Excellent microwave absorption properties of Fe ion-doped SnO₂/multi-walled carbon nanotube composites

Abstract

Fe ions doped SnO2/MWCNTs composites with 48.8% Fe ions doping content showed the maximum reflection loss was −44.54 dB at 15.44 GHz, and the maximum absorption bandwidth of reflection loss below −10 dB was 4.5 GHz in the Ku band.

Flaky FeSiAl alloy-carbon nanotube composite with tunable electromagnetic properties for microwave absorption

“…It is known that good impedance matching which requires the balance between permittivity and permeability is the prerequisite for EM wave entering absorber. The impedance matching degree ∆ of the FeSiAl-8 and FeSiAl/MWCNTs can be calculated in the following equations 45 46 :…”

Nickel foam and stainless steel mesh as electrocatalysts for hydrogen evolution reaction, oxygen evolution reaction and overall water splitting in alkaline media

“…48 While the peaks at 712.1 and 724.8 eV are assigned to the Fe 2p 3/2 and Fe 2p 1/2 of Fe 2 O 3 . 48,49 The other elements, such as Cr, Si and Mn were not displayed obviously in the survey spectrum, but clearly observed in the high resolution XPS spectra (Fig. S2 †).…”

Solvothermal synthesis of three-dimensional, Fe2O3NPs-embedded CNT/N-doped graphene composites with excellent microwave absorption performance

“…These residual groups and defects act as polarized centers that can introduce defect polarization relaxation and relaxation processes, which all support microwave absorption. 60 Therefore, it is proposed that a novel absorption mechanism can be illustrated based on the layered structure; that is, the hierarchical structure provides a container which attenuates electromagnetic energy by extension through the travel path while gradually reducing energy.…”