• 제목/요약/키워드: Langmuir-Blodgett(LB} film

검색결과 195건 처리시간 0.023초

유기 반도체 CuPccp LB초박막의 제작 및 특성 (Fabrication and Properties of Organic Semiconductor CuPccp LB Thin Film)

  • 조민재;쑤양싸이양;이진수;안다현;정치섭
    • 센서학회지
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    • 제28권1호
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    • pp.23-29
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    • 2019
  • A copper tetracumylphenoxy phthalocyanine (CuPccp) thin film was formed on an organic insulator film by Langmuir-Blodgett (LB) deposition for gas sensor fabrication. To increase the reproducibility of film transfer, stearyl alcohol was used as a transfer promoter. The structural properties of the CuPccp layers were optically monitored through attenuated total reflection and polarization-modulated ellipsometry techniques. The average thickness of a single layer of the CuPccp LB film was measured to be 2.5 nm. Despite the role of the transfer promoter, the stability of the layer transfer was not sufficient to ensure homogeneity of the LB film. This was probably due to the presence of aggregates in the molecular structure of the CuPccp LB film. Nevertheless, copper phthalocyanine polymorphism can be greatly suppressed by the LB arrangement, which appears to contribute to the improvement of electrical conductivity. The p-type semiconductor characteristics were confirmed by Hall measurements from the CuPccp LB films.

PECCP LB 박막을 이용한 유기 발광 타이모드의 제작과 이의 특성 (Fabrication and Properties of OLEDs using PECCP Langmuir-Blodgett(LB) Films)

  • Lee, Ho-Sik;Lee, Won-Jae;Park, Myung-Gyu;Songe, Min-Jeng;Park, Jong-Wook
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2000년도 하계학술대회 논문집
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    • pp.831-834
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    • 2000
  • Characteristics of organic light-emitting diodes(OLEDs) were studied with devices made by PECCP[poly(3,6-N-2-ethylhexyl carbazolyl cyanoterephthalidene)] Langmuir-Blodget(LB) films. The emissive organic material was synthesized and named PECCP, which has a strong electron donor group and an electron accepter group in main chain repeated unit. The LB technique was employed to investigate the identification of the recombination zone in the ITO/PECCP LB films/Alq$_3$/Al structure by varying the LB film thickness. PECCP was considered as an emissive layer and Alq$_3$was used as an electron-transport layer. We measured current-voltage(I-V) characteristics, UV/visible absorption, PL spectrum, and EL spectrum of those devises.

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메로시아닌 색소 LB 단분자막의 광메모리 특성에 관한 정성적 연구 (A qualitative study of photomemory characteristics of the LB monolayer films of merocyanine dye)

  • 박태곤;권영수;강도열
    • 대한전기학회논문지
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    • 제44권7호
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    • pp.889-894
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    • 1995
  • The structural changes of the merocyanine monolayer LB (Langmuir Blodgett) films were investigated. These changes were compared with the typical changes of the molecular structures of merocyanine solutions. The structural changes of quinoid/benzenoid were attained by exposure to atmosphere gases (HCl gas, N $H_{3}$ gas). The photoisomerization was not observed for the monolayer LB film due to their state of $M_{trans}$. But we could obtain the cis/trans photoisomerization characteristics reversibly, after the films were changed to M $H^{+}$$_{trans}$ structure by exposure to HCl gas. We also found that the cis/trans photoisomerization of the LB monolayer films show the memory characteristics.s.

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유기전하 이동착물 Langmuir-Blodgett막의 누적조건 및 누적확인에 관한 연구 (Deposition condition and Confirmation of Organic Charge Transfer complex Langmuir-Blodgett Film)

  • 정순욱
    • 한국응용과학기술학회지
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    • 제14권1호
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    • pp.89-93
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    • 1997
  • In this research, ultra-thin films of organic charge transfer complex were deposited on to ordinary microscope slide-glass subtrates with a Langmuir-Blodgett technique. ${\pi}$-A isotherm characteristics of these complex were studied in order to find optimum conditions of deposition by varying temperature of subphase, compression speed, and spreading amount. Transfer ratio of these films were studied during the process of deposition. The UV-visible absorbance spectra of LB films were measured to find state of deposition by varing layer number. The observed optimum conditions of surface, pressure, spreading amount, and dipping speed for depositing LB films(Y-type) were 38m/Nm, $150{\mu}l$ and 5mm/min, respectively. Since the tansfer ratio is close to 100%, the monolayer on the subphase seems to be well transferred to the solid substrate. The thickness of the film was well-controlled as the UV-vis absorbance of films were changed linear according to the number of layers.

Octa(2-ethylhexyloxy)Copper-Phthalocyanine LB막의 $NO_2$ 가스 탐지 특성에 관한 연구 (A study on the $NO_2$ Gas Detection Characteristics of Octa(2-ethylhexyloxy)Copper-Phthalocyanine Langmuir-Blodgett films)

  • 임준석;김영관;김정수
    • E2M - 전기 전자와 첨단 소재
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    • 제10권5호
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    • pp.419-424
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    • 1997
  • It is well known that the metallo-phthalocyanines (MPcs) are sensitive to toxic gaseous molecules such as NO$_2$ as well as are chemically and thermally stable. Therefore, lots of MPcs have been studied as the potential chemical sensor for NO$_2$gas using quartz crystal microbalance(QCM) or electrical conductivity. In this study, thin films of octa(2-ethylhexyloxy)copper-phthalocyanine were prepared by Langmuir-Blodgett method and characterized by using UV-VIS absorption spectroscopy and ellipsometry. Optimal transfer condition of LB films was investigated and preliminary results of current-voltage(I-V) characteristics of these films exposed to NO$_2$gas as a function of film thickness, temperature and concentration were discussed.

