• Bulletin of the Korean Chemical Society
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• 제31권11호
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• pp.3118-3122
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• 2010

The water soluble redox polymer, poly(N-vinylimidazole) complexed with Os(4,4'-dichloro-2,2'-bipyridine)$_2Cl]^+$ (PVI-[Os(dCl-bpy)$_2Cl]^+$), was electrodeposited on the surface of a glassy carbon electrode by applying cycles of alternating square wave potentials between 0.2 V (2 s) and 0.7 V (2 s) to the electrode in a solution containing the redox polymer. The coordinating anionic ligand, $Cl^-$ of the osmium complex, became labile in the reduced state of the complex and was substituted by the imidazole of the PVI chain. The ligand substitution reactions resulted in crosslinking between the PVI chains, which made the redox polymer water insoluble and caused it to be deposited on the electrode surface. The deposited film was still electrically conducting and the continuous electrodeposition of the redox polymer was possible. When cycles of square wave potentials were applied to the electrode in a solution of bilirubin oxidase and the redox polymer, the enzyme was co-electrodeposited with the redox polymer, because the enzymes could be bound to the metal complexes through the ligand exchange reactions. The electrode with the film of the PVI-[Os(dCl-bpy)$_2Cl]^+$ redox polymer and the co-electrodeposited bilirubin oxidase was employed for the reduction of $O_2$ and a large increase of the currents was observed due to the electrocatalytic $O_2$ reduction with a half wave potential at 0.42 V vs. Ag/AgCl.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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• pp.522-522
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• 2013

Plasma can be used to various applications such as sterilization, inactivation/removal of microorganisms, wound healing, tooth bleaching, cancer treatment, surface modification and plasma polymerization. In this research, we studied the effect of plasma irradiation on the structural, optical, and biological properties of the polymer films. Several polymers were synthesized and then deposited on the glass substrates. The polymer films were treated by oxygen and nitrogen plasmas. Plasma-treated films were investigated by contact angle, infrared absorption spectroscopy, cathodoluminescence spectroscopy, and scanning electron microscopy. Functional materials were prepared on plasma-treated surface, and their performances were investigated using various techniques. Next, we discuss relationship between the performance of functional materials and the structural properties of plasma-treated polymer films.

• 한국진공학회지
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• 제7권3호
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• pp.221-228
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• 1998

금속과 고분자 사이에 접착력을 향상시키기 위하여 이온 보조 반응법을 이용하여 고분자의 표면을 친수성으로 처리하였다. 이온 보조 반응법은 기존의 이온빔을 이용한 고분 자 개질 방법과는 달리 이온조사시 시료 표면에 반응성 가스를 흘려줌으로써 반응성 가스와 고분자 표면에 반응이 일어나게 하여 새로운 기능성 그룹을 형성하는 방법이다. 이온보조 반응법에서는 이온의 양은 $5\times 10^{14}$에서 $1\times 10^{17}\textrm{ions/cm}^2$까지 변화시켰고 반응성 가스의 양은 0에서 8sccm까지 변화시켰으며 이온의 에너지는 0.3keV에서 1.2keV까지 변화시켰다. 이온 보조 반응법을 이용하여 처리한 고분자의 경우 접촉각은 단순히 Ar+이온만을 이용하여 처 리한 경우 $40^{\circ}$근처의 값을 나타내었다. 그러나, 반응성 가스인 산소를 표면에 주입하여 주 었을 경우 접촉각은 20도 미만의 값을 나타내었다. 그리고 이때의 표면에너지는 ~ 70dyne/cm2까지 증가하였다. 그러나 테프론(polytetraflouroethylene: PTFE)의 경우 이온의 양이 증가하면 원래의 접촉각 보다도 큰 값을 나타내었다. 이렇게 처리된 고분자 위에 금속 을 증착 시켰을 때 금속과 고분자사이에 접착력을 조사하여 본 결과 처리하지 않은 시료의 경우 증착한 박막이 벗겨져 나가는데 반하여 이온 보조 반응법에 의하여 처리된 고분자 표 면에 증착된 금속막은 떨어져 나가지 않음을 관찰 할 수 있었다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.303.1-303.1
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• 2016

Polymer-like amorphous carbon films were deposited on polyethylene naphthalate (PEN) substrate by plasma-enhanced chemical vapor deposition (PECVD) and their water vapor transmission rates (WVTR) were tested. propane was used as precursors. To make a polymer-like amorphous carbon film the deposition rate, surface roughness, light transmittance, and WVTR of the films were characterized as a function of the precursor feed ratio and plasma power. The water vapor transmission rates of bare PEN film and single layer PAC on PEN substrate were 6.95 g/m2/day and 0.3 g/m2/day, respectively. The superior property the water vapor permeability of thin layers of PAC was attributed to uniform coverage and good adhesion between PAC film and PEN substrate.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제37회 하계학술대회 초록집
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• pp.256-256
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• 2009

