PVDF reinforced with core–shell structured Mo@MoO3 fillers: effects of semi-conductor MoO3 interlayer on dielectric properties of composites

Core@Double–Shell Engineering of Zn Particles toward Elevated Dielectric Properties: Multiple Polarization Mechanisms in Zn@Znch@PS/PVDF Composites

“…With the rapid advancement of modern microelectronic devices toward large power, ultrahigh integration, and multifunction, dielectric materials with high dielectric permittivity (𝜖′), low loss, high dielectric breakdown strength (E b ), and good thermal DOI: 10.1002/marc.202300585 conductivity (TC), have attracted much attention in the energy storage and electrical equipment fields such as embedded film capacitors, pulse power sources, and electricity distribution. [1][2][3] Currently, conventional inorganic ceramic dielectric materials, such as Pb(Zr,Ti)O 3 (PZT), BaTiO 3 (BT), and CaCu 3 Ti 4 O 12 (CCTO), perform very high 𝜖′ and excellent high-temperature resistance, whereas, they inevitably show limited processing and low E b . [4] Compared with inorganic ceramics, polymers exhibit notable superiorities like easy processing, excellent flexibility, lightweight, and very low dielectric loss along with high E b , however, they are also restricted to rather low 𝜖′ and poor TC.…”

“…Additionally, the presence of multiple interfaces could facilitate IP subsequently leading to elevated 𝜖′ at low frequencies and promoting the contributions to 𝜖′ at highfrequency from core-shell components. [20] The large mismatch in electrical/dielectric properties between the polymer and the conductive fillers can be obviously mitigated by selecting different external shells that tailor the filler-polymer interfaces over a wide range, such as molybdenum trioxide, [2] nickel oxide, [10] aluminum nitride, [11] polystyrene (PS), poly(vinyl pyrrolidone), and others. [4,[21][22][23] In comparison to often used metals like aurum (Au), silver (Ag), copper (Cu), and nickel (Ni), zinc (Zn) is a good candidate for polymeric composite dielectrics owing to its outstanding electric conductivity, relatively high TC, and inexpensive cost.…”

“…Additionally, the presence of multiple interfaces could facilitate IP subsequently leading to elevated ε ′ at low frequencies and promoting the contributions to ε ′ at high‐frequency from core–shell components. [ 20 ] The large mismatch in electrical/dielectric properties between the polymer and the conductive fillers can be obviously mitigated by selecting different external shells that tailor the filler–polymer interfaces over a wide range, such as molybdenum trioxide, [ 2 ] nickel oxide, [ 10 ] aluminum nitride, [ 11 ] polystyrene (PS), poly(vinyl pyrrolidone), and others. [ 4,21–23 ]…”

The novel Co-doped MoO3 microwave absorber prepared by heat treatment

“…Meanwhile, due to introduction of defects, the doped α-MoO 3 can effectively increase the dipole and magnetic moment, introducing interface polarization to absorb waves by dielectric loss and magnetic loss [14]. On the other hand, α-MoO 3 has excellent semiconductor and dielectric properties [17,18]. The complex permittivity of α-MoO 3 can be modulated by means of oxygen vacancy engineering [19].…”

Effect of High-Entropy Spinel Ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 Doping Concentration on the Ferroelectric Properties of PVDF-Based Polymers

“…Ceramic materials have higher dielectric constants but tend to have lower breakdown strengths, complementing the electrical properties of polymer materials [ 35 ]. To improve the electrical properties of polymers, ceramic materials with high dielectric constants are added to polymer matrices to form ceramic/polymer composites [ 36 , 37 , 38 , 39 , 40 , 41 , 42 ].…”