• 제목/요약/키워드: LB film

검색결과 299건 처리시간 0.024초

실리콘 웨이퍼 위에 제작된 DLPC 지질막의 전기적특성 (Elctrical Properties of DLPC Lipid Membrane Fabricated on the Silicon Wafer)

  • 이우선;김충원;이강현;정용호;김남오;김상용
    • 한국전기전자재료학회논문지
    • /
    • 제11권12호
    • /
    • pp.1115-1121
    • /
    • 1998
  • MLS capacitor with lipid ultra thin films were deposited by Langmuir-Blodgett (LB) method on the silicon wafer. The current versus voltage and capacitance versus voltage relationships are depend on the applied voltage, electrode area and electrode materials. LB films deposited were made of L-$\alhpa$-DLPC, the 1 layer’s thickness of 35${\AA}$ was measured by ellipsometer. And MLS capacitor with different electrode materials, the work function of these materials was investigated to increase the leakage current. The result indicated the lower leakage current and very high saturation value of capacitance was reached within 700-800 pF when the two electrode was Ag. And $\varepsilon$1, $\varepsilon$2 versus photon energy showed good film formation.

  • PDF

아조벤젠기를 가지는 지방산과 인지질의 혼합물에 대한 광이성화 현상 및 물성에 관한 연구 (A Study on the Photoisomerization and Physical Properties for Mixtures of Phospholipid and Fatty Acid containing Azobenzene)

  • 박근호;이수;변용진
    • 한국응용과학기술학회지
    • /
    • 제16권4호
    • /
    • pp.281-286
    • /
    • 1999
  • We carried out this subject to observe photoisomerization using 8A5H and phospholipid(DLPC) containing azobenzene group which has reversible to cis-trans by light irradiation. We investigated the photoisomerization and property of the monolayer film on quartz substrate prepared by the mixture of 8A5H and phospholipid deposited using Langmuir-Blodgett(LB) method. It was found that the absorption spectrum of the 8A5H and phospholipid LB monolayer was induced to photoisomerization by alternate light irradiation. And the absorbance of both the solution of mixtures of 8A5H-phospholipid and LB film was reversibly changed by the acid-base exposure and alternate temperatures.

(N-docosyl quinolinium)-TCNQ(1:2) 전하 이동 착물 Langmuir-Blodgett막의 전기적 특성 (Electrical Properties of (N-docosyl quinolinium)-TCNQ(1 :2) Charge Transfer Complex Langmuir-Blodgett Films)

  • 정순욱;정회걸
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 1999년도 추계학술대회 논문집
    • /
    • pp.143-146
    • /
    • 1999
  • In this study, Ultra-thin films of (N-ducosyl quinolinium)-TCNQ(1:2) complex were prepared on the hydrophilic substrate by Langmuir-Blodgett(LB) technique. By measure of UV-vis spectra and capacitance, deposition status was confirmed together with the thickness of natural oxidized aluminum film inside a device and dielectric constant of (N-docosyl quinolinium)-TCNQ(1:2) complex. The electrical properties of (N-docosyl 7uin7linium)-TCNQ(1:2) complex were investigated at room temperature. The conductivity of this film measured by the direction uf either vertical or horizontal axis is results in a quite different value.

  • PDF

Eicosanoic Acid LB 박막을 이용한 분자 전자 소자의 전기적 특성 연구 (Electrical Properties of Molecular Electronic Device Using Eicosanoic Acid LB Thin Film)

  • 이호식;천민우;박용필
    • 한국정보통신학회:학술대회논문집
    • /
    • 한국해양정보통신학회 2007년도 춘계종합학술대회
    • /
    • pp.556-558
    • /
    • 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.

  • PDF

$\pi$-A Isotherms and Electrical Properties of Polyamic acid Alkylamine salts(PAAS) Langmuir-Blodgett Films

  • Kim, Tae-Wan;Park, Jun-Su;Cho, Jong-Sun;Kang, Dou-Yol
    • E2M - 전기 전자와 첨단 소재
    • /
    • 제11권10호
    • /
    • pp.60-65
    • /
    • 1998
  • Deposition conditions, surface morphology, and electrical properties of polyamic acid alkylamine salts (PAAS) Langmuir-Blodgett(LB) films have been investigated through a study of surface pressure-area $\pi$-A isotherms, AFM (atomic force microscopy), and current-voltage characteristics. To obtain the optimum conditions of film deposition, the $\pi$-A isotherms were examined by varying temperature, barrier moving speed, dipping speed, spreading amount of solution etc. The Z-type LB films were made at the surface pressure of 5 mN m-1 and 25 mN m-1 for the AFM study; the former surface pressure forms the gas phase and the latter one forms the solid phase. The LB film made in the gas phase show domains with a size of about 200 A diameter and 70 A height. However, the LB films made in the solid phase show a very smooth surface with 2 A surface roughness. In the current-voltage characteristics measured along the perpendicular direction of the films, ohmic conduction has been observed below 105 V cm-1 and the calculated electrical conductivity is about 10-13 S cm-1. Nonohmic conduction has been observed above = 10-11 V cm and the conduction mechanism can be explained by the Schottky effect.

