• Title/Summary/Keyword: conductive oxide electrode

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Effect of Thermal Treatment Temperature on Lifespan of Conductive Oxide Electrode

  • Yoo, Y.R.;Chang, H.Y.;Jang, S.G.;Nam, H.S.;Kim, Y.S.
    • Corrosion Science and Technology
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    • v.6 no.2
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    • pp.44-49
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    • 2007
  • Dimensionally stable anodes have been widely used to cathodically protect the metallic materials in corrosive environments including concrete structure as the insoluble anode. Lifespan of the anode for concrete construction can be determined by NACE TM0294-94 method. Lifespan of conductive oxide electrode would be affected by thermal treatment condition in the process of sol-gel coatings. This work aims to evaluate the effect of thermal treatment temperature on the lifespan of the $RuO_{2}$ electrode. $450^{\circ}C$ treated conductive oxide electrode showed the excellent properties and its lifespan was evaluated to be over 88 years in 3% NaCl, 4% NaOH, and simulated pore water. This behavior was related to the formation of $RuO_{2}$.

Carbon Nanotube (CNT) based Transparent Conductive Films for Display Applications (탄소나노튜브 기반 투명전도성 필름 및 이의 응용)

  • Lee, Geon-Woong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.77-77
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    • 2007
  • The development of next generation displays such as flexible display is a major challenge. Most materials and processes in current flat panel display industry cannot be transferred to flexible substrates. Typically, indium tin oxide (ITO) thin films are brittle and need to be deposited at high temperature to achieve an optimal opto-electrical property, therefore ITO films cannot be used as a flexible electrode. Up to date, many alternative materials to ITO have been proposed such as conductive polymers, nanometals, solution deposited transparent conductive oxide(TCO) and carbon nanotubes(CNTs). CNT based transparent conductive films are fabricated on glass and polymer substrates. CNT thin films exhibit a sheet resistance ($R_s$) of nearby $10^3\;{\Omega}/sq$ with a transmittance of around 80% on the visible light range, which is attributed by excellent dispersion and interaction among CNTs, solvents and polymeric binders. This talk will present the current studies, opto-electrical properties, design criteria and its applications for CNT-based transparent conductive films.

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Preparation and application of reduced graphene oxide as the conductive material for capacitive deionization

  • Nugrahenny, Ayu Tyas Utami;Kim, Jiyoung;Kim, Sang-Kyung;Peck, Dong-Hyun;Yoon, Seong-Ho;Jung, Doo-Hwan
    • Carbon letters
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    • v.15 no.1
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    • pp.38-44
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    • 2014
  • This paper reports the effect of adding reduced graphene oxide (RGO) as a conductive material to the composition of an electrode for capacitive deionization (CDI), a process to remove salt from water using ionic adsorption and desorption driven by external applied voltage. RGO can be synthesized in an inexpensive way by the reduction and exfoliation of GO, and removing the oxygen-containing groups and recovering a conjugated structure. GO powder can be obtained from the modification of Hummers method and reduced into RGO using a thermal method. The physical and electrochemical characteristics of RGO material were evaluated and its desalination performance was tested with a CDI unit cell with a potentiostat and conductivity meter, by varying the applied voltage and feed rate of the salt solution. The performance of RGO was compared to graphite as a conductive material in a CDI electrode. The result showed RGO can increase the capacitance, reduce the equivalent series resistance, and improve the electrosorption capacity of CDI electrode.

Electrical and Optical Properties of OLED with AZO Anode Electrode (AZO anode 전극을 갖는 OLED의 전기적, 광학적 특성)

  • Jin, Eun-Mi;Shin, Eun-Chul;Song, Min-Jong;Park, Choon-Bae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.11a
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    • pp.91-92
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    • 2006
  • Aluminum-doped zinc oxide (AZO) films are attractive materials as transparent conductive electrode because they are inexpensive, nontoxic and abundant element compared with indium tin oxide (ITO). AZO films have been deposited on glass (corning 1737) substrates by RF magnetron sputtering system. The electrical resistivity of AZO films was $1.81{\times}10^{-2}{\Omega}cm$ and the average transmittance in the visible range 400-800 nm was more than 76% Organic light-emitting diodes (OLEDs) with AZO/TPD/$Alq_3$/Al configuration were fabricated. The current density-voltage properties of devices were studied and compared with ITO devices fabricated under the same conditions.

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Physioelectrochemical Investigation of Electrocatalytic Oxidation of Saccharose on Conductive Polymer Modified Graphite Electrode

  • Naeemy, A.;Ehsani, A.;Jafarian, M.;Moradi, M.
    • Journal of Electrochemical Science and Technology
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    • v.6 no.3
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    • pp.88-94
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    • 2015
  • In this study we investigated the electrocatalytic oxidation of saccharose on conductive polymer- Nickel oxide modified graphite electrodes based on the ability of anionic surfactants to form micelles in aqueous media. This NiO modified electrode showed higher electrocatalytic activity than Ni rode electrode in electrocatalytic oxidation of saccharose. The anodic peak currents show linear dependency with the square root of scan rate. This behavior is the characteristic of a diffusion controlled process. Under the CA regime the reaction followed a Cottrellian behavior and the diffusion coefficient of saccharose was found in agreement with the values obtained from CV measurements.

