[PDF]    https://doi.org/10.3952/physics.v62i4.4825

Open access article / Atviros prieigos straipsnis
Lith. J. Phys. 62, 282–291 (2022)

TOWARDS WIRELESS DATA TRANSMISSION WITH COMPACTALL-ELECTRONIC THz SOURCE AND DETECTOR SYSTEM
Robertas Grigalaitisa, Rytis Šalaševičiusa, Jūras Banysa, Mirjana Vijatovic Petrovicb, Adis Dzunuzovicb, Maria Aparecida Zaghetec, Guilhermina F Teixeirac, and Biljana Stojanovicb
a Faculty of Physics, Vilnius University, Saulėtekio 9, 10222 Vilnius, Lithuania
b Institute for Multidisciplinary Research, University of Belgrade, Belgrade, Serbia
c Institute of Chemistry, São Paulo State University (Unesp), Araraquara, Brazil
Email: robertas.grigalaitis@ff.vu.lt

Received 14 October 2022; accepted 18 October 2022

Flexible multiferroic composite films are perspective materials for sensors, actuators and similar components of wearable and stretchable devices. Here we present the study of functional properties of flexible composites prepared by embedding nickel zinc ferrite and barium titanate powder into polyvinylidene fluoride (PVDF) polymer optimizing the ratio of polymer and fillers to get the best flexibility and functionality. ATR-FTIR analysis revealed that hot pressing of the flexible films caused a transformation of about 38% of the electro-inactive PVDF α phase into electrically active β and γ phases. Broadband dielectric spectroscopy revealed two relaxation processes responsible for PVDF and space charge relaxations. Activation energies of both processes and the freezing temperature of PVDF to the glass phase were estimated for all films. Ferroelectric measurements have shown unsaturated hysteresis loops for all samples, although the  clear dependence of the amount of the electrically active phase on polarization values of composites is visible.
Keywords: composites, flexible films, ferroelectric properties, dielectric dispersion


FUNKCINĖS LANKSČIŲ PLĖVELIŲ PVDF PAGRINDU SU NZF IR BT SAVYBĖS
Robertas Grigalaitisa, Rytis Šalaševičiusa, Jūras Banysa, Mirjana Vijatovic Petrovicb, Adis Dzunuzovicb, Maria Aparecida Zaghetec, Guilhermina F Teixeirac, Biljana Stojanovicb

a Vilniaus universiteto Fizikos fakultetas, Vilnius, Lietuva
b Belgrado universiteto Multidisciplininių tyrimų institutas, Belgradas, Serbija
c San Paulo valstybinio universiteto Chemijos institutas, Ararakvara, Brazilija
Lankstūs multiferoiniai kompozitai yra perspektyvios medžiagos dėvimų bei lanksčių įrenginių jutik­liams, aktuatoriams ir kitiems komponentams. Šiame darbe pristatomi lanksčių kompozitų, pagamintų įterpiant cinko ferito ir bario titanato miltelius į polivinilideno fluorido polimerą, funkcinių savybių tyrimai. Polimero ir intarpų santykis kompozite gamybos metu buvo parenkamas taip, kad būtų pasiektas maksimalus lankstumas nepakenkiant funkcionalumui. ATR-FTIR analizė atskleidė, kad karštas lanksčių plėvelių presavimas transformavo apie 38 % elektriškai neaktyvios α fazės į elektriškai aktyvias β ir γ fazes. Plačiajuostė dielektrinė spektroskopija parodė šiose medžiagose du relaksacinius procesus, sukeltus PVDF ir atitinkamai erd­vinio krūvio. Buvo įvertintos abiejų procesų aktyvacijos energijos bei PVDF stiklėjimo temperatūros visoms plėvelėms. Feroelektrinių medžiagų tyrimai parodė, kad histerezės kilpos neįsisotina. Nepaisant to, matoma aiški poliarizacijos savybių priklausomybė nuo elektriškai aktyvios fazės kiekio kompozituose.


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