• Title/Summary/Keyword: Organic substrates

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Preparation of UV-curable Ozone Resistance Coating Solutions using Fluoromonomer (불소 단량체를 이용한 자외선 경화형 내 오존성 코팅 막 제조)

  • Lee, Chang Ho;Lee, Sang Goo;Kim, Sung Rae;Lee, Jong Dae
    • Korean Chemical Engineering Research
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    • v.50 no.3
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    • pp.421-426
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    • 2012
  • The effect of synthesis conditions such as various organic material and composition of organic-inorganic material in ozone resistance and surface characteristic of ultraviolet cured organic-inorganic hybrid coating film has been investigated. Organic-inorganic hybrid coating solution was prepared using tetraethoxysilane (TEOS), silane coupling agent methacryloyloxypropyltrimethoxysilane (MPTMS), 2,2,2-trifluoroethylmethacrylate, and various organic materials with acrylate group, bar-coated on substrates using applicator and densified by UV-curing. It was found that ozone resistance and surface hardness of the coating film was increased with contents of TEOS. It was also found that ozone resistance of coating film was increased with contents of 2,2,2-trifluoroethylmethacrylate. On the other hand, surface hardness was decreased with increase of 2,2,2-trifluoroethylmethacrylate. In addition, Surface hardness of coating film was increased with the addition of aliphatic urethane acrylate. It was also found that the transmittance of coating films was not influenced by content of TEOS and 2,2,2-trifluoroethylmethacrylate. In addition, the coating film exhibited high transmittance of above 90%.

Organic Memory Device Using Self-Assembled Monolayer of Nanoparticles (나노입자 자기조립 단일층을 이용한 유기메모리 소자)

  • Jung, Hunsang;Oh, Sewook;Kim, Yejin;Kim, Minkeun;Lee, Hyun Ho
    • Applied Chemistry for Engineering
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    • v.23 no.6
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    • pp.515-520
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    • 2012
  • In this review, the fabrication of silicon based memory capacitor and organic memory thin film transistors (TFTs) was discussed for their potential identification tag applications and biosensor applications. Metal or non-metal nanoparticles (NPs) could be capped with chemicals or biomolecules such as protein and oligo-DNA, and also be self-assembly monolayered on corresponding target biomolecules conjugated dielectric layers. The monolayered NPs were formed to be charging elements of a nano floating gate layer as forming organic memody deivces. In particular, the strong and selective binding events of the NPs through biomolecular interactions exhibited effective electrostatic phenomena in memory capacitors and TFTs formats. In addition, memory devices fabricated as organic thin film transistors (OTFTs) have been intensively introduced to facilitate organic electronics era on flexible substrates. The memory OTFTs could be applicable eventually to the development of new conceptual devices.

ALD-based Functional Bragg Reflector Structure to Block Harmful Ultraviolet Rays that Affect the Reliability of Organic Devices (유기소자의 신뢰성에 영향을 주는 유해 자외선을 차단하기 위한 ALD기반 기능성 브래그반사경 구조)

  • Hyeun Woo Kim;Hyeong Jun Lee;Seungmi Jang;Hyeongjun Yun;Dokyun Lee;Yongmin Lee;Sangyeon Park;Jihoon Jung;Seokjun Lim;Jeong Hyun Kwon
    • Journal of the Semiconductor & Display Technology
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    • v.22 no.4
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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.

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Synthesis and Structural Properties of YBa2Cu3O7-x Films/ZnO Nanorods on SrTiO3 Substrates

  • Jin, Zhenlan;Park, C.I.;Song, K.J.;Han, S.W.
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.08a
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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.

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LTCC기판상에 성장시킨 PZT박막의 열처리 특성연구

  • Lee, Gyeong-Cheon;Hwang, Hyeon-Seok;U, Hyeong-Gwan;Lee, Tae-Yong;Heo, Won-Yeong;Sim, Deung;Song, Jun-Tae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.11a
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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).

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Electrical Conductivity of a $TiO_2$ Thin Film Deposited on $Al_2O_3$ Substrates by CVD

  • Hwang, Cheol-Seong;Kim, Hyeong-Joon
    • The Korean Journal of Ceramics
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    • v.1 no.1
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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.

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혐기성 메탄 발효를 이용한 다양한 유기성 폐기물의 분해 특성

  • Kim, Jung-Gon;Jo, Geon-Hyeong;Jeong, Hyo-Gi;Jeon, Yeong-Nam;Kim, Si-Uk
    • 한국생물공학회:학술대회논문집
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    • 2003.04a
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    • pp.374-377
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    • 2003
  • The purpose of this study was to investigate the characteristics of anaerobic methane fermentation using several organic wastes. The substrates used in this study were food wastes, vegetable wastes, and cow manure. The substrates were mixed with inocula (mixed methanogenic fluid) at a ratio of 1:1, and several parameters such as TS, VS, sCOD, and biogas production have been monitored. Anaerobic degradation of food wastes were occurred in the intial stage of cultivation, whereas that of vegetable wastes were occurred in the late stage. However, in case of cow manure, the degradation was occurred two times both in the intial and the late stage of reaction.

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Ga doped ZnO Thin Films for Gas Sensor Application (Ga이 첨가된 ZnO 박막의 가스센서로의 응용 연구)

  • Hwang, Hyun-Suk;Yeo, Dong-Hun;Kim, Jong-Hee;Song, Joon-Tae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.6
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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.

Optimization of Binder Burnout for Reaction Bonded Si3N4 Substrate Fabrication by Tape Casting Method

  • Park, Ji Sook;Lee, Hwa Jun;Ryu, Sung Soo;Lee, Sung Min;Hwang, Hae Jin;Han, Yoon Soo
    • Journal of the Korean Ceramic Society
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    • v.52 no.6
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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.

Frequency response characteristics of PZT pressure sensor using three dimensional LTCC substrates (3차원 LTCC 기판을 이용한 PZT 압력센서의 주파수 응답 특성)

  • Hur, Won-Young;Lee, Kyung-Chun;Hwang, Hyun-Suk;Lee, Tae-Yong;Song, Joon-Tae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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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.

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