Multifunctional three-dimensional porous MOFs derived Fe/C/carbon foam for microwave absorption, thermal insulation and infrared stealth

Lightweight Porous Carbon Foams via Pyrolysis of Robust Polyimide Foams for Efficient Broadband Microwave Absorption

“…Meanwhile, the micrometer-scale cell size was much smaller than the natural convection size, which further reduced the thermal convection. Furthermore, the porous skeleton could lengthen the heat transfer path, thus reducing the thermal conductivity (Figure b). − The low thermal conductivity contributes to reducing the infrared radiation intensity, endowing materials with an infrared stealth performance. As a result, the CPIFs exhibited excellent infrared stealth and thermal insulation properties, making them remarkably promising for applications in high-temperature protection.…”

Construction of Hierarchical Yolk–Shell Co/N-Dope C@void@C@MoS2 Composites with Multiple Heterogeneous Interfaces toward Broadband Electromagnetic Wave Absorption

“…Figure 9e shows that C 0 values of Co/NC@void@C-x@MoS 2 remain almost constant in the frequency range of 9−12 GHz, indicating that Eddy current loss dominates the magnetic loss in this range. However, it is evident that there are fluctuations in the curves low (2−9 GHz) and high frequencies (12)(13)(14)(15)(16)(17)(18), which can attributed to the natural and exchange resonances. Accordingly, it can be concluded that the magnetic loss in the four absorbers is primarily composed of Eddy current loss and natural and exchange resonances.…”

“…In recent years, a variety of metal–organic framework (MOF)-derived materials have been designed as excellent EAMs because they possess the advantages of large specific surface, adjustable electronic structure, and satisfactory conductivity. For example, jujube pit-shape Co/C and Prussian blue analogue derived Fe/C. , The most significant feature of MOF-derived absorbers is that under controlled pyrolysis conditions, dispersed magnetic metal nanoparticles will be presented inside the carbon matrix, resulting in EAMs with synergistic loss properties promoting performance improvement. Simultaneously, metal doping in the carbon matrix was commonly achieved when the MOF was treated at high temperatures, which is beneficial to increase both the conductivity loss and polarization loss. − Nevertheless, MOF-derived absorbers have inferior impedance matching owing to the high conductivity of the magnetic metal nanoparticles and the carbon matrix.…”

“…For example, jujube pit-shape Co/C and Prussian blue analogue derived Fe/C. 14,15 The most significant feature of MOF-derived absorbers is that under controlled pyrolysis conditions, dispersed magnetic metal nanoparticles will be presented inside the carbon matrix, resulting in EAMs with synergistic loss properties promoting performance improvement. Simultaneously, metal doping in the carbon matrix was commonly achieved when the MOF was treated at high temperatures, which is beneficial to increase both the conductivity loss and polarization loss.…”

Bimetallic porphyrin MOF derived CuIn particles/carbon composites as ideal microwave absorbers

“…10,11 In general, due to favorable porosity and semiconductor properties, pristine MOFs are commonly applied in the fields of adsorption, gas separation and photocatalysis. 12,13 In recent years, the preparation of metal/carbon nanocomposites using metal–organic framework (MOF) materials as starting templates has received widespread attention on account of their highly tunable microstructures and elemental compositions, 14,15 mainly regarding energy storage, 16 electrocatalysis 17 and batteries. 18 Importantly, these customizable MOF-based derivatives also demonstrated prominent advantages in the high-performance microwave absorption materials field.…”