• 전기학회논문지
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• 제59권12호
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• pp.2230-2234
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• 2010

This paper deals with the change of surface potential decay, surface resistivity, contact angle and XPS of ultraviolet-treated PET films. From the experimental results on the surface potential decay of UV degraded-samples, it was found that the accumulation of charge is decreased and the surface potential decay time is shortened. Also, from the result of XPS, it was found that the changes affected by the surface degradation of PET film were caused by the generation of carboxyl groups through the chain decomposition and recombination with oxygen molecules in the air.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1908-1912
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• 2008

Conductive polymers, prepared by mixing electrically conductive fillers with a suitable polymeric formulation, are widely used in applications such as interconnecting materials for high density electronic packaging. However, resins of conductive pastes used as binders and vehicles are generally nonconductive, so that they may prevent the electrical contact between conductive fillers and reduce electron transmission. In this study, we improved conductivity of silver paste by the incorporation of cabon nanotubes. It is important to achieve homogeneous dispersion of CNTs to act as reinforcements efficiently in matrix. We carried out acid treatment on nanotubes for their homogeneous dispersion in silver/conducting polymer matrix. The dispersion states of nanotubes were characterized by raman spectra and filed emission scanning electron microscope. The electrical resistivity of CNTs incorporated silver paste was also measured by 4-point probe method.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2000년도 제18회 학술발표회 논문개요집
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• pp.59-59
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• 2000

Recently low resistance of bus line is required for large screen size TFT-LCD panels. As a result, lower resistance Al-alloy is currently reviewed extensively. The resistivity is required smaller than 10 $\mu$$\Omega$cm. In this paper, Al-Nd thin film were deposited on glass substrates by D.C. magnetron sputtering system under various condition. Its properties were characterized by SEM, AFM, XRD, 4-ping-probe. The optimal condition of Al-Nd was 12$0^{\circ}C$, 125W, 0.4Pa, 30sccm(Ar) and 35$0^{\circ}C$, 20min. annealing. At that condition the resistivity of Al-Nd(2wt.%) was about 4 $\mu$$\Omega$cm. The minimum contact resistance of ITO/Nd was about 110$\mu$$\Omega$cm in the condition of 30$0^{\circ}C$, Ar 30 sccm. O2.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.1175-1176
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• 2006

Influences of machining on magnetic properties of soft magnetic composites (SMC's) with addition of two kinds of binder, i.e., organic binder and inorganic one, were investigated. Machining does not affect DC magnetic properties of the SMC compacts. This can be ascribed to their particular structure in which the ironpowder particles are highly isolated by the binder. On the other hand, decrease in resistivity and resultant increase in eddy current loss was confirmed in the machined compacts containing inorganic binder. It is supposed that the brittleadditive binder existing between the iron particles is partly broken, and iron-to-iron contact is formed on the machined surface.

• 대한전기학회논문지
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• 제37권1호
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• pp.55-62
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• 1988

The variation of electrical resistivity of silver particle-filled polymers with the volume percent of silver particles was investigated. Also, the relationships between the surface tension of polymer and dispersion effect of silver particles were studied to find the steep drop of electrical resisivity, in view of agglomerate morphology. The critical volume precent of silver particles varied depending on the polymer species and increased with the increasing surface tension of polymer. The steep variation of resistivity with the increasing temperature was explained with the expansion of polymer at the melting temperature of polymer. The conductive break down current increased with the increasing volume percent of silver particles in the Ag/LDPE system and that was attributed to heat of Joule taken througn the contact area between the silver particle.

• Geomechanics and Engineering
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• 제30권4호
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• pp.337-343
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• 2022

The electrical resistivity method is a well-known geophysical method for observing underground conditions, (such as anomalies) and the properties of soil and rock (such as porosity, saturation, and pore fluid characteristics). The shape of electrodes used in an electrical resistivity survey depends on the purpose of the survey and installation conditions. Most electrodes for field applications are cylindrical for sufficient contact with the ground, while some are conically sharpened at their tips for convenient penetration. Previous study only derived theoretical equations for rod-shaped electrodes with spherical tips. In this study, the theoretical resistance for two cylindrical electrodes with conical tips is derived and verified experimentally. The influence of the penetration depth and tip on the measurement is also discussed.

