0475651 - ÚMCH 2018 RIV US eng J - Journal Article
Piana, Francesco - Pfleger, Jiří - Jambor, R. - Řičica, T. - Macák, J. M.
High-k dielectric composites of poly(2-cyanoethyl vinyl ether) and barium titanate for flexible electronics.
Journal of Applied Polymer Science. Roč. 134, č. 37 (2017), s. 1-10, č. článku 45236. ISSN 0021-8995. E-ISSN 1097-4628
R&D Projects: GA TA ČR(CZ) TE01020022; GA MŠMT(CZ) LO1507
Institutional support: RVO:61389013
Keywords : composites * dielectric properties * nanocrystals
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impact factor: 1.901, year: 2017 ; AIS: 0.309, rok: 2017
DOI: https://doi.org/10.1002/app.45236

High-k dielectric composite material for electronic applications was obtained by mixing a polymer with high dielectric constant, poly(2-cyanoethyl vinyl ether) (CEPVA), and highly crystalline barium titanate (BT). Barium titanate nanoparticles of a size in the range 40-90nm were prepared by the solvothermal method. By optimizing the reaction conditions, the formation of carbonate impurities and the agglomeration of formed nanoparticles were significantly reduced compared to state-of-the-art procedures. Dielectric spectroscopy was measured in the range of 0.01Hz to 10 MHz and showed the dielectric constant to be epsilon ' similar to 35-40 with only 30 vol % content of BT in the composite. Extrapolating to 100% BT nanoparticle concentration and using the Lichtenecker model, the dielectric constant epsilon ' = 365 +/- 27 at 10 kHz was obtained. The relaxation and electrical properties were investigated in depth, and a new relaxation phenomenon was revealed. CEPVA/BT composite is considered suitable for electronic applications, in which high together with a good mechanical flexibility are required, such as organic field effect transistors.
Permanent Link: http://hdl.handle.net/11104/0272714