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日野太郞,權寧守,姜道烈 弘益大學校 1987 弘大論叢 Vol.19 No.2
Langmuir-Blogett(LB) films of arachic acid and TCNQ (tetracyanoquinodimethane) were prepared in the sample of Al/LB film/A1 type where Al are electrodes, and polarization in LB film and dipolar moment of molecules in the films were measured by thermally stimulated current. It was determined from the direction of the thermally stimulated depolarization current that the hydrophilic radical was positive polarity in molecular dipoles of both LB films. Initial rise in thermally stimulated depolarization current was measured on LB films of TCNQ with alkyl radical (C_(12) TCNQ), then the activation in the current vs. temperature characteristics was determined. Dipolar moment of C_(12)TCNQ molecule in LB film was calculated by using the value of the activation energy and Lorentz local field, then it was evaluated at about 13 debyes. Al₂O₃ layer(about 30A thickness) was yielded on the Al electrode by natural oxidation in air. According to the cooperation of Al₂O₃ dielectric layer and the polarization of C_(12)TCNQ LB film, the macroscopic electrical field was yielded in LB film and Al₂O₃ layer. Calculating the electrical field by the polarization' due to dipolar moment of C_(12)TCNQ molecule, the field strength in C_(12)TCNQ LB films was evaluated at about 1 × 10^(8)~5 × 10^(6)V/cm. The field strength is decreased in increasing of number of LB monolayer and such a high field will be important in the electrical characteristics of LB films. LB film of C_(12)TCNQ is Z-type, so rather large polarization in the LB film will be yielded and high. electrical field will be also generated, comparing with the case in Y-type LB film as arachic acid film.
Langmuir-Blodgett막과 미래의 Electronics 소자
권영수,강도열,일야태랑 한국전기전자재료학회 1989 電氣電子材料學會誌 Vol.2 No.1
Langmuir-Boldgett(LB)법에 의해서 두께 1층당 약 4.angs.의 폴리이미드 LB막을 제작된 폴리이미드 LB막을 양전극사이에 sandwich시킨 Al/Al$_{2}$ $O_{3}$ /폴리이미드 LB막/Al(Au)구조의 소자를 이용하여 전기적 특성을 조사하였다. 전기저항이 대단히 큰 폴리이미드 LB막과 전기저항이 작은 $Al_{2}$ $O_{3}$막과의 상호작용에 의해 폴리이미드 LB막의 파괴전계는 약 1*$10^{8}$V/cm이었으며 터널전류는 이론값에 비하여 매우 작은 전류의 값을 나타내었다. 이와같은 현상은 전압의 대부분이 폴리이미드 LB막에 만이 인가되며 터널전류는 $Al_{2}$ $O_{3}$막에 의해 제한되기 때문이다.