Suppressing loss tangent with significantly enhanced dielectric permittivity of poly(vinylidene fluoride) by filling with Au-Na1/2Y1/2Cu3Ti4O12 hybrid particles

Pornsawan Kum-Onsa; Nutthakritta Phromviyo; Prasit Thongbai

doi:10.1039/d0ra06980a

Suppressing loss tangent with significantly enhanced dielectric permittivity of poly(vinylidene fluoride) by filling with Au-Na_1/2Y_1/2Cu₃Ti₄O₁₂ hybrid particles

RSC Adv. 2020 Nov 6;10(66):40442-40449. doi: 10.1039/d0ra06980a. eCollection 2020 Nov 2.

Authors

Pornsawan Kum-Onsa¹, Nutthakritta Phromviyo², Prasit Thongbai^{3

4}

Affiliations

¹ Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand.
² Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University Khon Kaen 40002 Thailand.
³ Department of Physics, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand pthongbai@kku.ac.th.
⁴ Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), NANOTEC-KKU RNN on Nanomaterials Research and Innovation for Energy, Khon Kaen University Khon Kaen 40002 Thailand.

Abstract

Three-phase gold nanoparticle-Na_1/2Y_1/2Cu₃Ti₄O₁₂ (Au-NYCTO)/poly(vinylidene fluoride) (PVDF) composites with 0.095-0.487 hybrid particle volume fractions (f) were fabricated. Au nanoparticles with a diameter of ∼10 nm were decorated on the surfaces of high-permittivity NYCTO particles using a modified Turkevich's method. The polar β-PVDF phase was confirmed to exist in the composites. Significantly enhanced dielectric permittivity of ∼98 (at 1 kHz) was obtained in the Au-NYCTO/PVDF composite with f _Au-NYCTO = 0.487, while the loss tangent was suppressed to 0.09. Abrupt changes in the dielectric and electrical properties, which signified percolation behavior, were not observed even when f _Au-NYCTO = 0.487. Using the effective medium percolation theory model, the percolation threshold (f _c) was predicted to be at f _Au-NYCTO = 0.69, at which f _Au was estimated to ∼0.19 and close to the theoretical f _c value for the conductor-insulator composites (f _c = 0.16). A largely enhanced dielectric response in the Au-NYCTO/PVDF composites was contributed by the interfacial polarization effect and a high permittivity of the NYCTO ceramic filler. Au nanoparticles can produce the local electric field in the composites, making the dipole moments in the β-PVDF phase and NYCTO particles align with the direction of the electric field.