Studies of the Dielectric Properties of Pvdf-Cacu3ti4o12 Composite Thin Film: Experimental and Theoretical

Ngongang, R. T.; Nwanya, Assumpta C.; Onoh, Edwin U.; Nwachukwu, Iheke Michael; Ugwuoke, Cyril O.; Atawa, B.; Abe, Martin Thierry Ottou; Ndjaka, J.M.B.; Ezema, Fabian I.

doi:10.2139/ssrn.4347544

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“…Ceramic or conductive fillers are usually introduced into polymer matrices to improve their dielectric properties. Materials with high dielectric constant, for example (Ba, Sr)TiO 3 [ 21 , 22 , 23 ], CaCu 3 Ti 4 O 12 [ 24 , 25 , 26 , 27 ], TiO 2 [ 28 , 29 , 30 ], LaFeO 3 [ 31 , 32 ], are commonly used as ceramic fillers in polymer composites [ 33 , 34 ]. A large volume fraction of ceramic filler (usually f > 50 vol.%) is needed to significantly increase the dielectric constant of composites, which inevitably leads to a loss of flexibility and difficulties in molding.…”

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confidence: 99%

Significantly Enhanced Balance of Dielectric Properties of Polyvinylidene Difluoride Three-Phase Composites by Silver Deposited on K2Ni0.93Ti7.07O16 Hollandite Nanoparticles

Tsyganov,

Vikulova,

Zotov

et al. 2024

Polymers

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Three-phase polymer composites are promising materials for creating electronic device components. The qualitative and quantitative composition of such composites has a significant effect on their functional, in particular dielectric properties. In this study, ceramic filler K2Ni0.93Ti7.07O16 (KNTO) with Ag coating as conductive additive (0.5, 1.0, 2.5 wt.%) was introduced into the polyvinylidene difluoride (PVDF) polymer matrix in amounts of 7.5, 15, 22.5, and 30 vol.%. to optimize the dielectric constant and dielectric loss tangent. The filler was characterized by X-ray phase analysis, Fourier-transform infrared spectroscopy and Scanning electron microscopy methods. The dielectric constant, dielectric loss tangent, and conductivity of three-phase composites KNTO@Ag-PVDF were studied in comparison with two-phase composites KNTO-PVDF in the frequency range from 102 Hz to 106 Hz. The dielectric constant values of composites containing 7.5, 15, 22.5, and 30 vol.% filler were 12, 13, 17.4, 19.2 for pure KNTO and 13, 19, 25, 31 for KNTO@Ag filler (2.5 wt.%) at frequency 10 kHz. The dielectric loss tangent ranged from 0.111 to 0.340 at a filler content of 7.5 to 30 vol.%. A significantly enhanced balance of dielectric properties of PVDF-based composites was found with K2Ni0.93Ti7.07O16 as ceramic filler for 1 wt.% of silver. Composites KNTO@Ag(1 wt.%)-PVDF can be applied as dielectrics for passive elements of flexible electronics.

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