• Title, Summary, Keyword: LB Technique

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Technology Trend of surface Wettability Control Using Layer-by-Layer Assembly Technique (다층박막법을 이용한 표면 젖음성 제어 기술 동향)

  • Sung, Chunghyun
    • Journal of Adhesion and Interface
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    • v.18 no.4
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    • pp.171-178
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    • 2017
  • Recently, layer-by-layer (LbL) assembly has emerged as a promising fabrication technique in controlling surface wetting properties. LbL assembly technique is eco-friendly versatile technique to control the hierarchical structure and surface properties in nano- and micro-scale by employing a variety of materials (e.g., polymers, surfactants, nanoparticles, etc.). This article reviews recent progress in controlling the surface wetting using LbL technique. In particular, technical trends and research findings on fabrication and the applications of superhydrophobic, superhydrophilc, and superoleophobic/superhydrophilic LbL surfaces are extensively explained. Additionally, basic principles and fabrication methods in emerging areas such as omniphobic, self-healing, intelligent and responsive LbL surfaces are discussed.

Emitting Properties of Poly(3-hexylthiophene) deposited by LB method (LB법에 의한 제막된 poly(3-hexylthiophene)의 발광특성)

  • Seo, Bu-Wan;Kim, Ju-Seung;Gu, Hal-Bon;Lee, Kyung-Sup;Park, Bok-Gi;Park, Gye-Chun
    • Proceedings of the KIEE Conference
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    • pp.962-964
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    • 1999
  • We studied emitting properties of devices fabricated using the spin-coating and Langmuir-Blodgett[LB] technique. The LB technique has the advantage of precise control of the thickness better than spin-coating method. Poly(3-hexylthiophene)[P3HT] LB films used as the emitting layer in light-emitting devices. LB monolayers were deposited 27 layers onto the indium-tin-oxide[ITO] as Y-type films by the vertical dipping method. The thickness is about 80nm. Absorption spectrum of LB films presented that P3HT is regiorandom conformation. Also, current-voltage-luminance characteristics and electroluminescence spectra of light-emitting devices fabricated by LB method is studied. In current-voltage-luminescence characteristics, turn-on voltage of P3HT LB film LEDs is higher than that of spin-coating LEDs. But electroluminescence spectrum is similar to the spin-coating LEDs. The orange-red light was clearly visible in a darkened room.

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Emission Properties of Electro luminescent Devices using Poly(3-hexylthiophene) Deposited by LB Method (LB법으로 첨가한 Poly(3-hexylthiophene)을 발광층으로 사용한 전계발광소자의 발광특성)

  • 김주승;이경섭;구할본
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.14 no.9
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    • pp.757-761
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    • 2001
  • We studied emitting properties of organic electroluminescent devices fabricated using the spin-coating and Langmuir-Blodgett(LB) technique. The LB technique has the advantage of precise control of the thickness better than spin-coating method. LB monolayer of poly(3-hexylthiophene)(P3HT) was deposited 27 layers onto the indium-tin-oxide(ITO) substrate as Y-type films by the vertical dipping method. In the absorption spectra, the λ$\_$max/ of P3HT-AA LB films and of spin-coating films showed about at 510, 545 and 590 nm corresponding to 2.43, 2.28, 2.10eV. And we observed that the turn-on voltage of devices deposited by LB method(10V) was higher than that of spin-coating method(8.5V) in voltage-current-luminance characteristic. In the logV-logJ characteristics of ITO/P3HT-AA LB/Al device, we confirmed that El device fabricated by LB method follows three conduction mechanisms: ohmic, space-charge-limited current(SCLC) conduction and trapped-carrier-limited space-charge current(TCLC) conduction.

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A study on patterning of photosensitive polyimide LB film (감광성 polyimide LB막의 pattern형성에 관한 연구)

  • 김현종;채규호;김태성
    • Electrical & Electronic Materials
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    • v.9 no.1
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    • pp.59-66
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    • 1996
  • Polyimides containing cyclobutane ring in main chain is known to be thermally stable and able to be developed in organic solvents after photolysis with 254 nm UV light. This type of polyimides can be used as promising positive photoresist in VLSI fabrication process. In the current VLSI process, photoresist films are formed by spin coating. The film thickness is more than several hundred nano meters. It seems that there is room for improvement of film coating process by introducing Langmuir Blodgett technique. Thereby ultra thin film photoresist can be formed, and higher density of integration in VLSI be achieved. In the present work, depositing procedure of LB films of this polyimide was investigated. LB film thickness was measured by ellipsometry to evaluate deposited film status. Chemical imidization procedure was studied to avoid several problems in thermal imidization. The pattern of submicron dimension has successfully formed on LB film of 8nm thick, which found showing good contrast.