• 한국표면공학회지
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• 제52권2호
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• pp.84-89
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• 2019

We fabricated durable anti-reflective(AR) layer with silica globular coating on polymer by two steps. Firstly, nano-protrusions of polymer were formed by plasma etching known as R.I.E(reactive ion etching) process. Secondly, silica globular coating was deposited on polymer nano-protrusions for mechanically protective and optically enhancing AR layers by RF magnetron sputter. And then durable antireflective polymers were synthesized adjusting plasma power and time, working pressures of RIE and RF sputtering processes. Consequently, we acquired the average transmission (94.10%) in the visible spectral range 400-800 nm and the durability of AR layer was verified to sustain its transmission until 5,000 numbers by rubber test at a load of 500 gf.

• 한국전기전자재료학회논문지
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• 제34권1호
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• pp.16-20
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• 2021

In this study, we tried finding new materials to improve the stain resistance properties of polymer insulating materials. Using the filtered vacuum arc source (FVAS) with a graphite target source, DLC thin films were deposited on silicon and polymer insulator substrates depending on their thickness to confirm the surface properties, physical properties, and structural properties of the thin films. Subsequently, the possibility of using a DLC thin film as a protective coating material for polymer insulators was confirmed. DLC thin films manufactured in accordance with the thickness of various thin films exhibited a very smooth and uniform surface. As the thin film thickness increased, the surface roughness value decreased and the contact angle value increased. In addition, the elastic modulus and hardness of the DLC thin film slightly increased, and the maximum values of elastic modulus and hardness were 214.5 GPa and 19.8 GPa, respectively. In addition, the DLC thin film showed a very low leakage current value, thereby exhibiting electrical insulation properties.

• 한국표면공학회지
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• 제29권6호
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• pp.678-682
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• 1996

The plasma-deposited polymer thin films at platinum surface were investigated as materials blocking access of chloride ions to the platinum surface and preventing their interference with the Nernstian responce of platinum. In the presence of chloride ions, the pH response of a naked platinum was remarkably affected. By comparison of pH responses of coated and uncoated platinum-wire electrodes immersed in solutions with chloride ions, it was found that toluene and ethylbenzene plasma films could improve the pH response of platinum. The pH response of coated platinum electrodes may be explained by the ability of protons, by virtue of their small size, to move through the polymer matrix to the platinum surface.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.26-26
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• 2010

Cadmium sulfide (CdS) thin film for flexible optical device applications were prepared at $H_2(Ar+H_2)$ flow ratios on polyethersulfon(PES) flexible polymer substrates at room temperature by radio frequency magnetron sputtering technique. The CdS thin films deposited at room temperature showed a (002) preferred orientation and the smooth surface morphologies. Films deposited at a hydrogen flow ratio of 25% exhibited a photo- and dark-sheet resistance of about 50 and $2.7{\times}10^5{\Omega}$/square, respectively. From the result of the bending test, CdS films exhibit a strong adhesion with the PES polymer substrates and the $Al_2O_3$ passivation layer deposited on the CdS films only shows an increase of the resistance of 8.4% after exposure for 120 h in air atmosphere.

• 폴리머
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• 제37권3호
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• pp.373-378
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• 2013

폴리카보네이트(PC) 필름을 유연기판으로 사용하기 위해서는 $SiO_x$ 증착에 의한 베리어 특성 개선이 필요하며 이때 베리어 층과 PC 계면 접착력이 매우 중요하다. 본 연구에서는 언더 코팅, UV/$O_3$ 및 저온 플라즈마와 같은 다양한 표면 처리 방법에 의하여 PC 필름 표면을 개질하여 표면의 물리적 화학적 변화가 증착된 베리어 층 계면 접착력에 미치는 영향을 살펴보았다. 표면 처리 전의 PC 필름은 표면 거칠기 및 표면 에너지가 매우 낮아 $SiO_x$ 베리어 층과의 접착력이 현저히 떨어짐을 알 수 있었다. PC 필름을 저온 플라즈마로 표면 처리한 결과, 표면의 거칠기 증가와 극성 관능기 생성에 의하여 극성 표면 에너지가 향상되는 반면 UV/$O_3$ 처리의 경우, 표면 거칠기 변화 없이 표면에 생성된 극성 관능기에 의해 극성 표면 에너지가 증가됨을 알 수 있었다. 이러한 표면의 변화는 베리어층과 PC 기판의 계면 접착력 증가에 기여함을 알 수 있었다. 표면 처리 방법으로 언더 코팅을 사용하는 경우 표면에 에너지를 가하지 않아도 코팅제의 아크릴산과 $SiO_x$의 접착력 향상에 의하여 PC 필름과의 계면 접착력이 증가되며 유무기 하이브리드 다층 구조에 의한 베리어 특성 개선이 함께 일어남을 알 수 있었다.