Dielectric response and percolation behavior of Ni–P(VDF–TrFE) nanocomposites
Conductor–dielectric 0–3 nanocomposites using spherical nickel nanoparticles as filler and poly(vinylidene fluoride–trifluoroethylene) 70/30mol.% as matrix are prepared using a newly developed process that combines a solution cast and a hot-pressing method with a unique configuration and creates a u...
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| Format: | Article |
| Language: | English |
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World Scientific Publishing
2017-06-01
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| Series: | Journal of Advanced Dielectrics |
| Subjects: | |
| Online Access: | http://www.worldscientific.com/doi/pdf/10.1142/S2010135X17500151 |
| _version_ | 1811322253970767872 |
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| author | Lin Zhang Patrick Bass Guan Wang Yang Tong Zhuo Xu Z.-Y. Cheng |
| author_facet | Lin Zhang Patrick Bass Guan Wang Yang Tong Zhuo Xu Z.-Y. Cheng |
| author_sort | Lin Zhang |
| collection | DOAJ |
| description | Conductor–dielectric 0–3 nanocomposites using spherical nickel nanoparticles as filler and poly(vinylidene fluoride–trifluoroethylene) 70/30mol.% as matrix are prepared using a newly developed process that combines a solution cast and a hot-pressing method with a unique configuration and creates a uniform microstructure in the composites. The uniform microstructure results in a high percolation threshold φc (>55 vol.%). The dielectric properties of the nanocomposites at different frequencies over a temperature range from −70∘C to 135∘C are studied. The results indicate that the composites exhibit a lower electrical conductivity than the polymer matrix. It is found that the nanocomposites can exhibit an ultra-high dielectric constant, more than 1500 with a loss of about 1.0 at 1kHz, when the Ni content (53 vol.%) is close to percolation threshold. For the nanocomposites with 50 vol.% Ni particles, a dielectric constant more than 600 with a loss less than 0.2 is achieved. It is concluded that the loss including high loss is dominated by polarization process rather than the electrical conductivity. It is also found that the appearance of Ni particles has a strong influence on the crystallization process in the polymer matrix so that the polymer is converted from a typical ferroelectric to a relaxor ferroelectric. It is also demonstrated that the widely used relationship between the dielectric constant and the composition of the composites may not be valid. |
| first_indexed | 2024-04-13T13:31:56Z |
| format | Article |
| id | doaj.art-e30c36b99c0941d3ab6c754db1257101 |
| institution | Directory Open Access Journal |
| issn | 2010-135X 2010-1368 |
| language | English |
| last_indexed | 2024-04-13T13:31:56Z |
| publishDate | 2017-06-01 |
| publisher | World Scientific Publishing |
| record_format | Article |
| series | Journal of Advanced Dielectrics |
| spelling | doaj.art-e30c36b99c0941d3ab6c754db12571012022-12-22T02:44:55ZengWorld Scientific PublishingJournal of Advanced Dielectrics2010-135X2010-13682017-06-01731750015-11750015-810.1142/S2010135X1750015110.1142/S2010135X17500151Dielectric response and percolation behavior of Ni–P(VDF–TrFE) nanocompositesLin Zhang0Patrick Bass1Guan Wang2Yang Tong3Zhuo Xu4Z.-Y. Cheng5Materials Research and Education Center, Auburn University, Auburn AL 36849, USAMaterials Research and Education Center, Auburn University, Auburn AL 36849, USAElectronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, P. R. ChinaMaterials Research and Education Center, Auburn University, Auburn AL 36849, USAElectronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, P. R. ChinaMaterials Research and Education Center, Auburn University, Auburn AL 36849, USAConductor–dielectric 0–3 nanocomposites using spherical nickel nanoparticles as filler and poly(vinylidene fluoride–trifluoroethylene) 70/30mol.% as matrix are prepared using a newly developed process that combines a solution cast and a hot-pressing method with a unique configuration and creates a uniform microstructure in the composites. The uniform microstructure results in a high percolation threshold φc (>55 vol.%). The dielectric properties of the nanocomposites at different frequencies over a temperature range from −70∘C to 135∘C are studied. The results indicate that the composites exhibit a lower electrical conductivity than the polymer matrix. It is found that the nanocomposites can exhibit an ultra-high dielectric constant, more than 1500 with a loss of about 1.0 at 1kHz, when the Ni content (53 vol.%) is close to percolation threshold. For the nanocomposites with 50 vol.% Ni particles, a dielectric constant more than 600 with a loss less than 0.2 is achieved. It is concluded that the loss including high loss is dominated by polarization process rather than the electrical conductivity. It is also found that the appearance of Ni particles has a strong influence on the crystallization process in the polymer matrix so that the polymer is converted from a typical ferroelectric to a relaxor ferroelectric. It is also demonstrated that the widely used relationship between the dielectric constant and the composition of the composites may not be valid.http://www.worldscientific.com/doi/pdf/10.1142/S2010135X17500151Compositedielectricconductivitypercolation |
| spellingShingle | Lin Zhang Patrick Bass Guan Wang Yang Tong Zhuo Xu Z.-Y. Cheng Dielectric response and percolation behavior of Ni–P(VDF–TrFE) nanocomposites Journal of Advanced Dielectrics Composite dielectric conductivity percolation |
| title | Dielectric response and percolation behavior of Ni–P(VDF–TrFE) nanocomposites |
| title_full | Dielectric response and percolation behavior of Ni–P(VDF–TrFE) nanocomposites |
| title_fullStr | Dielectric response and percolation behavior of Ni–P(VDF–TrFE) nanocomposites |
| title_full_unstemmed | Dielectric response and percolation behavior of Ni–P(VDF–TrFE) nanocomposites |
| title_short | Dielectric response and percolation behavior of Ni–P(VDF–TrFE) nanocomposites |
| title_sort | dielectric response and percolation behavior of ni p vdf trfe nanocomposites |
| topic | Composite dielectric conductivity percolation |
| url | http://www.worldscientific.com/doi/pdf/10.1142/S2010135X17500151 |
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