Flexible and biocompatible poly (vinyl alcohol)/multi-walled carbon nanotubes hydrogels with epsilon-near-zero properties

Heterojunction MoS2@VO2 Microspheres for Electromagnetic Wave Absorption in the X-Band

“…Among them, the characteristic peaks of V 2p were deconvoluted to obtain three subpeaks located at 530.0, 523.9, and 517.0 eV, which were assigned to V 4+ in VO 2 , V 2p 3/2 and V 2p 1/2 , , which indicated that VO 2 was better prepared and chemically stable. For the splitting results of O 1s, the split peaks located at 530.1, 513.4, and 532.5 eV correspond to metallic oxygen, defective oxygen, and adsorbed oxygen, respectively . This is the result of the combined effect of metal–oxygen bonding and chemical reactions during the synthesis of the material.…”

Self-Stacked Growth of Cu9S5 Nanostructures with Morphology Regulation as an Electromagnetic Wave Absorber

“…For a more comprehensive explanation of the material interferencecancelation principle of microwaves, a quarter-wavelength (λ/ 4) model can be introduced, when the absorber matching thickness (t m ) and peak (f m ) to meet the eq 5 will produce interference phenomena, so as to attenuate the microwave as much as possible. 50,51 The explanation of the mechanism of double absorption peaks mainly focuses on the λ/4 principle, when the phase difference between the reflected wave and the incident wave satisfies the λ/4 condition, the interference phenomenon will occur and then produce the double absorption peak phenomenon. The best performance was achieved in Figure 8c when the CS-3 matching thickness was 1.78 mm and the CS-3 satisfied several characteristics (RL min = −60.77 dB, EAB = 4.08 GHz).…”

“…As shown in Figure a–c), the | Z in / Z 0 | values (the calculation is shown in eq ) of all three groups of samples were basically around 1 when they had good absorption properties. , A single Cu 9 S 5 material had a high attenuation constant, but all had a serious impedance mismatch, preventing the external microwaves from entering the material well. For a more comprehensive explanation of the material interference-cancelation principle of microwaves, a quarter-wavelength (λ/4) model can be introduced, when the absorber matching thickness ( t m ) and peak ( f m ) to meet the eq will produce interference phenomena, so as to attenuate the microwave as much as possible. , The explanation of the mechanism of double absorption peaks mainly focuses on the λ/4 principle, when the phase difference between the reflected wave and the incident wave satisfies the λ/4 condition, the interference phenomenon will occur and then produce the double absorption peak phenomenon. The best performance was achieved in Figure c when the CS-3 matching thickness was 1.78 mm and the CS-3 satisfied several characteristics (RL min = −60.77 dB, EAB = 4.08 GHz). T m = n λ 4 = n c 4 f m false( | ε normalr | | μ normalr | false) 1 / 2 goodbreak0em2em⁣ ( n = 1,3,5 · · · · · · ) where μ r and ε r are the complex permittivity and permeability, respectively.…”