Hierarchical Fe3O4@carbon@MnO2 hybrid for electromagnetic wave absorber

Carbon-Coated Mn4N Nanowires with Abundant Internal Voids for Microwave Absorption

“…From 700 to 800 °C, the mass loss of about 1% might be caused by further oxidation of the carbon residue . At the end, the carbon coating disappeared, and the Mn 4 N eventually was oxidized to Mn 2 O 3 . ,, By calculation, the carbon content of the Mn 4 N@C NW composite was about 47.98 wt %. In addition, the graphitization degree of carbon can greatly affect the EM parameters and microwave absorption performances of materials, which can be accurately exposed by the Raman spectrum. , It could be found that Mn 4 N@C NWs displayed two distinguishable peaks at 1341 and 1586 cm –1 , assigned to D and G bands, respectively.…”

The development of a magnetic iron/nitrogen-doped graphitized carbon composite with boosted microwave attenuation ability as the wideband microwave absorber

“…To the best of our knowledge, the graphitized level is highly associated with the permittivity value, which indirectly inuenced the microwave absorption intensity. 49 In order to investigate the microwave absorption ability, the reection loss value was calculated according to the transmission-line rule: [50][51][52][53]…”

Surface Architecture of Ni-Based Metal Organic Framework Hollow Spheres for Adjustable Microwave Absorption

“…Generally, the permittivity of a material results from various kinds of polarizations, including electron, ion, dipole, and interfacial polarization . However, the polarization of electrons and ions can be neglected because they occur in the ultraviolet and infrared bands. , Therefore, interface and dipole polarization should be the main types of polarizations in this case. With different surface structures, the method of polarization may vary, associated with various ε′ and ε″ behaviors.…”