A novel rod-like MnO₂@Fe loading on graphene giving excellent electromagnetic absorption properties

Abstract

The rod-like structure of MnO2@Fe is apt to convert the electromagnetic wave to microcurrent and then attenuate it.

Heteronanostructured Co@carbon nanotubes-graphene ternary hybrids: synthesis, electromagnetic and excellent microwave absorption properties

“…6a and b, the M s values of G400 and G450 are 23.9 and 21.2 emu/g, respectively. Compared to those of magnetic graphene-based hybrids reported before495051, the as-synthesized Co@CNTs-G ternary hybrids display an enhanced magnetic property due to high content of magnetic nanoparticle. Based on the Co content in the obtained hybrids and the M s value of Co at 300 K, the theoretical M s values of G400, G450, G500 and G550 should be 26.1, 14.2, 10.4 and 4.1 emu/g, respectively.…”

“…Actually, the α value of as-prepared hybrid increases slightly with the rise of CNT content in the hybrid, and the α value of G550 exhibits an evident fall when the CNT content in the obtained hybrid is high enough. In addition, compared to the previously reported MnO 2 @Fe-G, Fe/MWCNTs, Co/MWCNTs and Ni/MWCNTs5160, the α values of the obtained ternary nanohybrids are much higher, and the high value of α is conducive to improve EM wave absorption capability6. Based on the measured complex permittivity and permeability, the impedance matching ratios of the as-prepared ternary hybrids are obtained and the results are displayed in Fig.…”

Development of a hollow carbon sphere absorber displaying the multiple-reflection effect to attenuate electromagnetic waves

“…6a). [47][48][49] While for the nonmagnetic material (m r ¼ 1), a larger 3 r value damages the impedance matching value, as seen in Fig. 6b.…”

Dependency of tunable microwave absorption performance on morphology-controlled hierarchical shells for core-shell Fe3O4@MnO2 composite microspheres

“…where c and f represent the velocity of light and frequency, respectively [36,42,47]. The Figure 10B shows …”

“…Based on the free electron theory, ߝ ᇱᇱ ≈ 1 ߨߝ ߩ݂ ⁄ , where ߩ is the resistivity, the high ߝ ᇱᇱ value means the low resistivity, which illuminates the good electronic transmission performance and excellent conductivity [14,43]. It can be inferred that the conductive loss exists and the high conductivity may stem from the generation of microcurrent in the special microstructure with the altering electromagnetic field [36,[44][45]. In addition, the interfaces between the In the analysis of microwave absorption mechanism, it is necessary to take into account the impedance matching and attenuation constant.…”