• Journal of the Korean Applied Science and Technology
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• v.31 no.3
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• pp.352-358
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• 2014

We were investigated the stability through the electrochemical characteristics of saturated fatty acid(C12, C14, C16, C18) monolayer LB films by cyclic voltammetry. Saturated fatty acid monolayer LB films was deposited on the indium tin oxide(ITO) glass by the LB method. The electrochemical properties were measured by cyclic voltammetry with a three-electrode system in 0.1 N $NaClO_4$ solution. The measuring range was continuously oxidized to 1650 mV, with an initial potential of -1350 mV was reduced. Scanning rates of 50, 100, 150, 200, and 250 mV/s were set. As a result, LB monolayer films of saturated fatty acid were appeared on irreversible processes by the oxidation current from the cyclic voltammogram. Diffusion coefficient(D) of saturated fatty acid(C12, C14, C16, and C18) was calculated 22.231, 2.461, 7.114 and 2.371 ($cm^2s^{-1}{\times}10^{-4}$) in 0.1 N $NaClO_4$ solution, respectively.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.7 no.3
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• pp.34-40
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• 1993

전기전자산업에 유기분자집합체에 대한 전자 device적 기능을 갖게 하는 초전막형성 기술의 하나로서 LB막이 이용되게 된다. 10여년전에 만들어 대기중에 방치되었던 Langmuir Blodgett(LB) 초전막 시료에 대해서 MIM구조소자에 전하가 발생하는 특성을 검토하였다.그 결과 LB막이 무극성일 때는 상하부전극을 동일 금속으로 하면 전압이 발생하지 않고, 서로 다른 금속전극으로 할 때는 전압이 발생하였는데 양전극금속의 일함수값의 차가 클수록 발생전압이 높았고 LB막이 유극성일때는 동일 전극이라도 전압이 발생하였다.따라서 LB초전막의 MIM 소자에서 발생하는 전하는 단순한 화학작용에 의한 것이 아니고양전극 금속의 일함수와 극성에 관계가 있다고 생각된다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.05a
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• pp.61-62
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• 2006

본 연구에서는 대표적인 양친매성분자인 Arachidic acid를 이용하여 박막을 제작하였으며, 층수 변화에 따른 표면이미지와 전압-전류 특성을 측정하였다. Arachidic acid 는 포화지방산으로 ($CH_3(CH_2)_{18}$ COOH)의 구조를 가지며, 크기가 $27.5{\AA}$으로 $CH_3(CH_2)_{18}$의 소수기와 COOH의 친수기로 구성되어 있어, Langmuir-Blodgett (LB) Trough을 사용하여 박막제작과 분자제어가 쉽다. Chloroform을 용매로 하여 2 mmol/l의 농도를 조성하여 ${\pi}$-A 등온선을 통해 기체 상태, 액체 상태, 고체 상태를 관찰하였다. LB 막의 제작 및 평가에서 막의 안정성은 ${\pi}$-A 곡선, AFM(Atomic force microscopy) 등을 통하여 확인하였다. 또한 LB 막을 Metal/유기물 LB막/Metal 구조의 소자로 제작하여 전압-전류 특성을 측정하였다.

• Journal of the Korean Applied Science and Technology
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• v.30 no.4
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• pp.754-760
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• 2013

We investigated an electrochemical properties for Langmuir-Blodgett (LB) monolayer films of sphingomyelin(SP) and polyamic acid(PAA) mixture(1:1, 2:1 and 3:1 molar ratio). LB monolayer films of mixture was deposited by the LB method on the indium tin oxide(ITO) glass. The electrochemical properties measured by cyclic voltammetry with three-electrode system in 0.1N $KClO_4$ solution. As a result, LB monolayer films of SP and PAA mixture was appeared on irreversible process caused by the reduction current from the cyclic voltammogram. Diffusion coefficient(D) in the SP and PAA mixture was calculated $2.670{\times}10^{-5}$, $3.562{\times}10^{-5}$ and $1.005{\times}10^{-5}cm^2s^{-1}$ at 1:1, 2:1 and 3:1 molar ratio, respectively.

