Graphite nanoplatelets and/or barium titanate/polymer nanocomposites: fabrication, thermomechanical properties, dielectric response and energy storage

Patsidis, Anastasios C.; Kalaitzidou, Kyriaki; Anastassopoulos, D.L.; Vradis, Alexandros A.; Psarras, G. C.

doi:10.1080/22243682.2014.937742

Cited by 16 publications

(5 citation statements)

References 23 publications

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“…No splitting of the peaks suggests a cubic lattice structure for the ceramic, without piezoelectric properties [79,80]. The literature also reports nanosized BTO particles (<200 nm) with a cubic lattice structure [38,81,82], and in this study we used ≈122 nm BTO particles, further proving the possibility of no piezoelectric effect occurring in the BTO ceramic used in this study. The XRD pattern of the KNN3.5 particles, on the other hand, shows similarities to orthorhombic KNN patterns reported in the literature [68,70,[83][84][85], which have piezoelectric properties.…”

Section: Results and Discussion (Ceramic And Solvent Investigation)supporting

confidence: 55%

Piezoelectric Ceramic/Photopolymer Composites Curable with UV Light: Viscosity, Curing Depth, and Dielectric Properties

Mitkus

Sinapius

2022

J. Compos. Sci.

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Four piezoelectric ceramic materials with varying particle sizes and geometries are added up to 30 vol.% to a photopolymer resin to form UV-curable piezoelectric composites. Such composites solidify in a few minutes, can be used in UV-curing-based 3D printing processes, and can achieve improved sensor performance. The particle dispersion with ultrasonication shows the most homogeneous particle dispersion with ethanol, while two other solvents produced similar results. The viscosities of the prepared suspensions show some dependency on the particle size. The curing depth results show a strong dependency on the ceramic particle size, the difference in refractive index, and the particle size distribution, whereby composites filled with PZT produced the worst results and composites filled with KNN produced the highest curing depths. The SEM images show a homogeneous dispersion of ceramic particles. The highest dielectric properties are also shown by KNN-filled composites, while BTO and PZT produced mixed results of dielectric constants and dielectric losses. KNN-filled composites seem to be very promising for further 3D-printable, lead-free piezoelectric composite development.

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Section: Results and Discussion (Ceramic And Solvent Investigation)supporting

confidence: 55%

Piezoelectric Ceramic/Photopolymer Composites Curable with UV Light: Viscosity, Curing Depth, and Dielectric Properties

Mitkus

Sinapius

2022

J. Compos. Sci.

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“…As expected 1 ′ increases with filler content in the whole frequency range, since BaTiO 3 nanocomposites exhibit higher values of permittivity than the polymer matrix [25]. This increase is more noticeable at low frequencies, because as the filler content increases, system's heterogeneity also increases, leading to enhanced IP effect.…”

Section: Dielectric Responsesupporting

confidence: 62%

Energy storage and harvesting in BaTiO ₃ /epoxy nanodielectrics

Manika¹,

Psarras²

2016

High Voltage

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Composite nanodielectrics consisted of an epoxy resin and barium titanate nanoparticles were developed and characterised. Electrical measurements were performed via broadband dielectric spectroscopy. Dielectric results reveal the presence of three relaxation processes, which are attributed to (a) glass to rubber transition of the polymer matrix (α-mode), (b) rearrangement of polar side groups (β-mode) and (c) interfacial polarisation between system's constituents. The ability of the examined nanodielectrics to store and harvest energy was also examined in dc conditions. Applied dc voltage varied in the range of 10-240 V. Experimental data indicate that increasing the applied dc field results to higher values of the stored and harvested energies. The energy efficiency was also investigated in all specimens. The filler content enhances the coefficient of energy efficiency (n eff) up to 58.2% for the 7 phr BaTiO 3 nanocomposite at 200 V and 10 s charging/discharging time.

