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강유전성 고분자 P(VDF-TrFE) LB박막의 전기광학 특성
곽은휘,정치섭,Kwak, Eun-Hwi,Jung, Chi-Sup 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.7
Electro-optic modulators based on 25 monolayer langmuir-blodgett films of vinylidene fluoride and trifluoroethylene, P(VDF-TrFE), were fabricated. The LB films were prepared by transferring the monolayers on to an ITO coated glass with a surface pressure of 5 dyne/cm by use of the langmuir-schaefer deposition method. Measurement of the electro-optic coefficient has been carried out using a simple reflection techique. The E/O coefficient was found to be 154.9 pm/V and that value remained stable for at least 50 days.
곽은휘,이진호,정치섭 청주대학교 산업과학연구소 2009 産業科學硏究 Vol.26 No.2
The ultrathin films of poly(vinylidenfluoride with trifluoroethylene),P(VDF-TrFE), were fabricated by using Langmuir-Schaefer method. In this experiment, the formation process of the monolayer on the water surface was investigated with Brewster angle microscope (BAM). For the improvement of crystalline anisotripy, thermal annealing has been carried out. The annealing induced crystal structure change in Langmuir-Blodgett(LB) film was intensively investigated with atomic force microscope (AFM).
곽은휘,이진호,정치섭,Kwak, Eun-Hwi,Lee, Jin-Ho,Jung, Chi-Sup 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.8
We report the studies on the structrural properties of Langmuir Blodgett (LB) films fabricated from the copolymer of vinylidenefluoride (VDF) with trifluoroethylene(TrFE). The formation of nanomesas induced by thermal annealing at $135\;^{\circ}C$ for 1 hour was investigated with the atomic force microscope (AFM) and the X-ray diffractometer (XRD). From the result of surface morphology change in 30 monolayer LB film, we find that the annealing treatment on the P(VDF-TrFE) LB film result in the plastic deformation of crystalline polymer. The ${\beta}$ phase crytalline structure in annealed LB film was clearly confirmed from the XRD peak at $19.7^{\circ}$.