1D Cu@Ni nanorods anchored on 2D reduced graphene oxide with interfacial engineering to enhance microwave absorption properties

Abstract

In this work, one-dimensional core–shell Cu@Ni nanorods which were anchored on two dimensional reduced graphene oxide (rGO) heterostructures were successfully prepared by a simple co-reduction method.

Enhancement of electromagnetic interference shielding from the synergism between Cu@Ni nanorods and carbon materials in flexible composite films

“…In our previous study, Ni-Cu alloy was found to have high impedance match, dielectric loss, multiple polarization relaxation and natural resonance in favor of attenuation of EMI waves [38]. It particularly exhibited a strong absorption loss by balancing the dielectric and magnetic losses when anchoring on reduced graphene oxide (rGO) [39]. Noticeably, high magnetic magnetization alloys may exhibit poor impedance matching ability due to their ultrahigh conductivity [36,40].…”

“…5(d), which increased from 70.9% to 80.1%, further identified the attenuation of the Cu@Ni-decorated composite films as being mainly driven by absorption loss. The absorption loss contributed by the Cu@Ni nanorods originated from the dielectric-magnetic (or core-shell) microstructure, impedance mismatch, intense interfacial polarization, eddy current loss and multiple reflections [39]. Firstly, the EMI waves were absorbed through the complementary effects between magnetic loss and dielectric loss.…”

Ferromagnetic and excellent microwave absorbing properties of CoNi microspheres and heterogeneous Co/Ni nanocrystallines

“…have been synthesized. [5][6][7] To obtain high dielectric loss and optimized impedance matching, multiple-phase structured MAM composites, such as Cu@Ni@RGO, 8 RGO/ BaFe 12 O 19 /Fe 3 O 4 , 9 RGO/CoFe 2 O 4 /ZnS, 10 PANI/a-Fe 2 O 3 @SiO 2 , 11 Co/CoO, 12 CoNi@C/RGO, 13 and Fe-Fe 3 O 4 @C, 14 have been widely investigated. However, to the best of our knowledge, heterogeneous ferromagnetic metal nanocrystalline MAMs have been seldom investigated.…”

“…9 Wang and coworkers 15 synthesized novel wire-on-ake heterostructured Co 0.5 Ni 0.5 P on a carbon cloth when the relative molar ratio of Co and Ni precursors was 1 : 1 using the hydrothermal reaction. Zhao et al 8 prepared core-shell Cu@Ni nanorods using the hydrothermal method. Yu et al 16 used the magnetic eld-assisted solvothermal method to fabricate the differently shaped assemblies of Ni-Co alloys with different microstructures by adjusting the experimental parameters of precursor concentrations and Ni/Co ratios.…”

Facile synthesis of highly conductive MoS2/graphene nanohybrids with hetero-structures as excellent microwave absorbers

“…[1][2][3][4][5][6] Two-dimensional (2D) materials, specially molybdenum disulde (MoS 2 ), have attracted attention as MA materials due to their size effect, high specic surface areas and remarkable mechanical properties. [7][8][9][10][11] However, the further application of pure MoS 2 is limited by narrow bandwidth; low RL value and the poor impedance matching of single component materials. [12][13][14][15] Therefore, one of the strategies is introducing a second phase, such as magnetic ferrite (Fe 3 O 4 ), 16,17 carbon materials (CNT, GN), 18,19 and conductive polymers (PEDOT), 20,21 into/onto the matrix to improve the MA performance and enrich impedance matching.…”