• Electrical & Electronic Materials
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• v.9 no.7
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• pp.696-701
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• 1996

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.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.10a
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• pp.11-14
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• 2000

This paper describes a thennally stimulated displacement current(TSDC) of polyamic acid alkylamine salts(PAAS) Langmuir-Blodgett(LB) films, which is a precursor of polyimide(PI). The TSDC measurements of PAAS LB film were performed from room temperature to about $250^{\circ}C$ and the temperature was increased at a rate of $0.2^{\circ}C/s$. This show that this is TSDC peaks at about $70^{\circ}C$ in the arachidic acid LB films, and at about $70^{\circ}C$ and $160^{\circ}C$ in the PAAS LB films. Results of this measurements indicate that one small peak at $70^{\circ}C$ is resulted from a softening of the alkyl group and the large peak at $160^{\circ}C$ is possibly due to dipole moment of C-O group in the PAAS molecule. We have calculated the vertical component of dipole moment of the P AAS LB film out of the TSDC curves. It shows that the dipole moment of PAAS LB film is about -40mD at $70^{\circ}C$ and about 200mD at $160^{\circ}C$ in the first measurement of TSDC. In the second measurement of TSDC of PAAS LB film after cooling down to room temperature, the TSDC peaks are almost disappeared.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.11 no.8
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• pp.581-586
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• 1998

This paper describes athermally stimulated displacement current (TSDC) of arachidic acid(AA) and polyamic acid alkylamine salts(PAAS) Langmuir-Blodgett(LB) films, which is a precursor of polyimide(PI). The TSDC measurements of AA LB film were performed from temperature to about 11$0^{\circ}C$ at a rate of 0.2$^{\circ}C$/ｓ inside a vacuum chamber for a reference. And the TSDC measurements PAAS LB film were performed from room temperature to about 25$0^{\circ}C$ and temperature was increased at the same rate as that of AA LB film. They show that there are TSDC peaks at about 7$0^{\circ}C$ in the arachidic acid LB films, and at about 7$0^{\circ}C$ and 16$0^{\circ}C$ in the PAAs LB films. Results of these measurements indicate the one small peak at 7$0^{\circ}C$ is resulted from a softening of the alkyl group and the large peak at 16$0^{\circ}C$ is possibly due to dipole of C-O group in the PASS molecule. We have calculated the vertical component of the AA and PAAs L film out of the TSDC curves. It shows that the dipole moment of the AA LB film is about 70-mD at 7$0^{\circ}C$. And the dipole moment of PAAS LB film is about 040mD at 7$0^{\circ}C$ and about 200mD at 16$0^{\circ}C$ in the first measurement of TSDC. In the second measurement of TSDC of PASS LB film after cooling down to room temperature, the TSDC peaks are almost disappeared.