• Korean Chemical Engineering Research
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• 제50권3호
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• pp.421-426
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• 2012

불소계 아크릴레이트 2,2,2-trifluoroethylmethacrylate을 사용한 자외선 경화형 유-무기 하이브리드 코팅 막에 있어서 무기물 및 사용되는 유기 단량체의 종류 및 조성이 내 오존성 및 표면 특성에 미치는 영향에 대해 연구하였다. 코팅액은 금속 알콕사이드인 tetraethoxysilane(TEOS)와 실란 커플링제인 methacryloyloxypropyltrimethoxysilane(MPTMS)로 구성된 유-무기 혼성 용액에 2,2,2-trifluoroethylmethacrylate와 자외선 경화를 위한 유기물을 첨가하여 제조되었다. 코팅막은 코팅액을 기재위에 바 코팅 한 후 자외선 경화를 통해 제조되었다. 제조된 코팅 막의 내 오존성은 TEOS의 함량이 증가할수록 내 오존성과 표면경도는 향상되었다. 또한, 불소 함량이 증가할수록 내 오존성은 향상되었지만 표면 경도는 다소 떨어졌다. 우레탄 아크릴레이트를 첨가한 코팅 막은 높은 연필경도를 나타내었다. 코팅 막의 투과도는 TEOS와 2,2,2-trifluoroethylmethacrylate의 함량에 큰 영향을 받지 않았다. 더욱이, 코팅 막은 90% 이상의 높은 투과도를 나타내었다.

• 공업화학
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• 제23권6호
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• pp.515-520
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• 2012

이 총설에서는 개별인식 태그와 바이오센서 등에 사용가능성이 높은 실리콘 기반의 캐패시터와 유기 박막트랜지스터 소자의 제작과 차이점이 논하여 진다. 금속이나 혹은 비금속의 나노입자는 화학물질이나 혹은 바이오분자, 즉, 단백질과 올리고 DNA 등에 표면이 싸여질 수 있으며, 상응하는 목표 바이오분자가 결합되어져 있는 절연체에 자기조립 단일층을 형성할 수 있다. 단일층으로 형성된 나노입자는 정전하 기본단위로서 유기 메모리 소자의 나노 플로팅 게이트로서 역할을 하는 것이다. 특히, 바이오분자의 선택적이고 강한 결합 메카니즘을 통하여도, 메모리 캐패시터나 유기 메모리 박막트랜지스터가 성공적으로 시연되었다. 더불어, 이러한 유기 메모리 소자는 차후 유연기판의 유기전자소자 영역의 발전을 촉진할 것으로 기대된다. 또한, 유기 메모리 박막트랜지스터는 앞으로 새로운 개념의 소자로의 적용이 가능하다.

• 반도체디스플레이기술학회지
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• 제22권4호
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• pp.103-107
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• 2023

To solve the reliability problem of organic devices that are often used outdoors, multifunctional gas barriers that block reactive gases such as moisture and oxygen and reflect harmful light such as ultraviolet rays are needed. In this study, ALD nanolaminate-based optically functional n-DBR was developed to overcome the poor gas permeability of polymer substrates and protect organic devices from harmful light. n-DBR not only achieved a WVTR of 8.76 × 10^-6 g·m^-2·day^-1, but also showed a visible light transmittance of 94.3% and an ultraviolet ray blocking ability of 2.67%. In particular, n-DBR based on a nanolaminate structure maintained its permeability characteristics even in a high temperature and high humidity environment despite being used as a layer of Al₂O₃. This functional barrier Structure can not only be used as a functional encapsulation barrier for the reliability of organic devices, but can also be used as a tinting film for vehicles.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.169-169
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• 2012

The high-temperature superconductor YBa2Cu3O7-x (YBCO) have attached attentions because of a high superconducting transition temperature, low surface resistance, high superconducting critical current density (Jc), and superior superconducting capability under magnetic field. Moreover, the Jc of YBCO superconductors can be enhanced by adding impurities to the YBCO films for vortex-pinning. Understanding and controlling pinning centers are key factors to realize high Jc superconductors. We synthesized vertically-aligned ZnO nanorods on SrTiO3 (STO) substrates by catalyst-free metal-organic chemical vapor deposition (MOCVD), and subsequently, deposited YBCO films on the ZnO nanorods/STO templates using pulsed laser deposition (PLD). The various techniques were used to analyze the structural and interfacial properties of the YBCO/ZnO nanorods/STO hybrid structures. SEM, TEM, and XRD measurements demonstrated that YBCO films on ZnO nanorods/STO were well crystallized with the (001) orientation. EXAFS measurements from YBCO/ZnO nanorods/STO at Cu K edge demonstrated that the local structural properties around Cu atoms in YBCO were quite similar to those of YBCO/STO.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 추계학술대회 논문집
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• pp.117-117
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• 2009

Recently, low temperature co-fired ceramic (LTCC) technology has gained a remarkable application potential in sensors, actuators and microsystems fields. In this study, we investigated the effects of annealing treatment on the electrical properties of $Pb(ZrTi)O_3$ (PZT) thin films deposited on LTCC substrate. The LTCC substrates with thickness of 400 ${\mu}m$ were fabricated by laminating 12 green tapes which consist of alumina and glass particle in an organic binder. The PZT thin films were deposited on Au/LTCC substrates by RF magnetron sputtering method. Then, the change of the crystallization of the films was investigated under various annealing temperatures. The results showed that the crystallization of the films were enhanced as increasing annealing temperatures. The film, annealed at $700^{\circ}C$, 3min, was well crystallized in the ferovskite structure. The structural variation of the films were analyzed by using X-Ray diffraction (XRD) and field emmision scanning electron microscopy (FESEM).

