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Dielectric Properties of the Surface Layer in Ultra-Thin Films of a VDF/TrFE Copolymer.
- Source :
-
IEEE Transactions on Dielectrics & Electrical Insulation . Apr2004, Vol. 11 Issue 2, p227-231. 5p. - Publication Year :
- 2004
-
Abstract
- We measured the temperature and frequency dispersion of the permittivity of vinylidene fluoride and trifluoroethylene (YDF/TrFE) thin films spin-coated on glass substrates with evaporated aluminium electrodes. Assuming the existence of two surface layers with different dielectric properties from the bulk material, a thickness of 2 nm was deduced for each surface layer. The temperature dependence of the frequency dispersion of the permittivity of the surface layers was obtained. Each surface layer has a dielectric relaxation which is essentially the same as the segment mode of the amorphous region of the bulk. It shows no anomaly at the temperature of the paraelectric-ferroelectric phase transition for thick samples. The surface layers appear to be amorphous. [ABSTRACT FROM AUTHOR]
- Subjects :
- *FERROELECTRICITY
*THIN films
*DIELECTRICS
*DYNAMICS
*COPOLYMERS
*ELECTRODES
Subjects
Details
- Language :
- English
- ISSN :
- 10709878
- Volume :
- 11
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Dielectrics & Electrical Insulation
- Publication Type :
- Academic Journal
- Accession number :
- 13046753
- Full Text :
- https://doi.org/10.1109/TDEI.2004.1285891