• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1353_1354
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• 2009

The OTFT devices had inverted staggered structures of Au/pentacene/ppMMA/ITO on PET substrate. The overall device performances of the flexible devices such as the operating voltage, the field effect mobility, the on/off ratio and the off current are somewhat worse than those of devices fabricated on glass substrates. Pentacene/ppMMA OTFT benchmarks (mobility, sub-threshold slope, on/off ratio) were comparable to that of solution cast PMMA, but below average when compared to other polymer gate dielectrics. However, threshold and drive voltages were among the lowest reported for a polymer gate dielectric, and surpassed only by ultra-thin SAM gate dielectrics.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1991년도 추계학술대회 논문집
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• pp.79-82
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• 1991

In this paper we examined, by using the PET film with thickness of 16-350$\mu\textrm{m}$, space charge focused on TSC peak at the slightly higher temperature than transition temperture of the glass. In the result we found that charge quantity, leaking current and absorbing current at TSC peak were rarely dependant its thickness at the Al foil contact electrde. In the case of Al evaporated electrode, the absorbing current was rarely dependent its thickness but TSC charge quantity at C-peak was increased directly proportional to its thickness and leaking current was decayed inversely proportional to its thickness. Also current-volteag characteristics showed sublinerar property under ohmic area at the Al evaporated electrode.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1998년도 추계학술대회 논문집
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• pp.223-226
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• 1998

Organic conducting N-methyl phenazinium TCNQ (7,7,8,8-tetracyanoquinonedimethane) ion radical salt was synthesized and characterized by FTIR, EA. After blending this material with PMMA using NMP/DMF, the solution was bar-coated on a PET film and dried at 40$^{\circ}C$. The optical micrograph showed the fibril crystals. The surface resistivity was 10$\^$5/ $\Omega$/$\square$. The conductivity decreased considerably at temperatures above 80$^{\circ}C$, although it decreased slightly at RT and 4$^{\circ}C$.

• Transactions on Electrical and Electronic Materials
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• 제5권4호
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• pp.153-157
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• 2004

ITO thin films were deposited on PET and soda-lime glass substrates by a dc reactive magnetron sputtering of In-Sn alloy metal target without substrate heater and post-deposition thermal treatment. The dependency of rf-bias voltage and substrate power during deposition processing was investigated to control the electrical and optical properties of ITO films. The range of rf bias voltage is from 0 to -80 V and the substrate power is applied from 10 to 50 W. The minimum resistivity of ITO film is 5.4${\times}$10$^{-4}$ $\Omega$cm at 50 W power and rf-bias voltage of -20 V. The best transmittance of ITO films at 550 nm wavelength is 91 % in the substrate power of 30 W and rf-bias voltage of -80 V.

• Bulletin of the Korean Chemical Society
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• 제31권9호
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• pp.2557-2560
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• 2010

To assay for antioxidant capacity of natural products considered important in producing human health benefits, a practical and economical method using pellet techniques was developed. A standard visualizing reagent, 1,1diphenyl-2-picryl-hydrazyl (DPPH), was mixed with a water-miscible polyvinyl alcohol (PVA), serving as a solid phase support for the DPPH reagent. A DPPH pellet was prepared by dropping a small volume of the DPPH solution onto PET film, and drying in an oven. The PVA-based DPPH pellet was dissolved into water, in which the water-miscible PVA plays as a non-ionic surfactant to help the DPPH reagent to be dissolved into the solvent. Using the DPPH assay, the antioxidant capacity of water-soluble extracts of black soybean, barley, green tea, and green gram was examined. Among the natural products tested, green tea showed the highest antioxidant capacity. This PVA-based DPPH antioxidant assay can be further applied in the natural food, raw plant material, and health product inspection field.

• 한국전기전자재료학회논문지
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• 제25권4호
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• pp.282-285
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• 2012

It is well known that Zinc Oxide (ZnO) is an attractive material for its various applications. ZnO has been mostly used as a transparent conducting oxide in liquid crystal displays, solar cells due to its advantages of low cost, high productivity, and excellent electrical conductivity. Notably, flexible-dye-sensitized solar cells (DSSCs) based on polyethylene terephthalate (PET) substrates require low temperature sintering processing conditions. Therefore, low temperature processing conditions have been strongly required for transparent conducting film applications. In this paper, we prepared low temperature-sintered ZnO ceramics employing Li as a sintering aid.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.342.2-342.2
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• 2014

