• Title/Summary/Keyword: Maxwell displacement current (MDC)

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A Study on the Electrical Properties of Organic Ultra Thin Films for Nanoscale Device Manufacture (나노스케일 소자제작을 위한 유기초박막의 전기적특성에 관한 연구)

  • Song, Jin-Won;Han, Chang-Su;Lee, Kyung-Sup
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.384-385
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    • 2005
  • Monolayers of lipids on a water surface have attracted much interest as models of biological membranes, but also as precursors of multilayer systems promising many technical applications. Until now, many methodologies have been developed in order to gain a better understanding of the relationship between the structure and function of the monolayers. Maxwell displacement current (MDC) measurement has been employed to study the dielectric property of Langmuir-films. MDC flowing across monolayers is analyzed using a rod-like molecular model. It is revealed that the dielectric relaxation time $\tau$ of mono layers in the isotropic polar orientational phase is determined using a liner relationship between the monolayer compression speed a and the molecular area $A_m$. Compression speed a was about 30, 40, 50mm/min. also, LB layers of Arachidic acid deposited by LB method were deposited onto slide glass as Y-type film. The structure of manufactured device is Au/Arachidic acid/Al, the number of accumulated layers are 9 ~ 21 and we then examined of the Metal-Insulator-Metal(MIM) device by means of I-V.

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A study on the electrical properties of lipid monolayers by displacement current method (변위전류법에 의한 지질단분자막의 전기특성에 관한 연구)

  • 이경섭;권영수
    • Electrical & Electronic Materials
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    • v.9 no.5
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    • pp.450-454
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    • 1996
  • Maxwell-Displacement-Current(MDC) measuring technique has been applied to the study of monolayers of Dilauroylphosphatidylcholine (L-.alpha.-DLPC) and Dimyristoylphosphatidylcholine (L-.alpha.-DMPC). The displacement current was generated from monolayers on a water surface by monolayer compression. Displacement current was generated when the area per molecule was about 250.angs.$^{2}$, 280.angs.$^{2}$. Displacement current was generated in the gas state, gas/liquid state, and liquid state in the course of monolayer compression. The orientational change of molecules in monolayers was discussed on the basis of the MDCs obtained. Finally, we measured differential thermal analysis of sample.

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A Study on the Stimulus Properties of Arac. acid and Phospholipid Organic Monolayer (Arac. acid와 인지질 유기단분자의 자격특성에 관한 연구)

  • Song, Jin-Won;Lee, Kyung-Sup
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.04b
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    • pp.104-107
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    • 2000
  • It is well known that the state of existence of molecules on the surface of water changes during compression of the molecules. Electric methods, such as the measurement of the surface potential or displacement current, are also useful for investigating dynamic changes of the molecular state on the water surface during compression. Maxwell-Displacement-Current(MDC) measuring technique has been applied to the study of monolayers of Arachidic acid and L-$\alpha$-Dimyristoyl Phosphatidylcholine(L-$\alpha$-DMPC). The displacement current was generated from monolayers on a water surface by monolayer compression. Displacement current was generated in the gas state, gas/liquid state, and liquid state in the course of monolayer compression. The researchers examined diplacement current of electric conduction organic monolayer generated due to orient change of monolayers alkylchain.

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A Study on the Phase Transition of DPPC Organic Films (DPPC 유기박막의 상전이에 관한 연구)

  • 김동관;이순형;최영일;최충석;장희동;이경섭
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.491-494
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    • 2000
  • 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-transition over the entire range of molecule areas. At the liquid-solid phase transition, a striking feature in the present current measurement was observed; the I-A isotherm for a DPPC monolayer has sharp bend. Dynamic behavior of monolayers in the presence of an external field was also investigated using the current-measuring technique. Dynamic behavier of DPPC monolayer was measured by displacement current when the molecules are stimulated by pressure velocity. As result, it is known that current is generated of higher current pe마 as compression velocity become faster. Also, in order to clarify the reorganization of the lipid monolayers, it is instructive to plot the relationship between I and 1/$A^2$.