  • PDF

UV조사에 의한 메로시아닌 색소 LB막의 광반응 특성 (The Light Response Properties of Merocyanine Dye LB Film Using UV irradiation)

  • 강기호;김정명;신훈규;장정수;권영수
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2000년도 영호남학술대회 논문집
    • /
    • pp.47-50
    • /
    • 2000
  • The optical characteristics of merocyanine dyes have been investigated widely due to their possible application to the high efficiency photo-electric devices. The optical systems are mostly fabricated using vacuum evaporation, casting and Langmuir-Blodgett method and the arrangement and orientation of dye molecules is one of the most important factors in the study on the optical characteristics. In this study, we fabricated the molecular systems through the LB techniques and investigated the optical characteristics of merocyanine dye LB film using the oscillation characteristics of quartz crystal. It was quite interesting behavior that the resistance and frequency shift at the parallel resonance under the UV irradiation.

  • PDF

Polyimide(PI)LB막의 MIM구조 소자내에서의 switching전도특성 (Switching conduction characteristics of PI LB Film in MIM junctions)

  • 김태성;김현종
    • E2M - 전기 전자와 첨단 소재
    • /
    • 제8권2호
    • /
    • pp.176-183
    • /
    • 1995
  • The present work is concerned with the switching conduction characteristics of PI LB films in metal insulator metal sandwiches. By applying various DC voltage bias to MIM junctions, conduction characteristics of junctions can be changed between the high-voltage low-current(off) condition, the low-voltage high-current (on) condition and the medium(mid) condition. Switching conduction characteristics can be also observed in MIM junctions employing some aromatic compounds as insulators. Switching conduction characteristics is assumed to be owing to the existence of aromatic rings, space charge in films, impurities on metal-insulator interface, and difference in work functions of base and top electrodes metal. To study the conduction process of on, off, and mid conductions, we measured I-V, d$^{2}$V/d I$^{2}$-V characteristics of junctions with several different top electrodes under various temperatures. Small conductance changes of junctions can be measured by observing the second derivative, d$^{2}$V/dI$^{2}$, of I-V curve. A dynamical technique is used to get the second derivatives. That is, a finite modulation of the current is applied to the junctions and the second harmonic of the voltage is detected.

  • PDF

기능성 유기 LB단분자막의 전기화학적 연구 (Electrochemical Study of Functional Organic Monomolecular Film prepared by Langmuir-Blodgett Method)

  • 박수길;임기조;전일철;이주성
    • 한국표면공학회지
    • /
    • 제28권1호
    • /
    • pp.34-45
    • /
    • 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.

  • PDF

수정진동자의 임피던스 해석에 의한 LB막의 전기적 특성 (Electric Properties of LB Films using Impedance Analysis of Quartz Crystal)

  • 진철남;김경환;유승엽;권영수
    • 대한전기학회논문지:전기물성ㆍ응용부문C
    • /
    • 제48권7호
    • /
    • pp.503-507
    • /
    • 1999
  • Quartz crystal in contact with viscoelastic medium was described directly in terms of the electrical equivalent circuit of the system. Stearic acid was used as viscoelastic medium and deposited on the surface of quartz crystal using the Langmuir-Blodgett(LB) method. Impedance properties of quartz crystal coated with LB films which were investigated by using admittance diagram and $Ζ-\theta$ plot a method of impedance analysis. When stearic acid LB film was deposited on the surface of quartz crystal, resonant frequency of quartz crystal was changed about 100 Hz/layer. This result illustrates the ability of the sensor system to detect small amounts of special gas in air.

  • PDF

아조벤젠기를 갖는 장쇄지방산LB막의 광이성화 특성 (Properties of Photoisomerization of Organic-Ultrathin Films)

  • 김무군;박태곤;박근호
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1995년도 하계학술대회 논문집 C
    • /
    • pp.1184-1186
    • /
    • 1995
  • The absorption spectra of synthesis of azobenzene containing long chain fatty acids were investigated by UV spectrophotometer in chloroform solution. Also, the pressure-area isotherms of the molecules on the water-air interface were obtained and the LB films were fabricated onto a quartz slides and quartz crystals by the conventional Langmuir-Blodggett(LB) method. The UV absorption spectra of Langmuir-Blodggett(LB) films on quartz slides have been measured. From these measurements, following conclusions were obtained. Azobenzene containing long chain fatty acids show a photoisomerization by irradiation of UV light and visible light alternatively. At the pressure-area isotherms, the value of surface pressure increment were decreased when the number of $C_n$ increased. Also the LB films show a photoisomerization characteristics. So the LB film of azobenzene containing long chain fatty acid has possibility to being applied to functional molecular device such as photomemory and light switching.

  • PDF