Greatly enhanced dielectric permittivity in La1.7Sr0.3NiO4/poly(vinylidene fluoride) nanocomposites that retained a low loss tangent
| Autor: | Prasit Thongbai, Keerati Meeporn, Santi Maensiri, Teerapon Yamwong |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Nanocomposite
Materials science General Chemical Engineering Nanoparticle 02 engineering and technology General Chemistry Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Polyvinylidene fluoride 0104 chemical sciences chemistry.chemical_compound chemistry visual_art Volume fraction visual_art.visual_art_medium Dissipation factor Ceramic Composite material 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | RSC Advances. 7:17128-17136 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c7ra01675a |
| Popis: | The effect of La1.7Sr0.3NiO4 nanoparticles (LSNO-NPs) on the dielectric properties of LSNO-NPs/polyvinylidene fluoride (LSNO-NPs/PVDF) composites is presented. LSNO-NPs/PVDF composites fabricated via a liquid-phase assisted dispersion and hot-pressing methods showed a homogeneous dispersion of LSNO-NPs in a PVDF polymer matrix. The dielectric permittivity (e′) continuously increased with increasing volume fraction of LSNO-NPs from fLSNO = 0–0.20, following the effective medium theory and Lichtenecker's logarithmic models. This result was intrinsically caused by a very large e′ ≈ 105 of LSNO-NPs ceramic particles. At fLSNO = 0.25, e′ deviated from the conventional mixed models, indicating a dominant extrinsic effect. A rapid change in e′ of LSNO-NPs/PVDF composites was observed when fLSNO > 0.3. A largely enhanced dielectric response with e′ ≈ 3285 at 1 kHz was obtained at fLSNO = 0.35, while the loss tangent was still low (≈0.83). This extremely enhanced e′ value is attributed to the large interfacial areas and very short interparticle distances between LSNO-NPs (≈20–30 nm) separated by a thin layer of PVDF, forming highly effective microcapacitors. The overall e′ values are well described by the combination model of effective medium percolation theory. |
| Databáze: | OpenAIRE |
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