“Host-Guest” crystalline Mo/Co-framework induced phase-conversion of MoCx in carbon hybrids for regulating absorption of electromagnetic wave

In‐Situ Fabrication of Sustainable‐N‐Doped‐Carbon‐Nanotube‐Encapsulated CoNi Heterogenous Nanocomposites for High‐Efficiency Electromagnetic Wave Absorption

“…Magnetic materials, with high saturation magnetization, low coercivity, and high permeability, exhibit a significant magnetic loss behavior, which can not only optimize the impedance matching of conductive absorbers, but also enhance the dissipation ability to EMWs. [16,17] However, magnetic metals, especially for nano-or microscale magnetic metal particles, are easily oxidized and prone to agglomeration, which degrades the attenuation capability to EMWs. Even if alloying strategy [18][19][20] can improve the oxidation resistance due to high Curie temperature, challenges also exist in constructing robust, stable, and durable magnetic composites.…”

A review on MXene-based microwave absorption composites: engineering, component optimization and structure regulation

“…Since alkaline elements and the amphiphilic element Al have an extremely strong binding capacity, it is theoretically feasible to etch the Al element of the A layer in MAX using alkaline solutions. 70 High-temperature and concentrated NaOH can easily etch Ti 3 AlC to form fluorine-free MXene, 71 and the absence of fluorine provides more hydroxyl and oxygen termini to facilitate subsequent surface modification treatments. Additionally, the substitution of Al atoms with hydroxyl groups enables the formation of two-dimensional Ti 3 C 2 (OH) 2 nanoflakes with large lateral dimensions.…”

State-of-the-art in carbides/carbon composites for electromagnetic wave absorption

“… 265 Huang’s group manipulated β - and η -phases of molybdenum carbide with different guest clusters (MoO 4 and PMo 12 ) in the precursors, and concluded that η -MoC might be helpful for stronger RL and broader EAB. 268 However, these temporary conclusions cannot serve as the final conclusions yet to guide the fabrication of molybdenum carbide/carbon composites, because they are not based on a strict and systematical comparison, where the influences of carbon content and graphitization degree have not been excluded completely. That is to say, the phase engineering for molybdenum carbide/carbon composites is still a rather challenging task in the following studies.…”

“…The third way usually excludes carbides with large particle size (i.e., SiC and MXene), and the mixture of MOFs/metal oxides or MOFs/polyoxometalates will be taken as the precursors, and thus it is a quite flexible route for microstructure design. 249 , 268 , 304 , 326 , 327 , 328 Ji’s group pioneered the synthesis of Mo 2 C/Co@C through the transformation of MoO 3 @ZIF-67, and optimized EM absorption performance (RL: −48.0 dB, EAB: 6.0 GHz) of final composites by the pyrolysis temperature. 304 Huang et al.…”