Abstract:Summary: This study examines the use of a PMMA‐mediated assembly of BaTiO3 nanoparticles directly onto Cu electrodes under an electric field. The compatibility of the interface between BaTiO3 nanoparticles and PMMA in a mixed organic solvent system enables the homogeneous dispersion of nanoparticles in a solid polymer matrix. This results in the effective packing of particles, which is desirable from the point of view of achieving a high dielectric constant in the composite. In this study, three‐phase Al/BaTiO… Show more
“…5. The dissipation factor scarcely varies in the range of nanoparticle contents examined, which is similar to the result of Kim et al 33 and slightly different from that of Kim et al 32 and Li et al 34 The different trends of dissipation factor might be caused by the difference in the agents used for surface modification of BT nanoparticles. The dielectric constant shown in Fig.…”
Incorporation of crystalline barium titanate (BT) nanoparticles into poly(methyl methacrylate) (PMMA) was carried out to prepare highly refractive polymer nanocomposite films that have transparency and high permittivities. The BT nanoparticles were prepared by hydrolysis of a barium/titanium complex alkoxide in 2-methoxyethanol, then surface-modified with a silane coupling agent (3-methacryloxypropyltrimethoxysilane) to improve their affinity for PMMA. The incorporation of the surface-modified nanoparticles into PMMA was performed up to a nanoparticle content almost equivalent to particle closepacking state. The refractive index of the composite films increased with nanoparticle incorporation, keeping the relative transmittance normalized with PMMA film above 90%. A high refractive index of 1.82 was reached at a nanoparticle content of 53 vol% with a dielectric constant as high as 36 and a dissipation factor as low as 0.05. The results demonstrate that the crystalline BT nanoparticles are useful fillers for effectively increasing both refractive index and dielectric constant of polymer nanocomposites.
“…5. The dissipation factor scarcely varies in the range of nanoparticle contents examined, which is similar to the result of Kim et al 33 and slightly different from that of Kim et al 32 and Li et al 34 The different trends of dissipation factor might be caused by the difference in the agents used for surface modification of BT nanoparticles. The dielectric constant shown in Fig.…”
Incorporation of crystalline barium titanate (BT) nanoparticles into poly(methyl methacrylate) (PMMA) was carried out to prepare highly refractive polymer nanocomposite films that have transparency and high permittivities. The BT nanoparticles were prepared by hydrolysis of a barium/titanium complex alkoxide in 2-methoxyethanol, then surface-modified with a silane coupling agent (3-methacryloxypropyltrimethoxysilane) to improve their affinity for PMMA. The incorporation of the surface-modified nanoparticles into PMMA was performed up to a nanoparticle content almost equivalent to particle closepacking state. The refractive index of the composite films increased with nanoparticle incorporation, keeping the relative transmittance normalized with PMMA film above 90%. A high refractive index of 1.82 was reached at a nanoparticle content of 53 vol% with a dielectric constant as high as 36 and a dissipation factor as low as 0.05. The results demonstrate that the crystalline BT nanoparticles are useful fillers for effectively increasing both refractive index and dielectric constant of polymer nanocomposites.
“…. The dissipation factor scarcely increases in the range of nanoparticle content examined, which is similar to the result of Kim et al and our previous report, whereas it is slightly different from that of Kim et al who employed BT nanoparticles surface modified with pentafluorobenzyl phosphonic acid. The dielectric constant in Fig.…”
“…All three composite films show a very homogeneous microstructure and distribution of the particles. BST and PMMA are expected to show good physical interactions and can form a network-like structure during drying 52–54 . Therefore, no clustering of the BST or PMMA was observed and only a very small porosity was identified by optical analysis.Figure 7Cross sectional SEM images of fully printed capacitors based on BST dispersion D1; ( a ) Ink A1 (67 vol% BST); ( b) Ink B1 (50 vol% BST); ( c ) Ink C1 (33 vol% BST).…”
The preparation of fully inkjet printed capacitors containing ceramic/polymer composites as the dielectric material is presented. Therefore, ceramic/polymer composite inks were developed, which allow a fast one-step fabrication of the composite thick films. Ba0.6Sr0.4TiO3 (BST) is used as the ceramic component and poly(methyl methacrylate) (PMMA) as the polymer. The use of such composites allows printing on flexible substrates. Furthermore, it results in improved values for the permittivity compared to pure polymers. Three composite inks with varying ratio of BST to PMMA were used for the fabrication of composite thick films consisting of 33, 50 and 66 vol% BST, respectively. All inks lead to homogeneous structures with precise transitions between the different layers in the capacitors. Besides the microstructures of the printed thick films, the dielectric properties were characterized by impedance spectroscopy over a frequency range of 100 Hz to 200 kHz. In addition, the influence of a larger ceramic particle size was investigated, to raise permittivity. The printed capacitors exhibited dielectric constants of 20 up to 55 at 1 kHz. Finally, the experimental results were compared to different theoretical models and their suitability for the prediction of εcomposite was assessed.
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