• Title, Summary, Keyword: Ultra-thin

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Organic Gas Response Characteristics for Horizontal Direction of Fatty Acid LB Ultra-thin Films (지방산 LB초박막의 수평방향에 대한 유기가스 반응특성)

  • Lee, Jun-Ho;Choe, Yong-Seong;Kim, Do-Gyun;Gwon, Yeong-Su
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.5
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    • pp.379-384
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    • 1999
  • Langmuir-Blodgett(LB) films which have high ordered orientation and ordering structure are fabricated by LB method which deposit the ultra-thin films of organic materials at a molecular level. The electrical characteristics of stearic acid LB ultra-thin films for the horizontal direction were investigated to develop the gas sensor using LB ultra-thin films. The optimal deposition condition to deposit the LB ultra-thin films was obtained from $\pi-A$ isotherms and the deposition status of stearic acid LB ultra-thin films was verified by the measurement of deposition ratio, UV-absorbance, and electrical properties for LB ultra-thin films. The conductivity of stearic acid LB ultra-thin films for horizontal direction was about $10_{-8}[S/cm]$. The activation energy for LB ultra-thin films with respect to variation of temperature was about 1.0[eV], which was correspond to semiconductor material. The response characteristics for organic gas were confirmed by measuring the response time, recovery time, and reproducibility of the LB ultra-thin to each organic gas. Also, the penetration and adsorption behavior of gas molecule were confirmed through the organic gas response characteristics of LB ultra-thin films with respect to temperature.

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Analysis of Anisotropical Electrical Conduction Properties of Maleate System LB Ultra-thin Films (말레에이트계 LB초박막의 이방성 전기전도 특성의 해석)

  • Choe, Yong-Seong;Kim, Do-Gyun;Yu, Seung-Yeop;Gwon, Yeong-Su
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.49 no.1
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    • pp.13-18
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    • 2000
  • We have fabricated LB ultra-thin films of maleate system by LB technique and evaluated the deposited status of LB ultra-thin films by I-V characteristics such as capacitance. It was found that the thickness of LB ultra-thin per layer is $27~30[{\AA}]$ by XRD. And, we have known that the conductivity along the horizontal direction of LB ultra-thin films was about $10^{-8}[S/cm]$, it corresponds to the semiconducting materials. Also, the I-V characteristics along the vertical direction of LB ultra-thin films was dominated by Schottky type current, the activation energy obtained by current-temperature characteristics was about 0.84[eV] and the conductivity was about $10^{-14}[S/cm]$, it corresponds to the insulator. And, the anisotropic conduction mechanism of the LB ultra-thin films in vertical direction and horizontal direction is determined by the hydrophilic group and the hydrophobic group in LB ultra-thin films. The above results are applicable to the semiconductor devices such as switching device, which function at the molecular level.

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Fabrication and Characteristics of LB Ultra-thin Film Capacitor (I) (LB 초박막 커패시터의 제작 및 특성 (I))

  • 최용성;신훈규;권영수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.277-280
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    • 1995
  • We had experiment using LB method that can fabricate molecular order ultra-thin film below 100${\AA}$. LB mettled has known as main technology of information society in 21C, because it is nut only free oriention and alignment of molecular but also ability of thickness control as molecular order. In this paper, the fabricated condition and physical properities of functional ultra-thin film of molecular order was investigated and highly efficient ultra-thin film capacitor was fabricated by using ultra-thin LB film for application as electronic device. Possibility of ultra-thin film capacitor was researched by analizing rind measuring electrical properties. Polyimide ultra-thin LB film capacitor was fabricated, ensured theoretically rind experimentally its possibility in range of 10Hz∼ 1MHz through its frequency characteristics.

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Fabrication and Characteristics of LB Ultra-thin Film Capacitor (II) (LB 초박막 커패시터의 제작 및 특성 (II))

  • 유승엽;박재철;권영수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.244-247
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    • 1996
  • We had experiment using LB method that can fabricate molecular order ultra-thin film below 100${\AA}$. LB method has known as main technology of information society in 21C, because it is not only free orientation and alignment of molecular but also ability of thickness control as molecular order. In this paper, the fabricated condition and physical properties of functional ultra-thin film of molecular order was investigated and highly efficient ultra-thin film capacitor was fabricated by using ultra-thin LB film for application as electronic device. Possibility of ultra-thin film capacitor was researched by analyzing and measuring electrical properties. Polyimide ultra-thin LB film capacitor was fabricated, ensured theoretically and experimentally its possibility in range of 10Hz∼lMHz through its frequency characteristics.

