• 공업화학
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• 제23권1호
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• pp.53-58
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• 2012

투명한 플라스틱 필름의 표면경도를 향상시키기 위하여 유-무기 하이브리드 코팅 용액을 졸-겔 공정을 이용하여 합성하였다. 무기성분으로 콜로이드 실리카와 유기성분으로 PMMA, 유-무기 성분 간의 결합력을 향상시켜 하이브리드 코팅 층의 특성을 더욱 향상시키기 위하여 실란커플링제로서 vinyl trimethoxy silane (VTMS)과 [3-(metha cryloyloxy)] propyl trimethoxy silane (MAPTMS)를 이용하였고, 알콕시 실란의 종류, 콜로이드 실리카/PMMA의 함량비 등의 반응조건에 따라 콜로이드 실리카/PMMA 졸을 합성하였다. 이러한 졸을 PET 필름에 바코팅시키고, 열경화 시켜 하드코팅막을 제조하여 물리적 화학적 특성을 조사하였다. PMMA에 비해서 하이브리드 형태에서 코팅 막의 연필경도와 기재와의 부착력이 우수하였다.

• 한국표면공학회지
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• 제47권1호
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• pp.1-6
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• 2014

The copper deposit on steel plate was prepared by pyrophosphate copper plating solution made with variation of inorganic additive. $NH_4OH$ and $NH_4NO_3$ were used as inorganic additives. The copper layer characteristics - tensile strength, crystallite size and crystal orientation - were evaluated by X-ray diffraction and Universal Test Machine. The presence of ammonium nitrate results in reduction of average roughness value from $0.08{\mu}m$ to $0.03{\mu}m$. In pyrophosphate copper plating solution without Inorganic additive, tensile strength of electrodeposit copper foil was reduced from 600 MPa to 180 MPa after 7 days aging. However, when adding ammonium nitrate, there was almost no change of tensile strength, intensity of crystal orientation - (111), (200) and (220) - and crystallite size (2~30 nm).

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 C
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• pp.1352-1354
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• 1997

Transparent conductive thin films have found many application in many active and passive electronic and opto-electronic devices as like flat Panel display electrode and window heat mirror, etc. Low resistivity and high transmittance of this films can be obtained by controlling deposition parameters, which are oxygen partial Pressure, substrate temperature and dopant concentration. In this study, We prepared non-stoichiometric and Sb-doped thin films of tin dioxide by reactive DC magnetron sputtering technology. The lowest resistivity of about $3.0{\times}10^{-3}\;{\Omega}cm$ and 80% transmittance in the visible light region have heed obtained at optimal deposition condition.

• 반도체디스플레이기술학회지
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• 제19권1호
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• pp.93-96
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• 2020

Polyimide thin film was prepared by annealing the polyamic acid that was synthesized through co-deposition of diamine and dianhydride. The polyamic acid and polyimide thin film were characterized with FT-IR and HR FE-SEM. The average roughness of the film surface, evaluated with AFM, were 0.385 nm and 0.299 nm after co-deposition, and annealing at 120 ℃ respectively. OLED was passivated with the polyimide layer of 200 nm thickness. While the inorganic passivation layer enhances the WVTR of OLED, the organic passivation layer gives flexibility to the OLED. The in-situ passivation of OLED with organic thin film layer provides the leading technique to develop flexible OLED Display.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1418-1420
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• 1996

In this paper, structural properties of CdTe thin films and photovoltaic properties of thin film CdS/CdTe solar ceIl prepared by thermal vacuum evaporation were studied. Structural variation with $CdCl_2/heat$ treatment are assessed using x-ray diffraction and scanning electron microscopy. The crystal structure of CdTe films was zincblend type with preferential orientation of the (111) plane parallel to the substrate. The $CdCl_2$ treatment appears to increase the grain size of polycrystalline CdTe thin film. It was found that CdS/CdTe solar cell characteristics were improved by the heat treatment with $CdCl_2$. The conversion efficiency, however, decreased when heat treatment temperature was too high.

• 접착 및 계면
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• 제14권1호
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• pp.28-35
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• 2013

본 연구에서는 표면처리된 Ga-doped ZnO (GZO)를 사용해서 태양열 차단 코팅제를 제조하였으며, 표면처리 화합물의 종류와 처리조건에 따른 입자의 분산성, 가시광선투과율, 자외선차단율, 적외선차단율, 단열특성 등에 대해서 고찰하였다. IPA나 아크릴 바인더를 사용했을 때에는 무기산화물 입자의 분산특성이 낮았으나, 무기산화물 입자를 우레탄(우레아)기와 아크릴기 그리고 실리카를 포함하는 하이브리드 화합물로 표면처리한 경우에는 입자의 분산성이 향상되어 침전되는 입자가 거의 발생되지 않았고 가시광선 투과율과 헤이즈(haze)가 크게 향상되었다. 그리고 실제 단열특성을 평가하기 위해서 단열평가 장치와 sunlamp를 사용하였으며, 평가결과 열차단 필름을 사용한 경우 PET 필름 자체만 사용했을 때와 비교해서 내부온도가 $4.8^{\circ}C$ 이상 낮은 것으로 확인되었다.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2011년도 추계학술발표회 논문집
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• pp.39-41
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• 2011

