Homogeneous poly(vinylidenefluoride)-graphene films with secondary percolation behaviors towards negative permittivity properties
Source abstract
Abstract
Abstract With tunable negative permittivity, flexible and collapsible films composed of polyvinylpyrrolidone modified graphene and poly(vinylidene fluoride) were fabricated by solution casting method. Interestingly, a secondary percolation behavior was observed from σac, and two percolation thresholds ranged from 3.75 to 6.25 wt% and 12.5 to 18.75 wt%, respectively. Meanwhile, the results indicated that the obtained composite films achieved negative permittivity at a lower GR content (3.75 wt%), which was ascribed to better dispersion of the modified GR in the matrix. The negative dielectric curves could be well in accordance with Lorentz model and Drude model, respectively. It was also first discovered that different types of negative dielectric behavior corresponded well to the two percolation phenomena of σac, which was ascribed to the different microstructures.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Dielectric materials and actuators · Electromagnetic wave absorption materials · Advanced Sensor and Energy Harvesting Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (27)
Show source-provided references
1. Low percolation threshold in flexible graphene/acrylic polyurethane composites with tunable negative permittivity10.1016/j.compscitech.2017.08.011 ↗
2. Synergistic effect of graphene and carbon nanotube for high-performance electromagnetic interference shielding films10.1016/j.carbon.2018.03.023 ↗
3. Bilayer polymer metacomposites containing negative permittivity layer for new high-k materials10.1021/acsami.6b12786 ↗
4. Carbon nanospheres induced high negative permittivity in nanosilver-polydopamine metacomposites10.1016/j.carbon.2019.03.028 ↗
5. Charge transport in polycrystalline graphene: challenges and opportunities10.1002/adma.201401389 ↗
6. Mechanical abnormality in graphene-based lamellar superstructures10.1016/j.carbon.2018.05.022 ↗
7. Improved thermal conductivities in polystyrene nanocomposites by incorporating thermal reduced graphene oxide via electrospinning-hot press technique10.1016/j.coco.2018.07.003 ↗
8. Obviously improved electromagnetic interference shielding performances for epoxy composites via constructing honeycomb structural reduced graphene oxide10.1016/j.compscitech.2019.107698 ↗
9. Highly oriented three-dimensional structures of Fe3O4 decorated CNTs/reduced graphene oxide foam/epoxy nanocomposites against electromagnetic pollution10.1016/j.compscitech.2019.107683 ↗
10. Copper nanowires/thermally annealed graphene aerogel/epoxy nanocomposites with excellent thermal conductivities and outstanding electromagnetic interference shielding effectiveness10.1016/j.compositesa.2019.105670 ↗
11. Polymer-stabilized graphene dispersions at high concentrations in organic solvents for composite production10.1016/j.carbon.2011.09.008 ↗
12. In I, Role of poly(N-vinyl-2-pyrrolidone) as stabilizer for dispersion of graphene via hydrophobic interaction10.1007/s10853-010-4917-2 ↗
13. Fabrication and analysis of a highly hydrophobic and permeable block GO-PVP/PVDF membrane for membrane humidification-dehumidification desalination10.1016/j.memsci.2019.04.023 ↗
14. Mechanical and dielectric properties of MWCNT filled chemically modified SBS/PVDF blends10.1016/j.coco.2017.11.001 ↗
15. Electroactive poly(vinylidene fluoride)-based structures for advanced applications10.1038/nprot.2017.157 ↗
16. Fabrication of epoxy functionalized MWCNTs reinforced PVDF nanocomposites with high dielectric permittivity, low dielectric loss and high electrical conductivity10.1016/j.compscitech.2018.08.041 ↗
17. Polyvinylpyrrolidone modified graphene oxide as a modifier for thin film composite forward osmosis membranes10.1016/j.memsci.2017.06.070 ↗
18. Flexible PbTiO3-nanowires/P (VDF-TrFE) composite films and their dielectric, ferroelectric and pyroelectric properties10.1016/j.ceramint.2018.05.118 ↗
19. Graphene nanocomposites based on poly(vinylidene fluoride): structure and properties10.1002/pc.21106 ↗
20. Effects of reduced graphene on crystallization behavior, thermal conductivity and tribological properties of poly(vinylidene fluoride)10.1177/0021998313476526 ↗
21. Unique negative permittivity of the pseudo conducting radial zinc oxide-poly(vinylidene fluoride) nanocomposite film: enhanced dielectric and electromagnetic interference shielding properties10.1016/j.matchemphys.2015.10.010 ↗
22. Processing conditions dependent tunable negative permittivity in reduced graphene oxide-alumina nanocomposites10.1016/j.ceramint.2019.05.349 ↗
23. Significantly enhanced electroactive β phase crystallization and UV-shielding properties in PVDF nanocomposites flexible films through loading of ATO nanoparticles: synthesis and formation mechanism10.1016/j.eurpolymj.2017.02.036 ↗
24. Direct fabrication of a 3D-shape film of polyvinylidene fluoride (PVDF) in the piezoelectric β-phase for sensor and actuator applications10.1016/j.eurpolymj.2017.12.009 ↗
25. Radio frequency negative permittivity in random carbon nanotubes/alumina nanocomposites10.1039/C7NR01516J ↗
26. Tunable negative permittivity with fano-like resonance and magnetic property in percolative silver/yittrium iron garnet nanocomposites10.1021/acs.jpcc.7b02036 ↗
27. Wave propagation in media having negative permittivity and permeability10.1103/PhysRevE.64.056625 ↗