Enhanced dielectric properties of PVDF/CaCu 3 Ti 4 O 12 :Ag composite films

Ghosh, B.; Calderón, Rocio M. Tamayo; Espinoza-González, Rodrigo; Hevia, Samuel A.

doi:10.1016/j.matchemphys.2017.05.009

Cited by 23 publications

(13 citation statements)

References 47 publications

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“…A maximum increment of 25% in melting enthalpy was obtained with only 15 wt% nano hBN filled PEEK composites. This enhancement in enthalpy indicated an improved composite crystallinity, which was estimated from the following equation [41]:…”

Section: Resultsmentioning

confidence: 99%

Thermally conductive poly(ether ether ketone)/boron nitride composites with low coefficient of thermal expansion

Ghosh

Hou

2021

J Mater Sci

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The substantial heat generation due to miniaturization and high-degree integration of electronic devices is one of the major issues to facilitate efficient thermal management in power electronics. Though epoxy-based composites have shown great interest in different applications such as laminated circuit board, electronic component encapsulations, and potting, they have low application temperature (up to 150 °C) and higher mismatch of coefficient of thermal expansion (CTE) between the heat source and heat sink. Here, poly(ether ether ketone) (PEEK) composites reinforced with hexagonal boron nitride (hBN) nanoplatelets have been developed by liquid mixing and re-melting method for a step change in composite materials with lower CTE and significantly improved thermal dissipation capability. The lowest achieved CTE is 2.1 µm m−1 K−1, and the highest thermal conductivity is 1.04 W m−1 K−1 in PEEK/hBN composites at 30 wt% hybrid hBN content (hBN platelets with two different sizes, i.e. 70 nm and 500 nm, taken as 1:1 weight ratio), due to the formation of thermally conductive inter-filler networks. The composites show negligible variation in K with the working temperature up to 250 °C. The developed composites also exhibit excellent electrical insulation properties; thus, they will have good potential in thermal management for power electronic applications. Graphical abstract

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Section: Resultsmentioning

confidence: 99%

Thermally conductive poly(ether ether ketone)/boron nitride composites with low coefficient of thermal expansion

Ghosh

Hou

2021

J Mater Sci

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“…These composites have high dielectric constant and negligible dielectric loss, which was 20% higher than that of the unmodified P/C: 30 composites. Thus, these types of work could be provided a better promising candidate of high performance polymer composites for energy storage applications [80].…”

Section: Figure 2 Thermal Conductivity Of (A) Al 2 O 3 -Ag Nps-epoxy Composites As a Function Of Ag Contents (B) Variation Of Thermal Conmentioning

confidence: 99%

Synthesis, Dielectric and Electrical Properties of Silver-Polymer Nanocomposites

Gadtya¹,

Nayak²,

Mahaling³

2021

Silver Micro-Nanoparticles - Properties, Synthesis, Characterization, and Applications

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Metallic nanoparticles and its composites have emerged as valuable asset in all phases of material science and engineering including electronic, optics and electromagnetic domains. Silver nanoparticles (Ag NPs) are one of the most vital and fascinating nanomaterials among several metallic nanoparticles due to its large surface ratio and outstanding properties with diverse field of potential applications. We demonstrated various synthesis techniques of nanocomposites, silver nanoparticles and composite based on these particles have shown great importance because of the remarkable properties (high electrical and thermal conductivity, good chemical stability and catalytic properties) of silver nanoparticles. This chapter provides various synthesis techniques for preparation of silver nanoparticles and their composites with dielectric and electrical properties in a lucid manner. The detail discussions of silver-polymer nanocomposites, emphasizing on each individual synthesis routes and properties have been carried out.

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“…In such composites, multiple material combinations and micro/nanostructures and fillers with different shapes and sizes or improvements in processing were reported to enhance the permittivity and piezoelectric response and to improve the electrostatic energy storage capacity and mechanical or pyroelectric harvesting character [7][8][9][10][11]. Since the effective permittivity, piezoelectric, and ferroelectric properties were still low and the further increase of inorganic filler amount would induce poor mechanical performance (reduced flexibility and brittle character), the use of hybrid oxidemetallic nanoparticle admixtures emerged as a possible solution for a further improvement of their functional characteristics [12][13][14][15]. Permittivity as high as ~50-150 was reported for over-percolated compositions [16,17], but such values are produced as a result of the slow Maxwell Wagner uncompensated interface charges contribution and they are typical for low frequencies only (below 100 Hz).…”

Section: Introductionmentioning

confidence: 99%

Increasing Permittivity and Mechanical Harvesting Response of PVDF-Based Flexible Composites by Using Ag Nanoparticles onto BaTiO3 Nanofillers

et al. 2022

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The role of Ag addition on the structural, dielectric, and mechanical harvesting response of 20%(xAg-(1-x)BaTiO3)-80%PVDF (x = 0, 2, 5, 7 and 27 vol.%) flexible composites is investigated. The inorganic fillers were realized by precipitating fine (~3 nm) silver nanoparticles onto BaTiO3 nanoparticles (~60 nm average size). The hybrid admixtures with a total filling factor of 20 vol.% were embedded into the PVDF matrix. The presence of filler enhances the amount of β-PVDF polar phase and the BaTiO3 filler induces an increase of the permittivity from 11 to 18 (1 kHz) in the flexible composites. The addition of increasing amounts of Ag is further beneficial for permittivity increase; with the maximum amount (x = 27 vol.%), permittivity is three times larger than in pure PVDF (εr~33 at 1 kHz) with a similar level of tangent losses. This result is due to the local field enhancement in the regions close to the filler-PVDF interfaces which are additionally intensified by the presence of silver nanoparticles. The metallic addition is also beneficial for the mechanical harvesting ability of such composites: the amplitude of the maximum piezoelectric-triboelectric combined output collected in open circuit conditions increases from 0.2 V/cm2 (PVDF) to 30 V/cm2 for x = 27 vol.% Ag in a capacitive configuration. The role of ferroelectric and metallic nanoparticles on the increasing mechanical-electric conversion response is also been explained.

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Enhanced dielectric properties of PVDF/CaCu 3 Ti 4 O 12 :Ag composite films

Cited by 23 publications

References 47 publications

Thermally conductive poly(ether ether ketone)/boron nitride composites with low coefficient of thermal expansion

Thermally conductive poly(ether ether ketone)/boron nitride composites with low coefficient of thermal expansion

Synthesis, Dielectric and Electrical Properties of Silver-Polymer Nanocomposites

Increasing Permittivity and Mechanical Harvesting Response of PVDF-Based Flexible Composites by Using Ag Nanoparticles onto BaTiO3 Nanofillers

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