The recycling rate of recovered paper in Korea is the highest in the world, 92%, but remanufacturing yield is low due to the extremely poor quality of the paper. The poor quality, in turn, influences to the reject amount in deinking process. To increase the yield of old newspaper recycling process, hydrophobic degree of inorganic pigments of deinking stock must be reduced. To determine the hydrophobicity, Pitch Potential Deposit Tester (PDT) was newly designed and applied with respect to the SB latex property of various quality used in Korea; its hydrophobic degree according to Tg, gel content, charge and particle size of latex and optimum designing condition of SB latex. And below are the conclusions: 1. The reason of excessive reject from old newspaper deinking process for total amount of printed ink is loss of inorganic pigments. When lipase, a biochemical catalyst, was applied with the purpose of preventing inorganic pigments loss about more than 70% of total reject weight and promoting hydration of pulp for deinking, deinking process yield of pre flotation secondary stage increased remarkably without any changes of deinking efficiency. 2. Lipase improved deinking stock by cutting ester linkage on surface of hydrophobic materials to promote its hydration. From this, it reached the conclusion that hydration degree of stock exercises significant effect on flotation deinking process yield. 3. Inorganic alkali promotes hydration of deinking stock. But there have been needs for more fundamental measures other than inorganic alkali of promoting hydration for yield improvement. For this, this study intended to find out reasons of chemical properties change on surface of hydrophobic material by change of pH. 4. Pitch Deposit Test (PDT) was performed for understanding principle of why surface of coating flake from OMG is hydrophobic and why it becomes hydrophilic when pH of stock is alkaline. As a result of this test, it is determined that swelling property by change of pH of latex film, which were used as coating adhesive is the reason for hydrophobic change. 5. Hydrophilicity of coating flake increased with hydrophilic pigments. And as more of SB Latex adhesive was used and higher of calcium hardness of stock became, its hydrophilicity decreased. SB Latex adhesive film is reformed by mechanical friction. For having hydrophilicity under neutral pH, strong bruising action such as kneading is required. 6. Because swelling of adhesive film decreases as Tg of SB latex gets lower and mean diameter gets smaller, it shows hydrophobicity under neutral pH. This lowers hydrophilicity of coating flake, which leads to easy elimination with flotation reject on DIP process. Therefore, for improving future flotation yield, it is necessary to develop to use eco-friendly clean SB latex by raising Tg and increasing mean diameter for recycling, and as a result, to reduce excessive loss of coating flake as a reject from deinking process.

• 한국재료학회지
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• 제3권5호
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• pp.466-475
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• 1993

전면증착법에 의한 W공정에서 부착특성고양층으로 사용되는 TiN막에 대한 CVD W막의 부착특성을 인장법(pulling method)과 스크래치법(scratch method)을 사용하여 조사하고, 주사전자현미경과 반사도측정에 의한 표면거칠기측정, 응력측정 및 SIMS depth profiling 등에 의하여 그 원인을 분석하였다. 스퍼터링법으로 형성한 TiN막상에 바로 W막을 증착한 경우와 TiN막을 열처리한 후에 W막을 증착한 경우 간에 두 막간의 부착특성은 큰 차이를 보였다. 전자의 경우가 후자의 경우보다 부착특성이 더 우수한 것으로 나타났는데, 이것은 열처리하지 않은 TiN막이 열처리한 TiN막에 비해 표면이 더 거칠고, 응력수준이 더 낮으며, 열처리한 TiN막내에는 산소성분이 존재하는 반면, 열처리 하지 않은 TiN막내에는 산소성분이 거의 들어있지 않기 때문이다. 또한 TiN막 두께가 증가함에 따라 응력의 증가로 인하여 TiN막에 대한 W막의 부착강도가 저하되었다.

• Korean Chemical Engineering Research
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• 제50권3호
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• pp.574-581
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• 2012

OLED 소자는 수분과 산소의 침투에 의하여 유기물이 열화되어 수명이 감소하는 문제점을 가지고 있다. 이러한 문제점을 해결하기 위해서 OLED 소자의 봉지 기술이 최근 연구되고 있다. 현재 유리나 금속 용기를 이용하여 캡슐화 하는 방법이 널리 사용되고 있지만 이러한 방법으로는 유연한(flexible) 소자의 구현이 어렵기 때문에 이를 대체할 수 있는 기술들이 연구되고 있다. 박막 필름을 이용한 OLED의 봉지 기술은 유연한 디스플레이에 적용할 수 있는 기술로 사용될 수 있다. 본 연구에서는 치밀하고 결함이 없는 패시베이션(passivation) 박막을 형성하기 위해서 상온에서 증착이 가능한 PECVD를 이용한 무기 박막 증착 방법을 개발하고 증착 조건과 구조에 따른 OLED의 특성 변화를 분석하였다. 하나의 시스템에서 in-situ로 패시베이션할 수 있는 시스템 및 공정을 구축하였으며 단일 무기 박막의 WVTR(Water Vapor Transmission Rate) 값을 $1{\times}10^{-2}g/m^2{\cdot}day$ 이하로 확보하였고 제작된 박막을 패시베이션막으로 유연한 디스플레이에 적용할 수 있는 가능성을 제시하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.313-314
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• 2006

In this paper, the inorganic-organic thin film encapsulation layer was newly adopted to protect the organic layer from moisture and oxygen. Using the electron beam, Sputter and Spin-Coater system, the various kinds of inorganic and organic thin-films were deposited onto the Ethylene Terephthalate(PET) and their interface properties between organic and inorganic layer were investigated Results indicates that the SiON/PI/SiON/PI/PET barrier coatings have high potential for flexible organic light-emitting diode(OLED) application.