• 한국지구과학회지
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• 제35권1호
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• pp.29-40
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• 2014

콘크리트 도로 하부의 이상대를 찾기 위해 전기비저항 탐사를 수행하였다. 콘크리트의 접지저항효과를 줄이기 위해 전기전도성이 좋은 매질과 평판 전극을 이용하였다. 전기비저항 탐사 결과를 분석하고 같은 장소에서 수행한 지하투과레이더 탐사, 충격응답기법, 다중채널 표면파 탐사 결과와 비교하였다. 전기비저항 탐사 결과는 함몰과 포장 구간에서 높은 비저항 분포를 보였으며, 지하투과레이더 탐사 결과는 보강으로 인한 형태를 보였다. 또한 충격응답기법과 전기비저항 탐사 결과의 비교를 통하여 보강 구간에서의 높은 동적강성도가 높은 비저항 분포의 원인임을 확인하였다. 동일한 장소에서 수행한 전기비저항 탐사와 다중채널 표면파 탐사 결과를 공동 크리깅한 결과, 지구통계학적 복합 해석이 각 지구물리 탐사결과에 대한 개별적인 분석보다 더 명확하게 이상대를 확인 할 수 있었다. 이 연구는 지구물리 탐사에 기초한 의사결정 과정에서 지구통계학을 이용한 복합 해석 결과의 활용 가능성을 제시한다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2009년도 춘계학술발표대회 논문집
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• pp.214-219
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• 2009

In high-efficiency crystalline silicon solar cells, If high-efficiency solar cells are to be commercialized. It is need to develop superior contact formation method and material that can be inexpensive and simple without degradation of the solar cells ability. For reason of plated metallic contact is not only high metallic purity but also inexpensive manufacture. It is available to apply mass production. Especially, Nickel, Copper and Silver are applied widely in various electronic manufactures as easily formation is available by plating. The metallic contact system of silicon solar cell must have several properties, such as low contact resistance, easy application and good adhesion. Ni is shown to be a suitable barrier to Cu diffusion as well as desirable contact metal to silicon. Nickel monosilicide(NiSi) has been suggested as a suitable silicide due to its lower resistivity, lower sintering temperature and lower layer stress than $TiSi_2$. Copper and Silver can be plated by electro & light-induced plating method. Light-induced plating makes use the photovoltaic effect of solar cell to deposite the metal on the front contact. The cell is immersed into the electrolytic plating bath and irradiated at the front side by light source, which leads to a current density in the front side grid. Electroless plated Ni/ Electro&light-induced plated Cu/ Light-induced plated Ag contact solar cells result in an energy conversion efficiency of 14.68 % on $0.2{\sim}0.6{\Omega}{\cdot}cm,\;20{\times}20mm^2$, CZ(Czochralski) wafer.

• 한국터널지하공간학회 논문집
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• 제21권2호
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• pp.267-278
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• 2019

터널의 안정적인 시공을 위해 터널 굴진 도중 터널 전방의 이상영역을 확인할 수 있는 다양한 방법의 터널전방예측 기법들이 사용되고 있다. 터널전방예측 방법 중 하나인 2전극 전기비저항 탐사(Pole-Pole array)는 터널직경 5배 이내의 함수대, 연약대 등을 확인하기 위해 자주 사용되고 있다. 2전극 전기비저항 탐사 시 가장 중요한 것 중 하나는 원지반의 전기비저항값을 유추하는 것이며, 원지반의 전기비저항은 1) 지반과 전극의 접촉면적을 계산하고, 2) 그와 동일한 표면적을 가지는 반구형으로 가정하는 과정을 거쳐 얻어진다. 이러한 가정은 지반과 전극이 접촉하는 면적이 적고 충분한 거리가 떨어져야 한다. 하지만 전극의 크기, 형태 및 전극사이의 거리에 따라 실제 측정되는 저항이 달라지므로 이에 대한 정확한 평가가 필요하다. 따라서 본 연구에서는 전기비저항 탐사에서 주로 사용되는 원기둥형 전극의 크기와 전극사이의 거리에 따른 영향에 관한 이론식을 유도하고, 실험 연구를 통해 검증하였다. 이를 바탕으로 원기둥형 전극의 관입깊이가 반지름에 비해 큰 경우, 등가 반구형 전극의 가정을 사용하면 에러가 증가하므로 적용 시 주의해야 함을 확인하였다.

• Korean Chemical Engineering Research
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• 제49권2호
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• pp.195-199
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• 2011

DC 마그네트론 스퍼터링 방법을 이용하여 soda lime glass 위에 Mo 박막을 증착하였다. DC power와 증착 압력을 변화시키면서 상온에서 Mo 박막을 증착하였고 증착된 박막의 전기적 성질 및 구조적 성질을 조사하였다. DC power가 증가할수록 박막의 증착속도는 증가되었고 전기 저항도는 감소하였으며 박막의 결정성이 향상되는 것을 관찰할 수 있었다. 증착 압력이 감소할수록 박막의 증착속도와 전기 저항도가 감소하였으며 가늘고 긴 모양의 결정입자가 조밀하게 박막을 형성하였다. 압력이 증가함에 따라서 결정입자는 원형으로 변형되었으며 박막의 표면에 공극의 생성이 증가하였다. Mo 박막의 전기 저항도는 Mo 원자에 결합된 산소의 양이 많아질수록 증가하게 되고, 박막의 결정성이 높아지면 산소의 결합도가 감소하여 낮은 저항도를 갖게 되는 것을 확인하였다.