Lee, Yun Jae Kim, Jung Hyuk Ham, Sora Ju, Byeong-Kwon Choi, Won Kook 2024-01-19T22:03:44Z 2024-01-19T22:03:44Z 2021-09-03 2018-08 2158-3226 https://pubs.kist.re.kr/handle/201004/121087 Highly dispersible nanospring single-walled carbon nanotubes (NS-CNTs) were incorporated in a P(VDF-TrFE) copolymer with up to 15 wt.% of nanofiller. The relative dielectric constant (K) of the polymer nanocomposite at 1 kHz was greatly enhanced from 12.7 to 62.5 at 11 wt.% of NS-CNTs, corresponding to a 492% increase over that of pristine P(VDF-TrFE) with only a small dielectric loss tangent (D) of 0.1. Based on two theoretical models, the Bruggeman equation and self-consistent effective medium theory (SC-EMT), experimental permittivity data for the P(VDF-TrFE) and NS-CNTs nanocomposites were simulated to estimate the dielectric constant of the NS-CNTs while changing both the shape of the nanofillers and the volume fraction of the interface when increasing the number of NS-CNTs in piled layers of P(VDF-TrFE). The number of NS-CNTs layers was counted from HR-TEM images to calculate the interfacial volume fraction, and used to infer the Eshelby tensor of the NS-CNTs in the SC-EMT model. The experimental dielectric constants of the composite films fit the Bruggeman equation and SC-EMT theory well for dielectric constants k=240-360, showing that the NS-CNTs nanofillers may be considered electrically semiconductive. (c) 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license English AMER INST PHYSICS POLY(VINYLIDENE FLUORIDE) COMPOSITES POLARIZATION Modeling large permittivity of poly(vinylidenefluoride-co-trifluoroethylene) and nanospring single-walled carbon nanotube-polyvinylpyrrolidone nanocomposites Article 10.1063/1.5036573 1 AIP ADVANCES, v.8, no.8 AIP ADVANCES 8 8 scie scopus 000443722300040 2-s2.0-85052299357 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article POLY(VINYLIDENE FLUORIDE) COMPOSITES POLARIZATION PVDF-TrFE nanospring CNTs dielectric constant Bruggeman self-consistent effective mediul theory