Regensburg 2013 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 19: Poster 2
DF 19.18: Poster
Wednesday, March 13, 2013, 15:00–17:30, Poster B2
Nanoscale characterization of electroactive polymer nanocomposites with ferroelectric crystalline additions — Dmitry Kiselev1, •Vladimir Shvartsman2, Maksim Silibin3, Alexander Solnyshkin3, and Doru Lupascu2 — 1National University of Science and Technology (MISiS), Moscow, Russia — 2Institut für Materialwissenschaft, Universität Duisburg-Essen, Essen, Germany — 3National Research University of Electronic Technology (MIET), Moscow, Russia
Ferroelectric polymers, in particular polyvinylidene fluoride (PVDF) and its copolymers, offer an attractive combination of properties such as relatively high spontaneous polarization, piezoelectricity, chemically inert behavior, electrical strength, and durability. Recently, attention of researchers has more and more often been attracted to objects simultaneously having properties of polymers and classical ferroelectrics. Such objects are composite films based on polymeric materials with addition of ferroelectrics, e. g. barium lead zirconate titanate (BPZT).
In this work, we report on local ferroelectric and piezoelectric properties of nanostructured polymer composites P(VDF-TrFE)+xBPZT (x = 0 - 50 %). High-resolution imaging of ferroelectric domains, local polarization switching, and polarization relaxation dynamics were studied by piezoresponse force microscopy. In particular, we found that BPZT inclusion usually show a strong unipolar piezoresponse signal, as compared to the polymer matrix. By scanning under high dc voltage films can be polarized uniformly under both positive and negative electric fields. Stabilty of the polarized state is discussed.