• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
• /
• 2002.02a
• /
• pp.149-152
• /
• 2002

SrZrO3 resistive oxide barriers on Ag sheathed Bi2223 tapes prepared by the sol-gel and dip coating method were evaluated with an aid of Taguchi method and orthogonal arrays to elucidate the effects of experimental parameters, such as ratio of starting solution, amount of additives, and heat treatment temperature and time on the properties of the thin films. Six experimental parameters were selected and then Ll8(21x37) orthogonal arrays were constructed. Finally, SEM and XRD results were related to signal to noise (S/N) ratio to evaluate the optimized experimental condition.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1995.05a
• /
• pp.39-42
• /
• 1995

In this study, PLZT thin films prepared by Sol-Gel method were deposited on ITO glass by spin coating and cryatallized at 750$^{\circ}C$ for 5 min by RTA in oreder to investigate their electrical and optical properties. Although thin film experieneced narrowing their hysteresis loops with increasing La content, E$\sub$c/ and P.sub r/ were higher for thin film than for bulk materials. $\varepsilon$$\sub$r/ and optical transmittance increased with increasing La content.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1995.05a
• /
• pp.187-191
• /
• 1995

Thin film of the (Pb$\_$1-x/La.sub x/)(Zr$\_$0.25/Ti/Sub 0.48/) O$_3$(x=0~13[at%]) were prepared by Sol - Gel method. Multi-layer PLZT thin films were fabricated by spin-coating on Pt/Ti/SiO$_2$/Si substrate. The crystallinity and microstructure of the films were investigated with the sintering condition. At the sintering temperature of of 600[$^{\circ}C$], the perovskite phase was dominat. PLZT(11/52/48)thin films sintered at 600[$^{\circ}C$], 1[hr] had good dielectric constant (1236), dielectric loss (2.2[%]), remanent polarization (1.38[${\mu}$C/$\textrm{cm}^2$] and coercive field(16.86[ kV/cm]) respectively.

• Proceedings of the Optical Society of Korea Conference
• /
• 2002.07a
• /
• pp.134-135
• /
• 2002

Sm$^{2＋}$가 도핑된 불화물 결정은 실온에서 영구적 스펙트럼 홀 생성이 나타나며, 이러한 실온에서의 영구적 스펙트럼 홀 생성은 새로운 광 메모리의 개발에 매우 중요하므로 많은 관심을 받고 있다. 본 연구에서는 Sm$^{2＋}$가 도핑된 10Al$_2$O$_3$.90SiO$_2$ 박막을 제조하여 SEM 및 발광 스펙트럼(Photo-Luminescence; PL)을 측정함으로서 제조된 박막의 구조적, 광학적 특성을 조사하였다. (중략)

• Journal of the Korean institute of surface engineering
• /
• v.37 no.2
• /
• pp.76-79
• /
• 2004

Nickel chloride coated protein chip plate was developed by using a spin coating method. The ability of histidine tagged protein adsorption was investigated at various solvents. The surface of plate has a large aggregated nickel complex with high density in water. However, the surface of plate has a very small size of aggregated nickel complex with low density in isopropanol. The ability of protein adsorption decreased as increasing the size of alkyl chain in various alcohol solvents. The mechanism on the ability of protein adsorption at the plate surface is discussed.

• Journal of the Korean Ceramic Society
• /
• v.32 no.3
• /
• pp.349-358
• /
• 1995

The ceramic composite membrane was synthesized by thermal oxidation after evaporation of Al on the support prepared by slip casting process. Oxidation was performed at $700^{\circ}C$ and 80$0^{\circ}C$ under dry oxygen atmosphere. It was considered as optimum oxidation condition that the membrane showed a knudsen behaviro. A further oxidation resulted in an increase of gas permeability because top layer became densified. Then, a multi-layered composite membrane was synthesized through a sol-gel method, evaporation and thermal oxidation of Al coating processes. While the membrane was thermally stable up to 80$0^{\circ}C$, gas permeability was rapidly decreased even at a slight amount of deposition of Al.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2000.04b
• /
• pp.56-59
• /
• 2000

