• 한국건설순환자원학회논문집
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• 제10권4호
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• pp.569-576
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• 2022

본 연구에서는 유·무기계 자기치유재료를 기반으로 박테리아 펠렛과 고상캡슐을 각각 혼입하여 사용한 하이브리드 자기치유 콘크리트의 치유성능을 조사하였다. 치유성능 평가방법으로 정수위 투수시험을 적용하였으며, 평가지표로 치유율과 등가균열폭에 의해 산출된 치유된 균열폭을 활용하였다. 정수위 투수시험 결과 초기 균열폭이 0.3 mm일 때 MC-BP와 MC-SC의 치유율은 MC와 비교하여 2.1~3.0 %pt 높았으며, 하이브리드 콘크리트의 치유된 균열폭은 0.017~0.018 mm 증가하였다. 결론적으로, 두 가지 치유소재를 함께 사용하더라도 자기치유 성능은 크게 향상되지 않은 것으로 나타났다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.154.2-154.2
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• 2016

In this work, we introduce a solution-processed CdS interlayer for use in inverted bulk heterojunction (BHJ) solar cells, and compare this material to a series of standard organic and inorganic cathode interlayers. Different combinations of solution-processed CdS, ZnO and conjugated polyelectrolyte (CPE) layers were compared as cathode interlayers on ITO substrates to construct inverted solar cells based on $PTB7:PC_{71}BM$ and a $P3HT:PC_{61}BM$ as photoactive layers. Introduction of a CdS interlayer significantly improved the power conversion efficiency (PCE) of inverted $PTB7:PC_{71}BM$ devices from 2.0% to 4.9%, however, this efficiency was still fairly low compared to benchmark ZnO or CPE interlayers due to a low open circuit voltage ($V_{OC}$), stemming from the deep conduction band energy of CdS. The $V_{OC}$ was greatly improved by introducing an interfacial dipole (CPE) layer on top of the CdS layer, yielding outstanding diode characteristics and a PCE of 6.8%. The best performing interlayer, however, was a single CPE layer alone, which yielded a $V_{OC}$ of 0.727 V, a FF of 63.2%, and a PCE of 7.89%. Using $P3HT:PC_{61}BM$ as an active layer, similar trends were observed. Solar cells without the cathode interlayer yielded a PCE of 0.46% with a poor $V_{OC}$ of 0.197 V and FF of 34.3%. In contrast, the use of hybrid ZnO/CPE layer as the cathode interlayer considerably improved the $V_{OC}$ of 0.599 V and FF of 53.3%, resulting the PCE of 2.99%. Our results indicate that the CdS layer yields excellent diode characteristics, however, performs slightly worse than benchmark ZnO and CPE layers in solar cell devices due to parasitic absorption below 550 nm. These results suggest that the hybrid inorganic/organic interlayer materials are promising candidates as cathode interlayers for high efficiency inverted solar cells through the modification of interface contacts.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 춘계학술대회 및 기술 세미나 논문집 디스플레이 광소자
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• pp.61-62
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• 2008

최근 유가 상승의 영향으로 많은 연구자들의 관심이 풍부하고 무한한 태양에너지의 활용에 많은 관심이 쏟아지고 있다. 하지만 현재 상용화된 실리콘 태양전지는 실리콘의 정제 및 제조 단가가 생산 비용에 많은 부분을 차지하여 시장진입에 어려움을 겪고 있다 또한 실리콘의 생산과 가공이 반도체나 디스플레이 분야에서도 반드시 필요하기 때문에 그에 따른 생산량이 전체 소비를 따라 가지 못하여 나타나는 공급 부족 현상도 상당 기간 지속 되었다. 이러한 상황에서 실리콘을 대처할만한 태양전지의 개발과 함께 휴대성이 뛰어난 태양전지의 개발이 많은 관심을 끌고 있다. 본 연구에서는 기존의 유기 태양전지에 CNT를 혼합한 유무기 하이브리드 태양전지를 제조하고 그에 따른 광학적 특성과 전기적 특성을 살펴보았다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2002년도 봄 학술발표회 논문집
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• pp.459-461
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• 2002