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A Study of Injection Mold Manufacturing for Ultra-Thin Walled Plate (초박판 사출성형특성 분석을 위한 금형제작에 관한 연구)

  • Lee, Sung-Hee;Ko, Young-Bae;Lee, Jong-Won;Kim, Sung-Kyu;Yang, Jin-Suk;Heo, Young-Moo
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.2 no.5
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    • pp.11-15
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    • 2008
  • A micro-injection mold for ultra-thin-walled plate was considered in this work. The proposed mold system is for the fabrication of ultra-thin walled plastic plate with micro features by injection molding. As the injection molding of thin-walled plastic, which has the thickness under $400{\mu}m$, itself is not easy, the injection molding of the micro-features in the thin-walled structure is more complicated and difficult. To investigate the basic phenomenon of the ultra-thin walled part during the injection molding process, design of the part and mold system were performed in the present study. The injection molding and structural analysis of the suggested part and mold system were also performed. Consequently, injection molding system for ultra-thin walled plate with micro features were manufactured and presented.

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A Study on the Electrical Properties and Fabrication of Electret Element by Functional Ultra Thin Films -Electrical conduction in LB Ultra Thin Films of TCNQ- (기능성 초박막을 이용한 Electret 소자의 제작과 전기물성에 관한 연구-LB초박막 TCNQ의 전기전도 특성-)

  • 권영수;박만철;이원재;홍언식;강도열
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.40 no.5
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    • pp.489-495
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    • 1991
  • In this paper, we study the electrical conduction mechanism in Langmuir-Blodgett(LB) ultra thin films for which the LB device has a metal/LB films(TCNQ)/metal sandwich structure. Our experiments show that the current at the LB device does not depend on the temperature at below 0 C. This phenomena confirm that the electrical conduction current is a tunnel current inherent to ultra thin films. However, the current depends upon the temperature near the room temperature. This phenomena indicates the electeical conduction current is a Schottky current inherent to ultra thin films.

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Growth of Vertically Aligned CNTs with Ultra Thin Ni Catalysts

  • Ryu, Je-Hwang;Yu, Yi-Yin;Lee, Chang-Seok;Jang, Jin;Park, Kyu-Chang;Kim, Ki-Seo
    • Transactions on Electrical and Electronic Materials
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    • v.9 no.2
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    • pp.62-66
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    • 2008
  • We report on the growth mechanism of vertically aligned carbon nanotubes (VACNTs) using ultra thin Ni catalysts and direct current plasma enhanced chemical vapor deposition (PECVD) system. The CNTs were grown with -600 V bias to substrate electrode and catalyst thickness variation of 0.07 nm to 3 nm. The CNT density was reduced with catalyst thickness reduction and increased growth time. Cone like CNTs were grown with ultra thin Ni thickness, and it results from an etch of carbon network by reactive etchant species and continuous carbon precipitation on CNT walls. Vertically aligned sparse CNTs can be grown with ultra thin Ni catalyst.

Behaviors of Externally-Stimulated Organic Ultra Thin Films of Fatty Acid Halides (지방산 할로겐화물 유기초박막의 외부자극에 의한 거동)

  • Park, Keun-Ho;Lee, Jun-Ho;Kim, Duck-Sool
    • Journal of the Korean Applied Science and Technology
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    • v.26 no.1
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    • pp.102-108
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    • 2009
  • Behaviors of saturated fatty acid halides (CI4, C16, C18) were measured by LB method when the molecules were stimulated by pressure. The saturated fatty acid halides were deposited on the indium tin oxide(lTO) glass by the LB method. The average organic ultra thin film size and the surface roughness of the fatty acid halides thin films were investigated using AFM. It was found that AFM images show small surface roughness ($2.5{\sim}5.0\;nm$) and the organic ultra thin film size of $2.5{\sim}12\;nm$. Both aggregations and pin-holes were also seen on the AFM images. However we found that the surface roughness. These effects seem to be reasonable to be related to the increase of the organic ultra thin film size of fatty acid halides.