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유기전하이동착체 랭뮤어-블로젯 초박막의 광전도 특성 (Photoelectric Properties of Organic Charge Transfer Complex Langmuir-Blodgett Ultra Thin Films)

  • 정순욱
    • 한국응용과학기술학회지
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    • 제18권1호
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    • pp.49-54
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    • 2001
  • Ultra-thin films of organic charge transfer complex were prepared on a hydrophilic substrate by Langmuir-Blodgett(LB) technique. In this study, the photoelectric properties of a LB film consisting of (N-docosyl quinolinium)-TCNQ(1:2) complex was investigated. The visible light(${\lambda}$ : 700 nm) of xenon lamp was illuminated on the LB films and light absorptivity and photoconductivity were observed. The photocurrent increased linearly and was saturated at the light intensity of 23 ${\mu}W/cm^{2}$.

MEH-PPV 공액성 고분자 Langmuir-Blodgett막의 제작에 관한 연구 (Study on the Preparation of MEH-PPV Langmuir-Blodgett Film)

  • 이명호;김영관;손병청
    • 한국응용과학기술학회지
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    • 제14권3호
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    • pp.79-87
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    • 1997
  • In this study, MEH-PPV was synthesized and MEH-PPV and its mixtures with PMMA were deposited on substrates with Langmuir-Blodgett(LB) technique and their photoluminescent char acteristics were investigated using UV-Vis absorption spectroscopy, and photoluminescence(PL) measurements. The surface morphology of the LB films of MEH-PPV and its mixture with PMMA were investigated using Atomic Force Microscopy(AFM). Electroluminescent devices using LB films were fabricated with Al and ITO as a top and bottom electrode, respectively, and their I-V characteristics were investigated.

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

  • 정순욱;정회걸
    • 한국응용과학기술학회지
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    • 제17권1호
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    • pp.29-35
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    • 2000
  • In this study, ultra-thin films of (N-docosyl quinolinium)-TCNQ(1:2) complex were prepared on the hydrophilic substrate by Langmuir-Blodgett(LB) technique. The characteristics of ${\pi}-A$ isotherms were studied to find optimum conditions of deposition by varying temperature of subphase, compression speed of barrier and amount of spreading solution. Using UV-vis spectra, capacitance and thickness, deposition of LB films was confirmed together with the thickness of the naturally oxidized aluminum film inside a device and dielectric constant of (N-docosyl quinolinium)-TCNQ(1:2) complex. The dielectric constant of LB film was about $4.59{\sim}5.58$. The electrical properties of (N-docosyl quinolinium)-TCNQ(1:2) complex were investigated at room temperature. The conductivity of this film measured by the direction of either vertical or horizontal axis was found to have a quite different value.

생체분자막을 이용한 생물분자소자의 개발 제1부 :효소분자 LB막을 이용한 에탄올 측정용 광학 바이오센서 (Development of Biomolecular Device Using Biomolecular Film Part 1: Optical Biosensor to Detect the Ethanol Using Langmuir-Blodgett Film of Eilzyme Molecules)

  • 최정우;배주연지용이원홍
    • KSBB Journal
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    • 제10권1호
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    • pp.105-112
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    • 1995
  • 본 연구에서는 LB기법에 의하여 분자수준으로 고 정화된 효소를 이용하여 에탄올의 양을 측정하는 광섬유 바이오센서가 개발되 었다. ADH는 arachidic acid의 단분자막에 LB기법으로 고정화된다. 센서의 출력신호를 분석하기 위하여 고정화된 ADH의 효소 반응은 ordered multisubstrate mechanism을 이용 하여 검토되었다. 광학 측정 시스템이 제시되었으며, 센서의 출력신호는 에단올의 농도에 비례하여 증가 하며 LB막에 누적된 누적충수와 관련이 있음을 알 수 있었다. LB막의 누적된 누적충수를 20충으로 증가하면 센서의 신호출력 범위가 확장되어 45mM의 고농도 에탄올도 측정할 수 있었다. 순수지질의 단 분자막과 효소가 흡착된 지질의 단분자막의 $\pi$-Aisotherm은 중성의 subphase에서 각기 다른 전하를 띠는 세 가지 종류의 지질에 대하여 조사되었다. ADH의 흡착도가 가장 우수한 지질은 arachidic a acid이며 이는 중성의 sub phase에서 양의 전하를 띠는 ADH 분자와 읍극의 전하를 띠는 arachidic a acid 분자 사이에 작용하는 정전기력에 기인한 것이다.

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Thermal Behavior of Langmuir-Blodgett Film of Poly(tert-butyl methacrylate) by Principal Component Analysis Based Two-Dimensional Correlation Spectroscopy

  • Jung, Young-Mee;Kim, Seung-Bin
    • Bulletin of the Korean Chemical Society
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    • 제26권12호
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    • pp.2027-2032
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    • 2005
  • This paper demonstrates details of thermal behavior of Langmuir-Blodgett (LB) film of poly(tert-butyl methacrylate) (PtBMA) by using the principal component analysis based two-dimensional correlation spectroscopy (PCA2D) through eigenvalue manipulating transformation (EMT). By uniformly lowering the power of a set of eigenvalues associated with the original data, the smaller eigenvalues becomes more prominent and the subtle contribution from minor components is now highlighted much more strongly than the original data. Thus, the subtle difference of thermal behavior of LB film of PtBMA from minor components, which is not readily detectable in the conventional 2D correlation analysis, is much more noticeable than the original data. PCA2D correlation spectra with EMT operation for the temperature-dependent IR spectra of LB film of PtBMA reveal the hidden property of phase transition processes during heating.