A new class of materials based on organic and inorganic species combined at a molecule level has obtained more attention recently[1]. HPA(heteropolyacid) shows unmatched applied perspective in terms of synthesis chemistry, analysis chemistry, biology, medicine and materials science[2]. As a potential photochemical material, the hybrid system of HPA and polymer has been investigated. However, the design and synthesis of heteropolyacid-based hybrids, which are at the forefront of the materials chemistry research, is still in its infancy. (omitted)

• 공업화학
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• 제21권6호
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• pp.670-675
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• 2010

나노실리카볼 입자를 합성하고 표면에 비닐기를 부여하는 합성 연구를 통해 다양한 크기로 조절이 된 유-무기하이브리드 입자인 비닐-나노실리카볼이 합성되었다. 다양한 크기의 비닐-나노실리카볼 입자를 상업적으로 적용되고 있는 아크릴-멜라민 클리어코트에 후첨시키고 경화시켰을 때, 클리어코트의 광택도 증가 및 유지 특성에 대해 연구하였다. 실리카볼 입자가 250 nm 정도인 경우 Matting effect에 의한 광택도 감소가 관측되었으나 20~30 nm로 작아지면 광택도 유지 효과가 약 7%까지 증가하였다. 나노실리카볼 대신 상업용 친수 실리카 Aerosil 200 (Hydrophilic fumed silica, 평균입도 12 nm, Degussa)을 사용하여 비닐- fumed 실리카 화합물을 합성하여 클리어코트에 적용하면 광택도 유지 효과가 약 2% 정도만 증가하였다.

• 대한치과기공학회지
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• 제29권1호
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• pp.121-131
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• 2007

A preparation process's conditions of aqueous sol which contains anatase-type nano titania particles with photocatalyic properties was established by using Yoldas process, so called, DCS(Destabilization of Colloidal Solution) process in this study. And crystal size change and phase transformation of titania particles in aqueous titania sol depending on reaction conditions was investigated by a light scattering method and XRD analysis of frozen dried powders, respectively. This sol with photo catalytic nano titania particles was used to the following hydrophilic hybrid coating film's fabrication and its properties was evaluated. Subsequently, for coating film using the above mentioned aqueous titania sol, non-aqueous titania sol was prepared without any chemical additives and its time stability according to aging time was investigate. By using the above mentioned aqueous titania sol and non-aqueous sol, a complex oxide coating sol for metal and ceramic substrate and a organic-inorganic hybrid coating sol for polymer substrate was prepared and it's hydrophilicity depending on UV irradiation conditions was evaluated. As a conclusions, the following results were obtained. (1)Aqueous titania sol The average particle size of titania in formed aqueous titania sol was distributed between 20$\sim$90nm range depending on reaction conditions. And the crystal phase of titania powders obtained by frozen drying method was changed from amorphous state to anatase and subsequently transformed to rutile crystal phase and it is attributed to concentration gradient in aqueous sol. (2)Non-aqueous titania sol Non-aqueous titania sol was prepared using methanol as a solvent and a little distilled water for hydrolysis and nitric acid as a catalyst were used. The obtained non-aqueous titania sol was stable at room temperature for 20 days. Additionally, non-aqueous titania sol with addition of chealating reagent such as acethylaceton and ethylene glycol prolonged the stability of sol by six months. (3)Complex sol and hybrid sol with super hydrophilicity The above mentioned aqueous titania sol as a main photocataylic component and non-aqueous titania sol as a binder for coating process was used to prepare a complex sol used for metal, ceramic and wood material substrate and also to prepare the organic-inorganic hybrid sol for polymer substrate such as polycarbonate and polyethylene, in which process APMS(3-Aminopropyltrimethoxysilane), GPTS(3-Glycidoxypropyl-trimethoxysilane) as a hydrophilic silane compound and HEMA(2-Hydroxyethyl methacrylate) as a forming network in hybrid coating film were used. The hybrid coating film such as prepared through this process showed a superhydrophilicity below 1$10^{\circ}$ depending on processing conditions and a pencil's hardness over 6 H.

