• 전자공학회논문지 IE
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• 제43권4호
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• pp.99-104
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• 2006

전기 전자 소자를 제작하는 방법으로 Langmuir-Boldgett(LB)법이 많은 관심을 받고 있다. 수면위에 형성된 단분자막을 압축 또는 확장하면, 분자가 배향하는 과정에서 맥스웰 변위전류(MDC)가 흐른다. MDC는 전속밀도의 변화에 기인해서 흐르므로 MDC를 측정하는 것에 의해 분자의 동적 거동 관찰할 수 있다. 단분자막을 압축하는 속도와 분자면적은 서로 선형적인 관계를 갖고 있다. 본 연구에서는 압축속도를 30, 40, 50mm/min으로 달리하여 단분자막의 동적 거동을 관찰하였으며 LB법을 이용하여 Arachidic acid 단분자를 slide glass 위에 Y-type으로 9$\sim$21층의 다층막을 누적하여 Au/Arachidic acid/Al 소자를 제작하였다. 또한 Metal-Insulator-Metal(MIM) 소자의 I-V 특성을 측정하여 전극간의 거리가 커질수록 절연특성이 좋아짐을 확인하였다.

• 대한화학회지
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• 제37권3호
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• pp.302-308
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• 1993

Calcium-palmitate의 단분자막을 압전수정결정 위에 Langmuir-Blodgett(LB) 기법으로 적층시켜 수정판의 진동수 변화로부터 LB막의 적층수를 평가할 수 있었다. 바탕용액에 Ca$^{2+}C$ 이온을 포함하는 palmitic acid(PA) 단분자막으로부터 이전 및 적층된 LB막 물질을 적외선 분광분석을 한 결과 1704 cm$^{-1}C$에서 갈라진 흡수띠가 나타나는 것으로 보아 calcium palmitate가 형성되었음을 알 수 있었다. 1580cm$^{-1}C$과 1540cm$^{-1}C$의 두 흡수띠는 각각 calcium carboxylate기의 비대칭 신축진동과 carboxylate가 수화되어 대칭강하된 것으로 확인되었다$^1$. 이사실은 X-선 회절분석에 의해서도 확인되었다. 23$^{\circ}C$ 물 속에서 LB막의 팽윤거동을 LB막이 적층된 수정진동판의 진동수 변화로부터 관측되었다. Calcium palitate LB막은 충분히 팽윤이 되었으나 hexadecanol LB막은 거의 팽윤이 되지 않았다. Calcium palmitate LB막 팽창량은 무게비로 건조 LB막의 47${\%}$였으며 calcium palmitate 단위 분자당 7개의 물분자가 결합되었다. Calcium palmitate 건조 LB막의 화학적 구조는 [CH$_3$(CH$_2$)$_{14}$COO]$_2$Ca${\cdot}$XH$_2$O이고 수화수는 1 H$_2$O였다.

• 대한전기학회논문지
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• 제40권9호
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• pp.913-919
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• 1991

For an elementary study of the molecular electronic devices, in this study, N-alkylpyridinium(TCNQ) (1:1) and (1:2) complexed were synthesized. These complexes were verified by the UV, IR and the elemental analysis. Deposition of the LB films were verified by the reciprocal capacitance, UV absorbance and decresement area of Langmuir fims as functions of number of layers. The internal voltage of LB membrane devices fabricated with Y-type resides in 100-300mV. Finally, it seemed that self-polarization of LB membrance generates internal voltage.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 D
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• pp.1980-1982
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• 1999

Conductive Langmuir-Blodgett(LB) films have recently attracted much interest from the viewpoint of ultrathin film conductors at the molecular level. The result shows that the Maxwell-displacement-current (MDC) measuring technique is useful in the detection of phase-transitions over the entire range of molecule areas. In this parer, electrical properties of PBDG Langmuir(L) films were investigated using a displacement current measuring technique with pressure stimulation. Displacement current was generated When the Spread volume $150{\mu}{\ell}$ and compression velocity was about 30, 40, 50 mm/min. In the result, it is known that current is generated of higher current peek as compression velocity become faster.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 춘계종합학술대회
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• pp.556-558
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• 2007

최근에 분자 전자 소자로 사용되기에 적합한 많은 분자들이 많은 주목을 받고 있다. 또한 이러한 소자에 사용되는 초박막 물질들은 의용공학용 전자 소자에도 많이 사용되기도 한다. 분자 수준 스위치의 개발에 기초로 한 현재의 많은 시도들은 논리회로와 메모리 소자 등에 응용 될 수 있다. 본 연구에서는 eicosanoic acid 지질막을 이용하여 초박막 소자를 제작하고, 이의 전기적 특성을 측정하였다. 또한 측정된 결과를 통하여 본 연구에서의 분자 소자가 의용 소자로의 응용 가능을 확인하고자 하였다.

