Microwave absorption properties of SiC@SiO2@Fe3O4 hybrids in the 2–18 GHz range

Abstract

Abstract:To enhance the microwave absorption performance of silicon carbide nanowires (SiCNWs), SiO 2 nanoshells with a thickness of approximately 2 nm and Fe 3 O 4 nanoparticles were grown on the surface of SiCNWs to form SiC@SiO 2 @Fe 3 O 4 hybrids. The microwave absorption performance of the SiC@SiO 2 @Fe 3 O 4 hybrids with different thicknesses was investigated in the frequency range from 2 to 18 GHz using a free-space antenna-based system. The results indicate that SiC@SiO 2 @Fe 3 O 4 hybrids exhibit improved microwave absorption. In particular, in the case of an SiC@SiO 2 to iron(III) acetylacetonate mass ratio of 1:3, the microwave absorption with an absorber of 2-mm thickness exhibited a minimum reflection loss of −39.58 dB at 12.24 GHz. With respect to the enhanced microwave absorption mechanism, the Fe 3 O 4 nanoparticles coated on SiC@SiO 2 nanowires are proposed to balance the permeability and permittivity of the materials, contributing to the microwave attenuation.

Review of electromagnetic interference shielding materials fabricated by iron ingredients

“…In this case, the mixing of a magnetic material with a binary dielectric material not only enhances its attenuation ability, but also conserves the degree of impedance matching. In this direction, several composites such as Ag@Fe 3 O 4 /RGO, 154 SiC@SiO 2 @Fe 3 O 4 , 180 hollow carbon@Fe@Fe 3 O 4 nanospheres 165 and many others have been studied so for. Ternary composites can be made either by a core@shell@shell structure, by a combination of three materials or by dispersion of the core@shell structure into a matrix like graphene, PPy or PVDF etc.…”

Synthesis and characterization of Ba0.6Ca0.4Fe12O19/Fe3O4/SiO2 nanocomposite

“…where the impedance of free space Zo, input impedance Zin, frequency of microwave f, velocity of microwaves c, and thickness d. Figure 3 shows two-dimensional (2D) representation RL verses various thicknesses of samples [8,10,15]. Reflection loss (RL) of barium hexaferrite Ba0.6Ca0.4Fe12O19 (0%) showed more than 90% microwave absorption at the frequency range of 8.20-10.19 GHz with a 4 mm thick absorber (Figure 3a).…”

“…In recent years, literature review on the use of barium hexaferrite as microwave absorber was resulted in many published research [8][9]. The study of Neodymium ions activated barium ferrite in composites form (NdBFCs) with composition (20)BaO:(80-x)γ-Fe2O3:(x)Nd2O3 ( x = 0, 1 and 2 mol%) has exhibited a better absorption on microwave X-band absorber applications [10].…”

Development of Ba0.6Ca0.4Fe12O19/Fe3O4/Sio2 Composite Material For Microwave Absorption Applications At X-Band Frequency Range

“…The development of communication techniques with the operation frequency in GHz range such as local internet, mobile communication, and radar systems causes serious electromagnetic (EM) interference pollution [1][2][3][4]. It is highly importunate to eliminate EM interference problems.…”