진공증착법으로 제조된 P(VDF/TrFE) 박막의 유전특성

Dielectric Properties of P(VDF/TrFE) Thin Films Prepared by Vapor Deposition Method

  • 정무영 (인하대 공대 전기공학과) ;
  • 윤종현 (인하대 공대 전기공학과) ;
  • 이선우 (인하대 공대 정기 공학과) ;
  • 박수홍 (인하대 공대 정기공학과(공박)) ;
  • 유도현 (안산공과대 전기과(공박)) ;
  • 이덕출 (인하대 공대 전기공학과(공박))
  • 발행 : 2001.01.01

초록

P(VDF/TrFE) copolymer thin films with 70/30 and 80/20 mol% VDF (polyvinylidene fluoride) and TrFE (trifluoroethylene) rates were prepared by using a vapor deposition method, During thin films were prepared, the substrate temperatures were maintained at 30 $^{\circ}C$ and 120 $^{\circ}C$, and the heating source temperature was fixed at 350 $^{\circ}C$. Contary to PVDF homopolymer, P(VDF/TrFE) copolymers showed the Curie point(Tc) below the melting point. The Curie point (Tc) and the melting point of the P(VDF/TrFE) copolymers were changed as a function of substrate temperature and the VDF mol%. The Curie point and the melting point of P(VDF/TreFE) thin films decreased and increased with increasing substrate temperature, respectively. Also with increasing VDF mol%, the melting point decreased slightly, however the Curie point increased.

키워드

참고문헌

  1. Hari singh Nalwa, 'Ferroelectric Polymer', Marcel Dekker, Inc., pp.1-232, 1995
  2. Andrew J. Lovinger, T. Furukawa, G.T. Davis, and M.G. Broadhurst, 'Crystallographic changes characterizing the Curie transition in three ferroelectric copolymers of vinylidene fluoroethylene and trifluoroethylene ; 1. As-crystallized samples,' Polymers, Vol. 24, pp.1225-1232, 1983 https://doi.org/10.1016/0032-3861(83)90050-2
  3. K. Omata and H. Ohigashi, 'Temperature dependence of elastic, dielectric, and piezoelectric properties of single crystalline films of vinylidene fluoride trifluoroethylene copolymer,' J. Appl. Phys., Vol. 81, No. 6, pp.1760-2769, 1997 https://doi.org/10.1063/1.364300
  4. K.J. Kim and G.B. Kim, 'Curie transition, ferroelectric crystal structure and ferroelectricity of a VDF/TrFE(75/25) copolymer ; 2. The effect of polling on Curie transition and ferroelectric crystal structure,' Polymer, vol. 38, No. 19, pp.4881-4889, 1997 https://doi.org/10.1016/S0032-3861(96)00018-3
  5. 松永 孜, 分子機能材料と素子開發, 株式會社 N.D.S, 1994
  6. R. Gregorio Jr and M.M. Botta, 'Effect of crystallization temperature on the phase transitions of P(VDF.TrFE) copolymers,' J. Polymers Sci., Part B, Polymer Physics, Vol. 33, 1998 https://doi.org/10.1002/(SICI)1099-0488(199802)36:3<403::AID-POLB2>3.0.CO;2-S
  7. 이선우, 박수홍, 이덕출, '진공증착법에 의해 제조된 PDVF박막의 전기전도현상과 열자격전류에 관한 연구', J. KVS, Vol. 8, No. 3(1), pp.187-193, 1999
  8. T. Itoh, K. Maeda, H. Shibata, S. Tasaka, M. Hashimoto, 'Molecular structures and percolative phase transition on vinylidene fluoride - trifluoroethylene copolymer crystals,' J. Physical Society of Japan, Vol. 67, No. 4, pp.23-26, 1998 https://doi.org/10.1143/JPSJ.67.23