• 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.

• 공업화학
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• 제29권4호
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• pp.363-368
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• 2018

Polyoxometalates (POMs)는 뛰어난 특성과 전기 화학 응용 분야에 대한 많은 잠재력을 가지고 있다. POM은 매우 잘 녹는 성질 때문에 전기화학 소자에서 POM의 잠재력을 최대한 활용하기 위해서는 다양한 기능성 재료에 POM을 고정화하는 과정이 필수이다. 본 논문에서는 우리는 최근 개발된 고정화 방법인 나노 카본 및 전도성 고분자와 같은 전도성 나노 물질에 POM을 도입하는 기술들에 대해서 논하고자 한다. Langmuir-Blodgett 기술, 층별 자기 조립 및 전기화학 in-situ 중합을 사용하여 전도성 고분자 매트릭스 및 POM을 나노 카본으로 도입할 수 있는 다양한 고정화 전략을 소개한다. 또한 우리는 POM의 응용 분야인 물 산화용 전극 촉매, 리튬 이온 배터리, 슈퍼커패시터 및 전기화학적 바이오 센서 등의 다양한 전기 화학 응용 분야를 다룬다.

• 한국표면공학회지
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• 제28권1호
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• pp.34-45
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• 1995

An amphiphilic nitroxide radical(2,2'6,6'-tetramethyl-4-octadecyioxy-1-piperidinyloxyl, TEMOPO) or mixture of TEMOPO and arachidic acid(Icosanoic acid, AA), was spread on water surface by the Langmuir-Blodgett(LB) method and surface pressure-area curve was measured. Such monolayer films of TEMOPO were transferred onto surfaces of photo transferable tin oxide electrodes(PTTO) by the LB method under various surface pressure with the transfer ratio of larger than 0.95 at the surface pressure higher than 15mN/m. The electrochemical effect of functional nitroxy radical monolayer onto semi-conductive electrode to electrolyte have been investigated by using LB method. Cyclic voltammetry technique was used for the electrochemical behavior measurement of TEMOPO monolayer onto the PTTO in 0.18 mo1/$dm^3$ $H_2SO_4$ solutions. The shape of voltammograms was found to change from one electrode to another. The amount of charge for the oxidation and the re-reduction of the cation to TEMOPO were evaluated from graphical integration. The amounts of charge were always smaller than those predicted from the $\pi$-$\sigma$ curves though the transfer ratio was unity. The poor reproducibility of the cyclic voltammograms was improved by the mixing with AA. Structure and arrangement of monomolecular layer on water surface and electrode were studied. Characteristics of monolayer film applied for the mediation reaction was also discussed by electrochemical method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 추계학술대회 논문집 학회본부
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• pp.225-227
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• 1994

The second-order nonlinear optical effect, especially the second harmonic generation, in Langmuir-Blodgett(LB) films have get much attention over the past few years. For second harmonic generation(SHG) of the ultrathin organic films, the multilayer structure of the film should have the noncentrosymmetric arrangements of molecules. The Langmuir-Blodgett technique can result in the production of thin films of precisely controlled dimensions and structure. In this paper, n-octadecyl 4-(4'-nitrophenylazo)-1-naphthyl ether, ONNE(azohenzene derivative), was synthesized and the optical properties of ONNE was studied. Nonccntrosymmctric Z-type LB films of ONNE were prepared and SHG intensity of the film were measured. The structural characteristics of floating monolayer(L film) and LB film of ONNE were discussed with $\pi$-A isotherm. UV-visible absorption spectroscopy and spectroscopic ellipsometry. The polarized UV-visible absorption spectroscopy and SHO intensity suggest the molecular orientation in LB film.

• 한국응용과학기술학회지
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• 제19권2호
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• pp.73-78
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• 2002

The polyimide(PI) Langmuir-Blodgett(LB) ultra thin films were prepared by imidizing the PAAS LB films of PMDA and benzidine system with a thermal treatment at $250^{\circ}C$ for 30min, where the PAAS LB films were formed on substrates by using LB technique. The thicknesses of one layer of PAAS and PI LB film that deposited at the surface pressure of 27mN/m were 20.9 and 4A, respectively. At low electric field, ohmic conduction($I^{\propto}$ V) was observed and the calculated electrical conductivity was about $4.23{\times}10^{-15}{\sim}9.81{\times}10^{-15}S/cm$. The dielectric constant of LB film was about 7.0.