Poly(phenylene oxide) (PPO) is a promising resin matrix for high-frequency packaging, owing to its outstanding dielectric properties and high glass transition temperature (~210 °C). However, the abundant rigid phenyl ring structures restrict chain segment mobility, resulting in intrinsic brittleness and inferior processability. Furthermore, PPO exhibits a relatively high coefficient of thermal expansion (CTE, 76 ppm/°C), which restricts its application in advanced dielectric composites demanding high thermal dimensional stability. Although hydrogenated styrene-butadiene-styrene block copolymer (SEBS) and inorganic fillers have been incorporated into PPO to improve toughness and reduce CTE, respectively, weak interfacial bonding in such ternary systems often causes increased dielectric loss and degraded mechanical performance. Herein, we proposed an interfacial regulation strategy based on carbon-carbon double-bond reactions. PPO was first end-capped with styryl groups to obtain crosslinkable styryl-terminated poly(phenylene oxide) (SPPO), and vinyl groups were grafted onto the silica surface to produce functionalized silica (f–SiO₂). During curing, free-radical polymerization of the double bonds generated covalent linkages between the SPPO/SEBS matrix and f–SiO₂. Consequently, a stable chemically bonded interface and a three-dimensional crosslinked network were constructed between the resin phase and the filler phase, thus effectively resolving the interfacial mismatch issue in the ternary composite system. The as-fabricated dielectric composites exhibited a low dielectric constant (Dk = 2.65) and low dielectric loss (Df = 2.58 × 10^–3) at 10 GHz, as well as a low z-direction coefficient of thermal expansion (CTE = 27 ppm/℃) and excellent thermal stability.

The thermal conductivity of dielectric polymers is expected to be improved by high thermal conductivity fillers to meet the demand for thermal management materials in high power electronics and integrated circuits. Though, graphene exhibits the remarkable thermal conductivity, its inherent electrical conductivity and the poor interfacial phonon coupling with the polymer matrix restrict its application as filler for the thermal conductive dielectric composites. Herein, we demonstrate fluorinated graphene (FG) as a dual-functional filler to overcome the graphene’s drawbacks of high electrical conductivity and poor interfacial compatibility, with its high thermal conductivity remaining. The results show that the interfacial thermal resistance between FG and matrix can be reduced through interfacial interaction. In addition, FG induces the in-plane orientation of poly(vinylidene fluoride) (PVDF) molecular chains to accelerate heat dissipation. The composite film with only 5 wt.% FG content exhibits extremely high thermal conductivity (6.8 W·m⁻¹·K⁻¹), which is 30 times higher than the pristine PVDF film. This work provides new ideas for fabricating thermally conductive dielectric composites, paving the way for next-generation dielectric thermal management materials in 5G/6G microelectronics.

The generation and manipulation of spin-polarized electrons at room temperature are essential for the development of advanced spin-optoelectronic devices. In this work, a one-pot method was used to successfully synthesize homogenous Mn:CsPbBr₃ perovskite quantum dots in air with particle sizes of 7−8 nm. The effects of Mn doping on the structure, optical and magnetic properties of CsPbBr₃ quantum dots were investigated. The findings demonstrated proper Mn doping improved the crystallinity and photoluminescence (PL) of quantum dots. The prepared quantum dots have a narrow full width at half maximum emission (FWHM) of about 17−20 nm. The magnetic properties of the doped samples and the effect of the magnetic field on the PL spectra properties were analyzed. The results show that trace Mn doping can improve the room-temperature ferromagnetism of CsPbBr₃ quantum dots. Doping with magnetic elements makes CsPbBr₃ quantum dots more responsive to the applied magnetic field. Even at a lower 50 mT magnetic field, the PL peak of Mn:CsPbBr₃ still declined 5.91%. Mn:CsPbBr₃ quantum dots are a new type of multifunctional material that is beneficial to spintronics research. This work demonstrates a low-cost synthesis method. It should make all-inorganic perovskite quantum dots a promising material for room-temperature spin optoelectronic devices.

The perturbation in the magnetic field generated by the rotation or oscillation of magnetic domains in magnetic materials can emit low-frequency electromagnetic waves, which are expected to be used in low-frequency communications. However, the magnetic emission intensity, defined by the perturbation ability, of current commercially applied amorphous alloys, such as Metglas, cannot meet the application requirements for low-frequency antennas due to the domain motion energy loss. Herein, a multi-phase Metglas amorphous alloy was constructed by incorporating α-Fe nanocrystals using rapid annealing to manipulate the domain movement. It was found that 3.89 times higher magnetic emission intensity is obtained compared to the pristine due to the synergism of the deformation and displacement mechanisms. Moreover, the low-frequency magnetic emission performance verification was carried out by preparing magnetoelectric composites as the antenna vibrator by assembling the alloy and macro piezoelectric fiber composites (MFC). Enhancements of magnetic emission intensity are found at 93.3% and 49.2% at the first and second harmonic frequencies compared with the unmodified alloy vibrator. Therefore, the approach leads to the development of high-performance communication with a novel standard for evaluation.