• 마이크로전자및패키징학회지
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• 제25권4호
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• pp.53-58
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• 2018

집적회로 소자의 축소가 물리적 한계에 도달 한 이후 3D 패키징, 임베디드 패키징 및 팬 아웃 웨이퍼 레벨 패키징(FOWLP, fan-out wafer level packaging)과 같은 혁신적인 패키징 기술들이 활발히 연구되고 있다. 본 연구에서는 FOWLP의 다층 재배선(redistribution layer)에 사용하기 위한 유무기 하이브리드 유전체 소재의 공정을 평가하였다. 폴리이미드(PI) 또는 폴리파라페닐렌벤조비스옥사졸(PBO)과 같은 현 유기 유전체와 비교하여 폴리실세스키옥산(polysilsesquioxane, PSSQ)라고 불리는 유무기 하이브리드 유전체는 기계적, 열적 및 전기적 안정성을 향상시킬 수 있고, UV 노광을 통하여 경화 공정과 패턴 공정을 동시에 할 수 있는 장점이 있다. 폴리실세스키옥산 용액을 6 인치 Si 웨이퍼에 스핀 코팅한 후 pre-baking과 UV 노광 공정을 이용하여 패턴 및 경화를 진행하였다. 10분의 UV 노광 시간으로 경화와 $2{\mu}m$ 라인 패턴 형성이 동시에 진행됨을 확인하였고, 경화된 폴리실세스키옥산 유전체의 유전상수는 2.0에서 2.4 로 측정되었다. 폴리실세스키옥산 소재를 이용하여 고온 경화 공정없이 UV 노광 공정만으로 경화와 패턴을 할 수 있는 공정 가능성을 보였다.

• 한국포장학회지
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• 제24권3호
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• pp.141-148
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• 2018

Photo-oxidation is one of the main causes of food deterioration of great variety of foods, such as dairy products, nuts, meat products, and wine. It causes a loss of both nutritional value and sensorial quality of products and may even leads to the formation of toxic compounds. Active packaging for food and beverages has been investigated and developed with embedding light absorbers or blocking materials into the plastics. In recent years, several novel light barrier materials have been proposed as an alternative option for different applications. This article reviews the up-to-date technology in light absorber and blocking material with special emphasis on chemical compound and mechanism. Inorganic, organic, hybrid organic-inorganic, and natural light absorbers were scoped. The challenges and future perspectives of light barrier materials are also discussed.

• 한국전기전자재료학회논문지
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• 제18권12호
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• pp.1106-1110
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• 2005

We fabricated (110) silicon hard master by using anisotropic wet etching for embossing. The etching chemical for the silicon wafer was a TMAH $25\%$ solution. The anisotropic wet etching produces a smooth sidewall surface and the surface roughness of the fabricated master is about 3 nm. After spin coating an organic-inorganic sol-gel hybrid material on a silicon substrate, we employed hot embossing technique operated at a low pressure and temperature to form patterns on the silicon substrate by using the fabricated master. We successfully fabricated the multi-mode planar optical waveguides showing low propagation loss of 0.4 dB/cm. The surface roughness of embossed patterns was uniform for more than 10 times of the embossing processes with a single hydrophobic surface treatment of the silicon hard master.

• KIEE International Transactions on Electrophysics and Applications
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• 제4C권1호
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• pp.26-30
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• 2004

Orientation control of a polyoxometalate (POM) nanoparticle in its two-dimensional arrangement was attempted by Langmuir-Blodgett (LB) technique. For their uniorientation, two carboxyl groups were introduced on one side of the POM particle, and hydrophobic long chains were attached by esterification with the carboxyl groups (C18-POM). The C18-POM layer spread on water surface showed stability against surface pressure up to 60 mN/m. The pattern of the C18-POM isotherm was quite different from stearyl alcohol (C18-OH), while the POM itself did not show any development of surface pressure on water surface. The AFM images of C18-POM LB films showed some microcrystalline structures that were noticed as dot structures by Brewster angle microscopy. The microimages for C18-POM did not completely spread out as a monolayer on the water surface. The XPS spectra indicated the presence of POM structures and stearyl ester bonds formed from about 65% of the total carboxyls. The XRD spectra showed that the unioriented POMs were not positioned with the same lattice distance but rather in a wavy surface state.