire sprinkler was investigated in terms of the pipe's corrosion products. The pipes leaked through holes formed beneath the tubercles. The formation of oxygen concentration cell involves colonization of metal surface by aerobic bacteria or other slime formers, and anodic reaction beneath tubercle is accelerated by the presence of SRB, leading to the formation of hole beneath tubercle.

Water Vapor Supply Study for Air and Carbon dioxide (공기와 이산화탄소 가스에 수분공급을 위한 연구)

  • Lee, Taeck Hong;Park, Tae Seong;Kim, Tae Wan;Noh, Jae Hyun;Kang, Young Jin;Lee, Seung Yong
    • Transactions of the Korean hydrogen and new energy society
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    • 제25권1호
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    • pp.72-78
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    • 2014
  • The study has been designed to develop water vapor supply for semiconductor industry, industrial gas manufacturing, impurities analysis, and fuel cell. Water concentration in air reached $1019{\mu}mol/mol$ at dew temp ($-20^{\circ}C$) and water concentration in CO2 reached $127{\mu}mol/mol$ at dew temp ($-40^{\circ}C$. Carbon dioxide needs more wet gas than air because interaction potential of carbon dioxide shows more strong attraction than air.

Development of Two-Step Surface Treatment on Carbon Nanotube Cathode for Backlight Unit Application

  • Ha, Sang-Hoon;Jung, Dea-Hwa;Park, Ki-Jung;Kwon, Na-Hyun;Choi, Young-Jun;Chang, Ji-Ho;Cho, Young-Rae
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.152-155
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    • 2009
  • A novel two-step surface treatment was developed and demonstrated for the carbon nanotube (CNT) cathode with highly efficient backlight unit application. An adhesive taping method was applied firstly and then followed by a post-heat treatment for the CNT cathode. During the postheat treatment process, some residues covering the CNTs were burned out. The post-heat treatment enhanced the emission current of the CNT cathode around 20% compared with that of no heat-treated sample.

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Effect of Additives and Plating Conditions on Sn-Pb Alloy Film of Semiconductor Formed by High Speed Electroplating (전해도금에 의해 형성된 반도체 금속도금용 주석-납 합금피막의 첨가제 및 전해조건의 영향)

  • 정강효;김병관;박상언;김만;장도연
    • Journal of the Korean institute of surface engineering
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    • 제36권1호
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    • pp.34-41
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    • 2003
  • Effects of additives and plating conditions of high speed electroplating were investigated. The Sn content in electrodeposit was highly decreased with increasing current density from $10A/dm^2$ to $50A/dm^2$, and the current efficiency on the cathode was decreased. The carbon content in the electrodeposit was decreased with increasing current density from $10A/dm^2$ to $30A/dm^2$, however the carbon content was highly increased in the range of $40A/dm^2$$∼50A/dm^2$. The formation of tetravalent tin and stannic oxide sludge was prevented by the addition of gallic acid in the bath. The changing of Sn content in the electrodeposit is caused by the addition of gallic acid.

Relative Content Evaluation of Single-walled Carbon Nanotubes using UV-VIS-NIR Absorption Spectroscopy

  • Cha, Ok-Hwan;Jeong, Mun-Seok;Byeon, Clare C.;Jeong, Hyun;Han, Jong-Hun;Choi, Young-Chul;An, Kay-Hyeok;Oh, Kyung-Hui;Kim, Ki-Kang;Lee, Young-Hee
    • Carbon letters
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    • 제10권1호
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    • pp.9-13
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    • 2009
  • We propose an evaluation method of the relative content of single-walled carbon nanotubes (SWCNT) in SWCNT soot synthesized by arc discharge using UV-VIS-NIR absorption spectroscopy. In this method, we consider the absorbance of semiconducting and metallic SWCNTs together to calculate the relative content of SWCNTs with respect to a highly purified reference. Our method provides the more reliable and realistic evaluation of SWCNT content with respect to the whole carbonaceous content than the previously reported method.