Electrode Polarization and Interfacial Polarization in Composite of Ion conductive Polymer and PZT particles (이온전도성 고분자와 PZT미립자의 복합체에 있어서 전극분극과 계면분극 현상)

  • Park, Sang-Ho;Kang, Dae-Ha
    • Proceedings of the KIEE Conference
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    • 2005.07c
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    • pp.1838-1840
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    • 2005
  • Dielectric and conductive spect frequency spectra in a $1Hz{\sim}13MHz$ range have been measured for the composite consisting of PZT inclusions dispersed in a $LiClO_4$ doped polyethylene oxide(Li_PEO) matrix with various volume fractions. The dielectric and conductive spectra of the composites revealed the relaxations related with electrode polarization and interfacial polarization The observed spectra were reproduced using the empirical function and we could obtain vairous parameters related to electrode polarization and interfacial polarization.

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A study on the electrical switching properties of oxide metal (산화금속의 전기적 스위칭 특성 연구)

  • Choi, Sung-Jai;Lee, Won-Sik
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.9 no.3
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    • pp.173-178
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    • 2009
  • We have investigated the electrical properties of oxide metal thin film device. The device has been fabricated top-top electrode structure and its transport properties are measured in order to study the resistance change. Electrical properties with linear voltage sweep on a electrodes are used to show the variation of resistance of oxide metal thin film device. Fabricated oxide metal thin film device with MIM structure is changed from a low conductive Off-state to a high conductive On-state by the external linear voltage sweep. The $Si/SiO_2/MgO$ device is switched from a high resistance state to a low resistance state by forming. Consequently, we believe oxide metal is a promising material for a next-generation nonvolatile memory and other electrical applications.

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Flexible ITO/PEDOT:PSS Hybrid Transparent Conducting Electrode for Organic Photovoltaics

  • Lim, Kyounga;Jung, Sunghoon;Kang, Jae-Wook;Kim, Jong-Kuk;Kim, Do-Geun
    • Proceedings of the Korean Vacuum Society Conference
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    • 2013.02a
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    • pp.299-299
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    • 2013
  • Indium Tin Oxide (ITO) has widely been used as a transparent conductive oxide (TCE) for photovoltaic devices. Lately, flexibility of ITO becomes an issue as demand of flexible device increases. Several scientists have tried to substitute ITO to different materials such as conductive polymer, graphene, CNT, and metal nanowire because of ITO brittleness. Among the substitute materials, PEDOT:PSS has mostly paid attention because PEDOT:PSS has excellent flexibility and good conductivity. The conductivity of PEDOT:PSS increases up to 1000 S/cm with additives such as DMSO, EG, sorbitol, and so on. In our research group, we introduce a conductive polymer PEDOT:PSS as a buffer layer to improve not only flexibility but also conductivity. As PEDOT:PSS layer forms beneath ITO thin film (20 nm), sheet resistance decreases from $230{\Omega}$/${\Box}$ to $85{\Omega}$/${\Box}$ and crack initiation decreases from 4.5 mm to 3.5 mm as well. We have fabricated organic photovoltaic device and power conversion efficiencies using conventional ITO electrode and ITO/PEDOT:PSS hybrid electrode. The photovoltaic property such as power conversion efficiency for ITO/PEDOT:PSS hybrid electrode is comparable to the value obtained using conventional ITO electrode on glass substrate.

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Fabrication of a Transparent Electrode for a Flexible Organic Solar Cell in Atomic Layer Deposition (ALD 공정을 이용한 플렉시블 유기태양전지용 투명전극 형성)

  • Song, Gen-Soo;Kim, Hyoung-Tae;Yoo, Kyung-Hoon
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.121.2-121.2
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    • 2011
  • Aluminum-doped Zinc Oxide (AZO) is considered as an excellent candidate to replace Indium Tin Oxide (ITO), which is widely used as transparent conductive oxide (TCO) for electronic devices such as liquid crystal displays (LCDs), organic light emitting diodes (OLEDs) and organic solar cells (OSCs). In the present study, AZO thin film was applied to the transparent electrode of a channel-shaped flexible organic solar cell using a low-temperature selective-area atomic layer deposition (ALD) process. AZO thin films were deposited on Poly-Ethylene-Naphthalate (PEN) substrates with Di-Ethyl-Zinc (DEZ) and Tri-Methyl-Aluminum (TMA) as precursors and $H_2O$ as an oxidant for the atomic layer deposition at the deposition temperature of $130^{\circ}C$. The pulse time of TMA, DEZ and $H_2O$, and purge time were 0.1 second and 20 second, respectively. The electrical and optical properties of the AZO films were characterized as a function of film thickness. The 300 nm-thick AZO film grown on a PEN substrate exhibited sheet resistance of $87{\Omega}$/square and optical transmittance of 84.3% at a wavelength between 400 and 800 nm.

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Dielectric Properties in Composite of Ion-Conductive Polymer and PZT Particles (이온전도성 고분자와 PZT미립자 복합체의 유전특성)

  • Park Sang-Ho;Kang Dae-Ha
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.2
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    • pp.61-67
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    • 2006
  • Dielectric and conductive frequency spectra in 0.01 Hz-13 MHz range have been measured for the composite consisting of PZT inclusions dispersed in $LiCIO_{4}$-doped polyerhylene oxide(Li_PEO) matrix with various volume fractions. The dielectric and conductive spectra of the composites revealed the relaxations related with electrode polarization and interfacial polarization. The observed spectra were reproduced using the empirical dielectric function and we could obtain various parameters related to the above two kinds of polarizations and dicussed about the parameters.