Construction of one-dimensional MoO₂/NC heteronanowires for microwave absorption

Abstract

A combination of a special micro–nanostructure and multiple components has been proven as an effective strategy to strengthen the microwave attenuation capacity.

A bead–string Co/C@BNNT nanocomposite: preparation and tunable electromagnetic wave absorption performance

“…Commercially, excellent microwave absorption materials normally require an RL value below −10 dB at a thin thickness over a wide frequency band. 36 The transmission line theory 37,38 describes the RL value as follows:…”

“…Commercially, excellent microwave absorption materials normally require an RL value below −10 dB at a thin thickness over a wide frequency band. 36 The transmission line theory 37,38 describes the RL value as follows:where Z in is the input characteristic impedance, Z 0 (≈377 Ω) represents the impedance of free space, ε r is the complex permittivity and can be expressed as ε r = ε ′ − jε ′′, f stands for the tested frequency, μ r is the complex permeability and can be expressed as μ r = μ ′ − jμ′′ , d stands for the sample thickness, and c represents the light speed in a vacuum.…”

Microwave absorbing characteristics of porphyrin derivates: a loop of conjugated structure

“…The more closed Z to 1 declares the more impedance matching leading to more microwave attenuation (Eqn S4 †). [101][102][103] Hence, the emerged metamaterial feature can promote impedance matching. A constructive trade-off between Z and attenuation constant (a) strengthens microwave mitigation.…”

Porous Molybdenum Compound Design for Strong Microwave Absorption

“…30 Zhang et al prepared MoO 2 /NC heteronanowires, and the minimum reflection loss reached −35.0 dB at 9.37 GHz at 2.3 mm. 31 However, the poor impedance matching by excessive electric conductivity is still an issue hindering the application of MoO 2 . 32 In this case, exploring a modification of MoO 2 to improve impedance matching for highly efficient MA performance is of great significance.…”

“…Recently, Bai et al prepared C and N codoped MoO 2 fibers in which the minimum reflection loss reached −40.1 dB at 3.5 mm . Zhang et al prepared MoO 2 /NC heteronanowires, and the minimum reflection loss reached −35.0 dB at 9.37 GHz at 2.3 mm . However, the poor impedance matching by excessive electric conductivity is still an issue hindering the application of MoO 2 .…”