Novel Ag–BaTiO3/PVDF three-component nanocomposites with high energy density and the influence of nano-Ag on the dielectric properties

Effect of Ag on the sintering and dielectric properties behavior of Bi1.5ZnNb1.5O7 ceramics

“…According to the previous reports [14][15][16][17][18][19][20][21][22][23][24][25], metal doping always leads to large dielectric loss. However, in this paper, it is interesting that the dielectric losses of the composites keep at 10 −4 level due to the well densification of the ceramics caused by the small amount of silver doping when the sintering temperature is over 900 • C, which makes these composites a promising candidate for low firing dielectric materials.…”

“…The dielectric properties can be adjusted to have permittivity from 30 to 200 and temperature coefficient of capacitance from +800 to −1300 ppm/ • C [13]. Recently, much attention has been attracted by a second method, which is based on the metal-ceramic composites [14][15][16][17][18][19][20][21]. As the volume fraction of metals or conducting phases in ceramics increases, the permittivity and conductivity increase gradually and when the volume fraction of the conductive powder reaches a critical value, the conductivity as well as permittivity of the composite increases by several orders of magnitude.…”

Polymer-based dielectrics with high permittivity for electric energy storage: A review

“…Unfortunately, polymer materials typically possess low dielectric constants as shown in Table 1, though they have a high breakdown strength. [121] Therefore, much effort has been devoted to enhance the intrinsic dielectric constants of polymer materials via modifying the polymeric chain architecture, blending polymers with different polymers, and dispersing ceramics and conducting nanoparticles into polymers. For example, the permittivity of polymethylmethacrylate (PMMA) is as low as 2.9, thus You et al applied styrene butyl-acrylate copolymer loaded reduced graphene oxide (SBA@rGO) as the conducting fillers to promote the dielectric properties of PMMA, and the results showed that permittivity of SBA@rGO/PMMA composite with only 0.14 wt% rGO was up to 15.5 at 1 kHz.…”

Improvement of β-phase crystal formation in a BaTiO3-modified PVDF membrane

“…Therefore, a lot of techniques have been adopted to increase the content of the β-phase in PVDF, among which, one of the most effective strategies is to incorporate nanofillers as the nucleating agent for the β-phase in PVDF, such as metal oxides [12][13][14], carbon nanotubes [7], hydrated salts [12,13,15], and their mixtures [16]. Ceramics like barium titanate (BaTiO 3 ) [16][17][18] and bismuth titanate (Bi 4 Ti 3 O 12 ) [19] as effective β-nucleating agents have especially attracted increasing attention, owing to their significantly higher dielectric constants (each ε′≈1×10 3 ) than the other nanofillers [20].…”

“…In order to achieve β-phase enhancement in PVDF/ ceramics nanocomposites, two core issues need to be considered: uniform dispersion of ceramics nanoparticles in the PVDF matrix and strong interfacial bonding between the ceramics and the PVDF [18,21]. In recent years, much effort has been made to obtain nanocomposites with nanoparticles' homogeneous dispersion, including surface modification by organic molecules such as rialkoxysilane [22], hydrogen peroxide [23], and hyperbranched aromatic polyamide [24], and the use of hybrid nanofillers such as siliver [17], nickel [25], and carbon material [26], and surface-initiated in situ polymerization [27,28]. However, these methods involved the usage of abundant solvents, which are unhealthy and environmentally unfriendly [29].…”