• The Korean Journal of Ceramics
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• 제1권1호
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• pp.21-28
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• 1995

Electrical conductivity of $TiO_2$ thin films, deposited on $Al_2O_3$ substrates by metal organic chemical vapor deposition (MOCVD), was measured by four-point probe method in a temperature range from $800^{\circ}C$ to $1025^{\circ}C$ and an oxygen partial pressure range from $2.7{\times}10^{-5}$ atm to 1 atm. In the low oxygen partial pressure region n-type conduction was dominant, but in the high oxygen partial pressure region p-type conduction behavior appeared due to substitution of Ti ions by Al ions, which were diffused from the substrate during post deposition annealing process. Electrical conductivity of the film decreases in the n-type region and increases in the p-type region as the oxygen partial pressure increases. The transition points, which show the minimum conductivity, shifted to the higher oxygen partial pressure region as the measuring temperature increased, but it shifted to lower oxygen partial pressure region with an increase in the post annealing temperature. The results were also discussed with the possible defect models.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2003년도 생물공학의 동향(XII)
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• pp.374-377
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• 2003

본 연구는 각종 유기성 폐기물의 혐기소화시 혐기성 분해 특성에 대해 알아보고자 하였다. 실험에 적용된 유기성 폐기물의 종류는 음식폐기물, 축산폐기물, 농산부산물 이었으며 기질과 접종액을 1:1로 혼합하여 회분식으로 실험을 수행하였고, 이때 발효조내의 TS, VS, sCOD 변화 및 가스발생량을 측정하였다. 음식폐기물의 경우 실험초기에 혐기성 분해가 일어났으며, 농산부산물의 경우 실험 종반부에 혐기성 분해가 일어났다. 반면 축산폐기물의 경우 실험초기에 한차례 혐기성 분해가 이루어지고 종반부에서 다시 혐기성 분해가 이루어짐을 알 수 있었다.

• 한국전기전자재료학회논문지
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• 제21권6호
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• pp.499-502
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• 2008

In this work, Ga-doped ZnO (GZO) thin films for gas sensor application were deposited on low temperature co-fired ceramics (LTCC) substrates, by RF magnetron sputtering method. The LTCC substrate is one of promising materials for this application since it has many advantages (e.g., low cost production, high manufacturing yields and easy realizing 3D structure etc.). The LTCC substrates with thickness of $400\;{\mu}m$ were fabricated by laminating 12 green tapes which consist of alumina and glass particle in an organic binder. The structural properties of the fabricated GZO thin film with thickness of 50 nm is analyzed by X-ray diffraction method (XRD) and field emission scanning electron microscope (FESEM). The film shows good adhesion to the substrate. The GZO gas sensors are tested by gas measurement system and show fast response and recovery characteristics to $NO_x$ gas that is 27.2 and 27.9 sec, recpectively.

• 한국세라믹학회지
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• 제52권6호
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• pp.435-440
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• 2015

It is a challenge from an industrial point of view to fabricate silicon nitride substrates with high thermal conductivity and good mechanical properties for power devices from high-purity Si scrap powder by means of thick film processes such as tape casting. We characterize the residual carbon and oxygen content after the binder burnout followed by nitridation as a function of the temperature in the temperature range of $300^{\circ}C-700^{\circ}C$ and the atmosphere in a green tape sample which consists of high-purity Si powder and polymer binders such as polyvinyl butyral and dioctyl phthalate. The optimum condition of binder burnout is suggested in terms of the binder removal temperature and atmosphere. If considering nitridation, the burnout of the organic binder in air compared to that in a nitrogen atmosphere could offer an advantage when fabricating reaction-bonded $Si_3N_4$ substrates for power devices to enable low carbon and oxygen contents in green tape samples.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.204-204
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• 2010

A development of device with reduced size and improved sensitivity is highly impotant Pb(Zr,Ti)$O_3$ thin films are widely used both to make actuator and sensor due to their high sensitivity and low cost. In this study, the feasibility of a piezoelectric presssure sensors based on hybrid low-temperaute co-fired ceramic (LTCC) technology were presented. The LTCC diaphragms with thickness of $400\;{\mu}m$ were fabricated by laminating 4 green tapes which consist of alumina and glass particle in an organic binder. PZT thin films were successfully prepared on between top and bottom Au electrode with LTCC substrates using RF magnetron sputtering. In addition, The frequency response characteristics of the sensor under varing pressure has been analysed. by Network Analyser (HP-8722D). A frequency shift range has been obseved from 1.7GHz to 1.8GHz with a good linearity for applied pressure from 0 psi up to 25 psi.