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이경섭,김우연,권영수,이준응,강도열 한국전기전자재료학회 1996 電氣電子材料學會誌 Vol.9 No.7
In this study, deposited lipid membranes on the electrode and detected thermally stimulated displacement current generated from it. The researchers examined displacement current of electric conduction organic monolayer generated due to orient change of monolayers alkylchain and changed of dipole moment vertical component due to thermally stimulated. We paid attention to the phase transition temperature obtained by the thermally stimulated displacement current of lipid membrane layers this time. We detected the thermally stimulated displacement current peak of layers. From above results the transition temperature dilauroylphosphatidylcholine layers is about 43.deg. C. This study also compared above results with those obtained by differential thermal analysis method.
강도열,신동명,송동미,손병청 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.3
The polyimide film surface was modified with KOH aqueous solutions or sulfuric acid. The film thickness was increased by about 10% through the modification of film surface. Hydrolysis of amide bonds and hydration of water induced the increase. The polarity of the film surface increased and identified by contact angle measurement. The depth and roughness of modified was increased. After treatment of surface with water, alkyl and 4-pentyloxyaniline were introduced on the film surface by complex formation between anionic species formed on the imide surface and ammonium ion. The newly introduced alkyl group was identified by FT-IR spectroscopy. Surface polarity reduced dramatically and the roughness was increased after introduction of ammonium salt.
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.