In this study, Ferroelectric $Pb(Zr_x,Ti_{1-x})O_3$(x=0.53) thin films were fabricated by the spin-coating on the Pt/Ti/$SiO_2$/Si substrate using the PZT metal alkoxide solutions with various excess Pb contents. Etching of PZT film was performed using planar inductively coupled Ar(20)$/Cl_2/BCl_3$ plasma. The etch rate of PZT film was 2450 ${\AA}/min$ at Ar(20)$/BCl_3$(80) gas mixing ratio and substrate temperature of $80^{\circ}C$. The leakage current densities of before etching and after etching PZT thin film were $6.25\times10^{-8}A/cm^2$, $8.74\times10^{-7}A/cm^2$ with electric field of 0.07MV/em, respectively.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2003.03a
• /
• pp.190-190
• /
• 2003

여러원소 (Sb, F 등)를 도핑한 SnO$_2$ 투명전도막은 여러 가지 훌륭한 특성으로 Solar cell, heat mirrors, gas sensors, liquid crystal displays, thick film resistor 등과 같이 넓은 범위에서 응용되고 있다. 본 연구에서는 Sb 도핑된 Tin Oxide films이 Sol-gel dip coating법에 의해 준비되었다. SnO$_2$:Sb 용액은 SnC1$_2$ 와 SbC1$_3$ Power를 알코올에 용해하여 Ethylene glycol 와 Citric acid를 첨가하여 합성하였다. 막의 상형성은 XRD와 SEM(Scanning electron microscope)에 의해서 분석되었으며, 특성분석은 투과율(UV/VIS Spectrophotometer)과 표면전기저항(four point probe)으로 분석되었다. SiO$_2$ barrier이 SnO$_2$:Sb 막의 특성에 미치는 영향을 확인하기 위하여 XPS(X-ray photoelectron spectroscopy) 분석이 적용되었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.05a
• /
• pp.366-369
• /
• 2003

High T$_{c}$ superconducting lines will be applied as key materials in the areas of power transmission line; magnetic levitation of vehicle; magnetic separation; magnetic energy storage and marine propulsion. A combination method of electrophoresis deposition and zone-melting for preparation of YBaCuO tape is proposed. The submicron particle powder of YBaCuO made by sol-gel method is used in the electrophoresis process. A 40~50${\mu}{\textrm}{m}$ thickness of YBaCuO film on Ag plate could be deposited in about three minutes. After deposition the film is rolled and heat treated in order to increase the density and the adhesion of the film to the Ag plate. Silver(Ag) and lead oxide(PbO) were added in the YBaCuO powder in order to reduce its melting point. The YBaCuO coating with controlled Ag and PbO contents was preliminarily zone-melted at about 945$^{\circ}C$.>.

• Journal of the Korean Graphic Arts Communication Society
• /
• v.14 no.1
• /
• pp.1-15
• /
• 1996

In this paper, the preparation of lead zirconium titanate(PZT) thin film by sol-gel processing was descried. Thin film coated with thickness of 4${\mu}{\textrm}{m}$ on the stainless steel substrates using the multiple spin-coating process. The crystalline phases of PZT powder and film were investigated by X-ray diffraction pattern and PZT thin film has perovskite structure over 600 C annealing temperature. Corona charging characteristics of the ferroelectric PZT thin film at 600 C were investigated by electrophotographic measurement. A difference in the charging characteristics between positive and negative corona charging was found. The charge acceptance depended in the polarity of corona and the poling of film. According to the D-E hysteresis measurment, PZT thin film can be poled by corona charging without use of top electrode. The remnant polarization in the PZT thin film is generally in the order of 48$\mu$C/$\textrm{cm}^2$. From this results, the ferroelectric PZT thin film will be possible to apply for the add-on type imaging formation.