IZO, ITO, ITO 등의 투명전극들 중 Indium Tin Oxide (ITO) 다른 전극에 비해 높은 광투과도와 낮은 저항으로 인하여 다양한 부분에서 널리 이용되고 있다. 본 연구에서는 우수한 투과도의 멀티 layer 단열 창호를 위한 film 개발을 위해 RF magnetron system을 이용하여 Sodalime Glass와 polyethylene terephthalate (PET) substrate에 ITO를 증착함으로써 전기적 광학적 특성을 조사하였다. 실험은 power 변화와 Ar, O2의 가스 분압비, Working Pressure의 변화를 변수로 두어 진행하였다. 측정은 Ellipsometry를 이용하여 광학적인 두께와 굴절률을 조사하였고 UV visible spectrometer를 통해 광학적인 투과도를 확인하였다. Power는 100 Watt 늘려가며 진행하였고 O2 유량의 변화에 따라 투과도와 면저항, 굴절률 특성이 달라짐을 확인할 수 있었다. O2의 유량에 따라 면저항이 줄어들다가 어느 정도 이상이 되면 급격히 증가함을 확인할 수 있었다. Working Pressure 변화에 따른 전기적 광학적 특성 또한 확인 하였다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.177.2-177.2
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• 2014

현재 플렉시블 전자기기에 대한 수요가 증가함에 따라 Ag nanowire는 ITO 대체용 투명전극 물질로 주목받고 있다. Ag nanowrie 투명전극은 면저항이 약 $300{\Omega}/sq$ 정도인 PEDOT 투명전극 보다 성능이 우수하지만, 표면에 나노와이어의 적층으로 100 nm 크기의 돌기들이 존재하여 균일한 표면특성이 요구되는 투명전극에 불리한 요인이 된다. Ag nanowire를 투명전극으로 사용하여 OLED를 제조할 경우, 40 nm~100 nm의 두께를 갖는 HTL층보다 투명전극 표면의 Rpv 값이 큰 경우 Leakage current가 증가하므로 이러한 돌기들을 감소시키는 것이 Ag nanowire를 투명전극에 적용할 수 있는 중요한 요건이 된다. 본 연구에서는 PET film 위에 Ag nanowire를 얇게 코팅하여 투과도 약 87%, 면저항 $20{\Omega}/sq$ 이하의 특성을 갖는 투명전극을 제조하였다. 그리고 Ag nanowire를 코팅한 투명전극의 표면 Roughness를 감소시키기 위해 Roll press를 이용하여 나노와이어를 물리적으로 압착하였고, 압착된 Ag nanowire 투명전극 위에 PEDOT를 코팅하여 전도도 및 표면 Roughness를 감소시키는 연구를 진행하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.593-594
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• 2006

A novel thermal transfer method was developed to form the phosphor screen for VPT(Video Phone Tube). This method have advantages of simple process, clean environment, saving raw material and running-cost comparison of electrodeposition, spin coating of conventional methods. But now applying phosphor screen for thermal transfer method has been formed three layers (phosphor layer, ITO layer and thermal adhesive layer) on the PET film as substrate. This is complex process, run to waste of raw-material and require of high cost. Also ITO paste at present has been imported from Japan. To improve these problems, we have manufactured phosphor screen formed by two layers (phosphor layer and ITO layer). We have developed ITO paste that had both conductive and excellent thermal transfer abilities, made it of domestic raw-material.

• 유변학
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• 제6권2호
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• pp.139-146
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• 1994

미연신, 비결정 PET 필름의 띠연신조건(띠연신 응력, 띠연신 온도, 띠열판의 상승속 도)에 따른 필름의거동을 연구하였다. 띠열판의 상승속도가 10, 20, 30, 50 mm/min일 때 온 도(Td) 이하에서는 임계네킹응력이 띠연신 온도가 증가함에 따라 급격히 감소하고 그 온도 이상에서는 거의 변하지 않고 일정했으며 임계온도 이하에서는 임계온도와 띠연신 온도의 온도차(Tc-Td)가 임계네킹응력과 비례관계를 가져 다음과 같은 간단한 실험식을 얻었다. $\sigma$c=0.838 (Tc-Td)+$\sigma$0 임계네킹응력에서 띠연신한 필름의 치수는 연신 온도와 띠열판의 상 승속도에 거의 의존하지 않고 일정한 값을 나타내었다. 임계네킹응력 이상에서는 연신 조건 에 따라 필름의 폭, 두께, 그리고 연신비가 거의 변하지 않았다.