Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Phase Transition Properties of Ferroelectric Polymer Films

강유전 고분자 박막의 상전이 특성

  • Park, Chul-Woo (Department of Laser and Optical Information Technology, Cheongju University) ;
  • Jung, Chi-Sup (Department of Laser and Optical Information Technology, Cheongju University)
  • 박철우 (청주대학교 레이저광정보공학과) ;
  • 정치섭 (청주대학교 레이저광정보공학과)
  • Received : 2013.12.18
  • Accepted : 2014.01.24
  • Published : 2014.02.01
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Abstract

Phase transition properties of the copolymer films of polyvinylidene fluoride (PVDF) and trifluoroethylene(TrFE), P(VDF-TrFE), were studied with X-ray diffraction (XRD) and polarization modulated ellipsometry (PME). XRD studies on both Langmuir-Blodgett (LB) films and spin coated films exhibit conversions from ferroelectric phase to paraelectric phase at $108{\pm}2^{\circ}C$ on heating and paraelectric phase to ferroelectric phase at $78{\pm}2^{\circ}C$ on cooling. The presence of the ferroelectric-paraelectric phase transition is also confirmed by the PME technique for the first time in this study. PME was proved to be a very sensitive tool in the measurement of the structural changes at the nano-thickness films.

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