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“…Similarly, Figure 3c,d shows the evidences of CBT nanoparticles were formed in a narrow size distribution with average particle size of ~10–20 nm, in addition to the presence of least amount of spherical‐shaped agglomerations in both CBT and CBT‐GNP samples, and the randomly attached GNP sheets within the CBT nanoparticles matrix (Figure 3d). Moreover, random, efficient distributions of BT/CBT nanoparticles alongside and over the GNP surfaces were observed due to the bonding interactions of functional groups (−OH and –COOH groups) of GNP with BT/CBT 24 . Figure 3e,f shows the elemental mapping and energy dispersive spectrum (EDS) of the CBT‐GNP composite, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In this regard, graphene nanoplatelets (GNP) considered as one of the cost‐effective graphene‐based nanomaterials which are composed of several graphene sheets with nanoscopic thickness of 5–10 nm, having a high aspect ratio and large surface area, good electrical conductivity, superior thermal stability, and electrocatalytic activity. Also, combinations of BT and GNP in different proportions within a polymer matrix have exhibited higher values of dielectric constant than the bare polymer matrix when tested in several polymer nanocomposites 23–25 . However, BT nanoparticles based ceramics doped with Co and or GNP synthesized via a simple hydrothermal method and their dielectric studies reported in the literature are scarce.…”

Section: Introudctionmentioning

confidence: 99%

Hydrothermal synthesis, dielectric properties of barium titanate, cobalt doped barium titanate, and their graphene nanoplatelet composites

Baiju

Nagarajan

Sadasivam

et al. 2020

Asia-Pacific J Chem Eng

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In this work, pure barium titanate (BT) and cobalt doped barium titanate (CBT) were synthesized by using barium chloride, tetrabutyl titanate, cobalt chloride, and titanium chloride as precursors via a two-step hydrothermal process. These precursor mixtures were further blended with a dispersion of surfactant + graphene nanoplatelets (GNP) judiciously during the second step of hydrothermal process to obtain their respective BT-GNP and CBT-GNP nanocomposites. The morphological and crystal structures of BT, CBT, BT-GNP, and CBT-GNP samples were analyzed by the powder XRD, and FESEM revealed that the formations of 10-to 30-nm-sized cubic phase BT, CBT nanoparticles with least amount of agglomerations, and more spherically shaped particles in the CBT, whereas their nanocomposite morphologies and compositional elemental mapping showed random distributions of BT and CBT particles over the GNP. The FT-IR analysis indicated the presence of strong chemical interactions between the nanoparticles and GNP sheets in both the BT-GNP and CBT-GNP nanocomposites. Furthermore, the dielectric measurements carried out on the BT, CBT, BT-GNP, and CBT-GNP samples showed tremendous influences of metal doping and GNP on the BT which can support to tune its dielectric properties for several storage applications. K E Y W O R D S barium titanate, cobalt doping, nanocomposite, dielectric property, graphene nanoplatelets 1 | INTROUDCTION Barium titanate (BT) is a widely studied electroceramic material for various device applications such as capacitors, memory storage devices, thermistors, piezoelectric transducers, and sensors due to its excellent dielectric, piezoelectric, and ferroelectric properties. 1-6 In recent years, improving the dielectric, ferroelectric, and ferromagnetic properties of BT ceramics by doping with metals and oxide additives has attracted a great deal of research interests for their use in increasing the performance of several electronic devices. 4,5 Usually, the BT powders are synthesized by a number of leading routes, for instance, sol-gel, 7 coprecipitation, 8 hydrothermal, 9,10 Pechini, and electrochemical methods. 11 The metal doping in BT ceramics is achieved via the methods such

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Graphite nanoplatelets and/or barium titanate/polymer nanocomposites: fabrication, thermomechanical properties, dielectric response and energy storage

Cited by 16 publications

References 23 publications

Piezoelectric Ceramic/Photopolymer Composites Curable with UV Light: Viscosity, Curing Depth, and Dielectric Properties

Piezoelectric Ceramic/Photopolymer Composites Curable with UV Light: Viscosity, Curing Depth, and Dielectric Properties

Energy storage and harvesting in BaTiO ₃ /epoxy nanodielectrics

Hydrothermal synthesis, dielectric properties of barium titanate, cobalt doped barium titanate, and their graphene nanoplatelet composites

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Graphite nanoplatelets and/or barium titanate/polymer nanocomposites: fabrication, thermomechanical properties, dielectric response and energy storage

Cited by 16 publications

References 23 publications

Piezoelectric Ceramic/Photopolymer Composites Curable with UV Light: Viscosity, Curing Depth, and Dielectric Properties

Piezoelectric Ceramic/Photopolymer Composites Curable with UV Light: Viscosity, Curing Depth, and Dielectric Properties

Energy storage and harvesting in BaTiO 3 /epoxy nanodielectrics

Hydrothermal synthesis, dielectric properties of barium titanate, cobalt doped barium titanate, and their graphene nanoplatelet composites

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Energy storage and harvesting in BaTiO ₃ /epoxy nanodielectrics