Asymmetric multilayered MXene-AgNWs/cellulose nanofiber composite films with antibacterial properties for high-efficiency electromagnetic interference shielding

Mechanically Robust Fluorinated Graphene/Poly(p-Phenylene Benzobisoxazole) Nanofiber Films with Low Dielectric Constant and Enhanced Thermal Conductivity: Implications for Thermal Management Applications

“…A small amount of uniformly dispersed FG can homogenize the stress and further improve the mechanical properties of the composite film. Compared with other composite films reported in the literature, the tensile strength of the FG10/PBONF is about 2–8 times that of the aramid nanofiber composite films − and comparable to that of the cellulose nanofiber composite films. − Moreover, in our previous research, the mechanical properties of the composite films based on conventional PBO polymers decreased significantly when the FG content exceeded 1 wt %. Therefore, it is not difficult to find that the PBONF network can tolerate higher levels of nanofillers while maintaining its excellent properties compared to traditional polymer matrices.…”

Multifunctional CoFe2O4@MXene-AgNWs/Cellulose Nanofiber Composite Films with Asymmetric Layered Architecture for High-Efficiency Electromagnetic Interference Shielding and Remarkable Thermal Management Capability

“…The accordion-like MXene was fabricated according to our previous works. ,, The CoFe 2 O 4 @MXene hybrid was synthesized by a facile solvothermal method, which is schematically illustrated in Figure a. First, NaAC (3.6 g) and PEG (2.0 g) were completely dissolved in 40 mL of EG by magnetic stirring at 50 °C for 30 min.…”

“…Constructing perfect electron or phonon transfer paths in materials is essential to acquiring desirable EMI SE and TC. Although metallic materials possess high-performance EMI shielding and thermal management capability, their inherent shortcomings of high density, easy corrosion, difficult processing, and inferior flexibility tremendously constrain their practical applications. , Nowadays, conductive polymer composites (CPCs) have attracted considerable attention and have been regarded as prospective alternatives for metallic materials because of their low density, anticorrosion, facile processability, and tunable properties. ,, Nevertheless, realizing high-performance EMI shielding and superior TC for CPCs usually requires high filler loadings, which irreversibly results in a sharp deterioration of the mechanical behavior, an increased thickness, and low affordability. , Numerous studies have certified that combining dielectric and magnetic fillers could synergistically enhance the attenuation capacity of electromagnetic waves (EMW) owing to the electromagnetic double dissipation effect. − Although the electric/magnetic hybrid CPCs can significantly enhance EMI SE, it still is a daunting task to obtain high EMI shielding performance with superior EMW absorption because the regulation of impedance matching is difficult in a homogeneous structure with constant conductivity. ,, Consequently, developing CPCs with high-efficiency EMI SE entailing strong EMW absorption remains challenging.…”

“…Great efforts have been made by incorporating functional fillers such as transition metal carbides and/or nitrides (MXene), graphene nanosheets, carbon nanotubes, and silver nanowires (AgNWs) into the polymer matrix. Among them, the newly emerged two-dimensional (2D) MXene with satisfactory hydrophilicity, large specific area, metallic-like conductivity, and abundant native defects has aroused widespread attention in the EMI shielding field. − Meanwhile, AgNWs are widely used to construct CPCs with notable EMI SE and TC owing to their ultrahigh aspect ratio, brilliant electrical conductivity, remarkable heat transfer, and excellent mechanical characteristics. ,,− The design of an asymmetrical structure could combine the advantages of individual components fully and control the distribution of functional filler in a special layer, which can eliminate the restriction of the nonadjustable reflection feature in EMI shielding materials with fixed impedance matching. In addition, the asymmetrical architecture presents versatility owing to the different chemical compositions and microscopic morphologies on two sides. ,− Consequently, the construction of an asymmetric layered structure may be an ideal approach to obtaining multifunctional CPCs with high-efficiency EMI SE entailing strong EMW absorption and superior thermal management capability simultaneously.…”

“…12,13 Nowadays, conductive polymer composites (CPCs) have attracted considerable attention and have been regarded as prospective alternatives for metallic materials because of their low density, anticorrosion, facile processability, and tunable properties. 3,14,15 Nevertheless, realizing high-performance EMI shielding and superior TC for CPCs usually requires high filler loadings, which irreversibly results in a sharp deterioration of the mechanical behavior, an increased thickness, and low affordability. 16,17 Numerous studies have certified that combining dielectric and magnetic fillers could synergistically enhance the attenuation capacity of electromagnetic waves (EMW) owing to the electromagnetic double dissipation effect.…”