BaTiO3–P(VDF-HFP) nanocomposite dielectrics—Influence of surface modification and dispersion additives

Ehrhardt, Claudia; Fettkenhauer, Christian; Glenneberg, Jens; Münchgesang, Wolfram; Pientschke, C.; Großmann, Thomas; Zenkner, Mandy; Wagner, G.; Leipner, Hartmut S.; Buchsteiner, A.; Diestelhorst, M.; Lemm, Sebastian; Beige, H.; Ebbinghaus, Stefan G.

doi:10.1016/j.mseb.2013.04.013

Cited by 30 publications

(29 citation statements)

References 38 publications

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“…Due to the high dielectric constant as well as unique piezoelectric and pyroelectric properties of barium titanate (BaTiO 3 or simply BT) , its nanopowder is extensively utilized with many synthetic polymers in making high‐κ ceramic‐polymer nanocomposites for several compact capacitor applications including tunable capacitors, pyroelectric sensors, nonvolatile memories, and surface acoustic wave devices . The microstructural, mechanical, and dielectric properties of such systems have been demonstrated as well .…”

Section: Introductionmentioning

confidence: 99%

Processing, Dynamic mechanical thermal analysis, and dielectric properties of barium titanate/cellulosic polymer nanocomposites

et al. 2015

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High dielectric constant BaTiO 3 /ethyl cellulose (BT/EC) nanocomposites having BT loadings of up to 13 vol% were fabricated through a simple casting technique. The BT filler powder, synthesized through an ultrasonicassisted solid-state route, was revealed by X-ray powder diffractometry (XRD) and Raman spectroscopy to be dominantly tetragonal. Scanning electron microscopy (SEM) showed good dispersion of the BT nanoparticles in the EC polymer matrix at lower BT concentrations. However, at higher concentrations, the BT particles form a continuous phase or a "filler network" leading to weak BT/EC interactions. This finding is well supported by the results of the tensile strength and storage modulus. The dielectric properties of the BT/EC nanocomposites were investigated over wide ranges of frequency and temperature. The addition of BT significantly increased the permittivity (e 0 ) and dielectric loss (e 00 ) and improved the ionic conductivity of the EC. The electric modulus (M 00 ) results were analyzed in terms of the Havriliak-Negami function through three distinct relaxation mechanisms (namely a, b*, and b relaxations) in the temperature range 30-1508C. The dc conductivity (r dc ) results suggest that the BT/EC nanocomposites formed at low BT loading (up to 7.0 vol%) and a temperature of £ 608C are good candidates for antistatic applications while those formed at higher concentrations and temperatures are recommended for use in electrostatic dissipation applications.

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Section: Introductionmentioning

confidence: 99%

Processing, Dynamic mechanical thermal analysis, and dielectric properties of barium titanate/cellulosic polymer nanocomposites

et al. 2015

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“…As earlier reported, the use of BYK leads to a homogeneous particle distribution in the phosphonic acid modied BTO@PFBPA/P(VDF-HFP) system, resulting in an increase of the permittivity. 27 As shown in the le part of Fig. 8, BYK effectively suppressed the formation of small defects.…”

Section: Morphology and Dielectric Properties Of Composite Lmsmentioning

confidence: 85%

“…without any calcination step) with a ratio of approximately 35% tetragonal and 65% pseudo-cubic phase as determined by Rietveld renement. 27 The formation of the pseudo-cubic phase is well known for very small BaTiO 3 particles. 30 Using a helium pycnometer, a density of 5.10 g cm À3 was obtained.…”

Section: Characterization Of As-prepared and Surfactant-coated Bto Pamentioning

confidence: 99%

Enhanced dielectric properties of sol–gel-BaTiO₃/P(VDF-HFP) composite films without surface functionalization

et al. 2014

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“…To obtain 0-3 composites with interesting piezoelectric properties, high volume fractions of ceramic particles, which have high surface energy, are introduced in a polymeric matrix with much lower surface energy, with consequent problems such as particle agglomeration and porosity [9,10]. As a very common approach for achieving better dispersion, and hence lower porosity and better dielectric and mechanical properties, coupling agents, including, e.g., silanes or phosphonic acids [11][12][13][14], are used to increase the compatibility between the ceramic particles and the matrix, by decreasing the surface energy of the particles, and in some cases creating bonds with the matrix. Silanes and phosphonic acids are commercially available bearing a wide range of functional groups on their non-hydrolyzable organic chain, as e.g., alkyl, amino, or fluorinated groups.…”

Section: Introductionmentioning

confidence: 99%

Interface-Dominated Time-Dependent Behavior of Poled Poly(Vinylidene Fluoride–Trifluoroethylene)/Barium Titanate Composites

et al. 2020

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Composites in which particles of ferroelectric ceramic phase are randomly dispersed in a polymeric matrix are of interest because of flexibility, conformability, and ease of processing. However, their piezoelectric properties are rather low, unless very high volume fractions of ceramics are used. This brings agglomeration and porosity issues due to the large mismatch between the surface energies of the ceramics and of the polymer. Particle surface modification is a common approach for better dispersion; however, it may bring other effects on the properties of the composites, which are usually concealed by the huge improvement in performance due to the more homogenous microstructure. In this work, we compared poly(vinylidene fluoride–trifluoroethylene)/barium titanate composites containing 15 vol.% and 60 vol.% of pristine ceramic particles or particles modified with an aminosilane or a fluorosilane. Similar morphology, with good particle dispersion and low porosity, was achieved for all composites, owing to an efficient dispersion method. The materials were poled with two different poling procedures, and the piezoelectric coefficient d33, the relative permittivity, and the poling degree of barium titanate were followed in time. We highlighted that, although similar d33 were obtained with all types of particles, the nature of the particles surface and the poling procedure were associated with different charge trapping and influenced the evolution of d33 with time.

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BaTiO3–P(VDF-HFP) nanocomposite dielectrics—Influence of surface modification and dispersion additives

Cited by 30 publications

References 38 publications

Processing, Dynamic mechanical thermal analysis, and dielectric properties of barium titanate/cellulosic polymer nanocomposites

Processing, Dynamic mechanical thermal analysis, and dielectric properties of barium titanate/cellulosic polymer nanocomposites

Enhanced dielectric properties of sol–gel-BaTiO₃/P(VDF-HFP) composite films without surface functionalization

Interface-Dominated Time-Dependent Behavior of Poled Poly(Vinylidene Fluoride–Trifluoroethylene)/Barium Titanate Composites

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BaTiO3–P(VDF-HFP) nanocomposite dielectrics—Influence of surface modification and dispersion additives

Cited by 30 publications

References 38 publications

Processing, Dynamic mechanical thermal analysis, and dielectric properties of barium titanate/cellulosic polymer nanocomposites

Processing, Dynamic mechanical thermal analysis, and dielectric properties of barium titanate/cellulosic polymer nanocomposites

Enhanced dielectric properties of sol–gel-BaTiO3/P(VDF-HFP) composite films without surface functionalization

Interface-Dominated Time-Dependent Behavior of Poled Poly(Vinylidene Fluoride–Trifluoroethylene)/Barium Titanate Composites

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Enhanced dielectric properties of sol–gel-BaTiO₃/P(VDF-HFP) composite films without surface functionalization