Home > Collections > NSTDA's Research Publications > Greatly enhanced dielectric permittivity in La1.7Sr0.3NiO4/poly(vinylidene fluoride) nanocomposites that retained a low loss tangent
Khon Kaen University; Khon Kaen University; National Science & Technology Development Agency - Thailand; National Metal & Materials Technology Center (MTEC); Suranaree University of Technology
Type
Article
Source Title
RSC ADVANCES
ISSN
2046-2069
Year
2017
Volume
7
Issue
28
Page
17128-17136
Open Access
gold
Publisher
ROYAL SOC CHEMISTRY
DOI
10.1039/c7ra01675a
Format
PDF
Abstract
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 (epsilon') continuously increased with increasing volume fraction of LSNO-NPs from f(LSNO) = 0-0.20, following the effective medium theory and Lichtenecker's logarithmic models. This result was intrinsically caused by a very large epsilon' approximate to 10(5) of LSNO-NPs ceramic particles. At f(LSNO) = 0.25, 30 epsilon' deviated from the conventional mixed models, indicating a dominant extrinsic effect. A rapid change in epsilon' of LSNO-NPs/PVDF composites was observed when f(LSNO) > 0.3. A largely enhanced dielectric response with epsilon' z 3285 at 1 kHz was obtained at f(LSNO) > 0.35, while the loss tangent was still low (approximate to 0.83). This extremely enhanced epsilon' value is attributed to the large interfacial areas and very short interparticle distances between LSNO-NPs (z20-30 nm) separated by a thin layer of PVDF, forming highly effective microcapacitors. The overall 30 values are well described by the combination model of effective medium percolation theory.
Funding Sponsor
Thailand Research Fund (TRF), Thailand; Khon Kaen University, Thailand [RSA5880012]; Thailand Research Fund through the Royal Golden Jubilee PhD Program [PHD/0191/2556]
License
CC BY-NC
Rights
Publisher
Publication Source
WOS
Document
Greatly enhanced dielectric permittivity in La1.7Sr0.3NiO4poly(vinylidene fluoride) nanocomposites that retained a low loss tangent