• Journal of the Korean Applied Science and Technology
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• v.30 no.1
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• pp.64-70
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• 2013

We investigated an electrochemical properties for Langmuir-Blodgett (LB) monolayer films of sphingomyelin and polyamic acid(1:1 molar ratio) mixture. LB monolayer films of mixture was deposited by the LB method on the indium tin oxide(ITO) glass. The electrochemical properties measured by cyclic voltammetry with three-electrode system in $KClO_4$ solution. The current of reduction and oxidation range was measured from 1650 mV to -1350 mV, continuously. The scan rates were 50, 100, 150, 200 and 250 mV/s, respectively. As a result, LB monolayer films of sphingomyelin and polyamic acid mixture was appeared on irreversible process caused by the reduction current from the cyclic voltammogram. Diffusion coefficient (D) in the sphingomyelin and polyamic acid mixture was calculated $2.67cm^2s^{-1}{\times}10^5$, $5.23cm^2s^{-1}{\times}10^6$ at 0.1 N and 0.2 N $KClO_4$ solutions, respectively.

• Polymer(Korea)
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• v.26 no.5
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• pp.634-643
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• 2002

Ultrathin film of polyamic acid having benzene and sulfonyloxyimide moieties was prepared using the Langmuir-Blodgett (LB) technique, and then photosensitive polyimide LB film was obtained by the thermal treatment of precursor polyamic acid multilayers at 200$\^{C}$ for 1 hr. The polyamic acid was synthesized by condensation polymerization under THF and pyridine cosolvent. All monomers and polymers were identified through elemental analysis, FT-IR and $^1$H-NMR spectroscopic measurements. The microarray patterning of photosensitive polyimide LB film on a gold substrate was generated with a deep UV lithography technique. The well-characterized monolayer of cytochrome c was immobilized on the microarray patterns using two different self-assembly processes. Physical and electrochemical properties of the self-assembled cytochrome c monolayer were investigated based on cyclic voltammetry and atomic force microscopy (AFM). Also, its application in bioelectronic device was examined.

• Journal of the Korean Applied Science and Technology
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• v.11 no.2
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• pp.151-155
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• 1994

Polyamic acid alkylamine (N, N-dimethylhexadecylamine)(PAAS)염을 합성하여 그 합성여부를 확인하였으며 PAAS염의 Langmuir막의 ${\pi}-A$ 등온선 및 표면 전위 특성 등을 조사 하였다. Langmuir-Blodgett법에 의하여 PAAS염의 LB막을 여러종류의 기관에 누적하였으며 누적여부를 자외선 흡수 스펙트럼 및 적외선 투과 스펙트럼을 이용하여 조사하였다. 그리고 PAAS LB막을 열처리에 의하여 이미드(imide)화시켜 폴리이미드 LB막을 제조하였으며 그 이미드화 여부를 자외선 및 적외선 스펙트럼을 이용하여 조사하였다.

• Electrical & Electronic Materials
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• v.10 no.6
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• pp.548-554
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• 1997

We fabricated the sample of ultra thin lipid membrane(L-$\alpha$-DLPC) by LB method. The $\pi$-A isotherm of the DLPC was measured at the air-water interface varying with the compressing speed and amounts of solutions for spreading. For the good property of lipid monolayer film, it was necessary to prepare at the lower speed of compressing, with an appropriate volume of solutions for spreading. Absorption, transmitance and intensity with the UV spectrophotometer were measured. The Z-type multilayers showed good characteristics better than Y-type. So we found building-up of structurally high quality LB films is essential to study properties of the films and to get reproducible data.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1990.10a
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• pp.74-77
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• 1990

In this paper, we study the electrical conduction mechanism in Langmuir-Boldgett(LB) ultra thin films. The LB device has a metal/Lb films/metal sandwich structure, where metal is electrode. In our experiments, the temperature does not depend on the current at below 0$^{\circ}C$. This phenomena show that the electrical conduction current is a tunnel current inherent to LB ultra thin films.

• Proceedings of the Korean Fiber Society Conference
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• 2001.04b
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• pp.351-354
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• 2001