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Displacement Properties of Nano Structure Dendrimer (나노구조 덴드리머의 변위특성)

  • Song, Jin-Won;Lee, Kyung-Sup
    • Proceedings of the KIEE Conference
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    • 2004.07c
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    • pp.1724-1726
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    • 2004
  • Monolayers of lipids on a water surface have attracted much interest as models of biological membranes, but also as precursors of multilayer systems promising many technical applications. Until now, many methodologies have been developed in order to gain a better understand. Photoisomerization in monolayers of a novel azobenzene compound, azobenzene dendrimer, was investigated for the first time by means of the absorption spectrum and Maxwell displacement current (MDC) technique. Dendrimers are well-defined macromolecules exhibiting a tree-like structure, first derived by the cascade molecule approach. According to the absorption spectrum, trans-to-cis conversion ratio was estimated to the third generation of azobenzene dendrimer deposited onto a glass substrate. Temperature-dependent induced charge with trans-cis isomerization was also measured by means of MDC technique.

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A Study on the Displacement Properties of Functional LB Monolayers (기능성 LB단분자막의 변위특성에 관한 연구)

  • Song, Jin-Won;Choi, Young-Il;Lee, Kyung-Sup
    • Proceedings of the KIEE Conference
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    • 2003.10a
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    • pp.114-116
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    • 2003
  • Monolayers of lipids on a water surface have attracted much interest as models of biological membranes, but also as precursors of multilayer systems promising many technical applications. Until now, many methodologies have been developed in order to gain a better understand. Photoisomerization in monolayers of a novel azobenzene compound, azobenzene dendrimer, was investigated for the first time by means of the absorption spectrum and Maxwell displacement current (MDC) technique. Dendrimers are well-defined macromolecules exhibiting a tree-like structure, first derived by the cascade molecule approach. According to the absorption spectrum, trans-to-cis conversion ratio was estimated to the third generation of azobenzene dendrimer deposited onto a glass substrate. Temperature-dependent induced charge with trans-cis isomerization was also measured by means of MDC technique.

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A Study on the Properties of Langmuir Films from Saturated Fatty Acid (포화지방산 Langmuir막의 물성에 관한 연구)

  • Park, Keun-Ho;Kim, Jea-Dong
    • Journal of the Korean Applied Science and Technology
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    • v.15 no.3
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    • pp.91-96
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    • 1998
  • The saturated fatty acids(arachidic acid, stearic acid, and palmitic acid) were repeatedly applied on water surface, and their ${\pi}-A$ isotherms and Maxwell displacement current(MDC) were measured to identify the effect of the number of carbons of fatty acids on the properties of Langmuir films. The saturated fatty which contain higher carbon number showed higher MDC peak, and the less carbon it contains, the higher surface pressure they show. It was found the maximum of MDC peaks was as the molecular area just before the surface pressure increases in compression cycles of saturated fatty acids.

A Study on the Stimulation Transmit of PBDG (PBDG의 자격 전달에 관한 연구)

  • Kim, D.K.;Lee, K.S.
    • Proceedings of the KIEE Conference
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    • 1999.07d
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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.

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A Study on the Electrical Properties of Phospholipid and Azobenzene Mixed Films (인지질-아조벤젠 혼합막의 전기특성에 관한 연구)

  • Cho, S.Y.;Lee, K.S.
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.1702-1704
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    • 2000
  • Molecular cis-trans switching in mono and multilayer systems containing azobenzene is of particular interest in physics. chemistry and electronics. because of the possible application of the switching. Molecular swiching in phospholipid and azobenzene mixed monolayers on a water surface was examined by Maxwell displacement current(MDC) measurements. As a result. It's phtoisomerization progressed by 8A5H in mixed films.

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Electronic Properties of MIM Structure for application in Communication Device (통신소자 응용을 위한 MIM 구조 유기박막의 전자특성)

  • Choi, Young-Il;Song, Jin-Won;Lee, Kyung-Sup
    • Proceedings of the IEEK Conference
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    • 2005.11a
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    • pp.1279-1282
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    • 2005
  • Maxwell displacement current (MDC) measurement has been employed to study the dielectric property of Langmuir-films. MDC flowing across monolayers is analyzed using a rod-like molecular model. LB layers of Arachidic acid deposited by LB method were deposited onto slide glass as Y-type film. The structure of manufactured device is Au/Arachidic acid/Al, the number of accumulated layers are $3{\sim}9$. Also, we then examined of the MIM device by means of I-V. The I-V characteristic of the device is measured from -3 to +3[V].

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