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Fabrication as Ultra-thin films of Amphiphilic Squarylium dye by the Langmuir-Blodgett Technique (랭뮤어-블로젯법에 의한 양친매성 스쿠아릴리움 색소의 초박막 제작)

  • Jeong, Sun-Uk
    • Korean Journal of Materials Research
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    • v.9 no.6
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    • pp.595-598
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    • 1999
  • Ultra-thin films of amphiphilic Squarylium dye were prepared on the hydrophilic glass substrate by Langumuir-Blodgett(LB) technique. From the measurement of the surface pressure-area($\pi$-A) isotherm at air-water interface, it was found that amphiphilic Squarylium dye can form the stable monolayers. Using the LB technique, the Z-type monolayer assembly can be obtained. The amphiphilic Squarylium dye LB films exhibit λ\ulcorner at 684nm. The absorption is significantly red-shifted from solution of amphiphilic Squarylium dye(637nm in chloroform), suggesting that the Squarylim chromophores form J-aggregate in the LB film.

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Analysis of Gas Response Characteristics of Maleate Organic Ultra-thin Films (말레에이트계 유기초박막의 가스 반응 특성 분석)

  • Choe, Yong-Seong;Kim, Jeong-Myeong;Kim, Do-Gyun;Gwon, Yeong-Su
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.6
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    • pp.442-450
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    • 1999
  • In this paper, we have fabricated Langmuir-Blodgett(LB) films by LB technique and evaluated the deposited status of LB films by UV-vis absorbance. It was found thatthe thickness of LB films per a layer are $27~30[{\AA}]$ by ellipsometry. The responeses between LB films and organic gases were investigated using by I-V characteristics of LB films and F-R diagram of quartz crystal. The response orders between LB films and organic gases observed by I-V characteristics were as following ; chloroform, methanol, acetone and ethanol in the order of their short chain length. The response mechanism between LB films and organic gases observed by F-R diagram of quartz crystal could be modeled on adsorption at surface, penetration, desorption at surface and inside.

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Electroluminescence device of the new organic materials using Langmuir-Blodgett(LB) method (LB 법을 이용한 새로운 유기물의 전기 발광 소자에 관한 연구)

  • 이호식;이원재;박종욱;김태완;강도열
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.601-604
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    • 1999
  • Electroluminescence(EL) devices based on organic thin films have attracted lots of interests in large-area light-emitting display. Recently, many EL researcher have interested a new emissive organic material. In this study, light-emitting organic electroluminescent devices were fabricated using Langmuir-Blodgett(LB) technique with new emissive organic material. This new emissive organic material were synthesis by our teams and we called PECCP [poly(3,6-N-2ethylhexyl carbazoly cyanoterephthalidene)] which has strong electron donor group and electron acceptor group in main chain repeat unit. This material has good solubility in common organic solvent such as chloroform. THF, etc. and has a good stability in air. In here, the new emissive material is applied to Langmuir-Blodgett(LB) method because our new material has a good stability in air. Optimum conditions of film deposition were examined by a surface pressure-area( $\pi$ -A) isotherms with various factors. The LB film were deposited on a indium Tin Oxide(ITO) glass. We were investigated by measuring current-voltage(I-V) characteristics. Also we were measured the UV/visible absorption at about 410nm and PL spectrum at about 530nm. We are attempt to the electroluminescence device properties of the new emissive material by Langmuir-Blodgett(LB) technique.

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Fluorescence Immunoassy of HDL and LDL Using Protein A LB Film

  • Choi, Jeong-Woo;Park, Jun-Hyo;Lee, Woo-Chang;Oh, Byung-Keun;Min, Jun-Hong;Lee, Won-Hong
    • Journal of Microbiology and Biotechnology
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    • v.11 no.6
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    • pp.979-985
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    • 2001
  • A fluorometric detection technique for HDL (High Density Lipoprotein) and LDL (Low Density Lipoprotein) was developed for application in a fiber-optic immunosensor using a protein A Langmuir-Blodgget (LB) film. For the fluorescence immunoassay, antibodies specific to HDL or LDL were imobilied on the protein A LB film, and a fluorescence amplification method was developed to overcome their weak fluorescence. The deposition of protein A using the LB technique was monitored using a surface pressure-are $({\pi}-A)$ curve, and the antibody immobilization of the protein A LB film was experimentally verified. The immobilized antibody was used to separate only HDL and LDL from a sample, then the fluorescence of he separated HDL or LDL was amplified. The amount of LDL or HDL was measured using the developed fiber optic fluorescence detection system. The optical properties resulting from the reaction of HDL or LDL with o-phtaldialdehyde, detection range, response time, and stability of the immunoassay were all investigated. The respective detection ranges for HDL and LDL were sufficient to diagnose the risk of coronary heart disease. The amplification step increased the sensitivity, while selective separation using the immobilized antibody led to linearity in the sensor signal. The regeneration of the antibody-immobilized substrate could produce a stable and reproducible immunosensor.

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Studies on the Patterning of Polyimide LB Film and Its Application for Bioelectronic Device (폴리이미드 LB 필름을 이용한 패터닝 및 생물전자 소자로의 응용에 관한 연구)

  • 오세용;박준규;정찬문;최정우
    • 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.