研究目的
Investigating the synthesis and electromagnetic properties of Si-based KH560/RGO@Fe3O4 composites for improving electromagnetic wave absorption in the 2–18 GHz frequency range.
研究成果
The Si-based KH560/RGO@Fe3O4 composite exhibits excellent electromagnetic wave absorption performance, with a maximum reflection loss of ?25 dB at 14.1 GHz and a broad absorption bandwidth. The dielectric loss is attributed to multiple Debye dipolar relaxation, and the magnetic loss is due to the eddy-current effect of Fe3O4 NPs. This composite is a promising candidate for lightweight and wide bandwidth electromagnetic absorption materials.
研究不足
The study focuses on the 2–18 GHz frequency range and the specific composite ratios tested. Further optimization of the composite ratios and exploration of other frequency ranges could enhance the findings.
1：Experimental Design and Method Selection:
A facile hydrothermal method was employed to synthesize KH560/RGO@Fe3O4 composites with different ratios of Fe3O4 NPs.
2：Sample Selection and Data Sources:
Commercial graphene oxide (GO) was used as the starting material, with FeCl3·6H2O as the source of Fe3O4 NPs.
3：List of Experimental Equipment and Materials:
Equipment included a Bruker D8 advanced diffractometer, JEOL JSM-7800FE SEM, Hitachi HT-7700 TEM, Nicolet iS10 FT-IR spectrometer, Reinishaw inVia Raman microscope, Thermo Fisher Scientific ESCALAB Xi+ XPS spectrometer, and Agilent Technologies N5227A microwave vector network analyzer. Materials included GO, sodium acetate, ethylene glycol, PEG-200, FeCl3·6H2O, and KH
4：Experimental Procedures and Operational Workflow:
5 GO was modified with KH560, then Fe3O4 NPs were loaded onto KH560/RGO via hydrothermal synthesis. The composites were characterized by XRD, SEM, TEM, FT-IR, Raman, XPS, and their electromagnetic properties were measured.
5：Data Analysis Methods:
The electromagnetic properties were analyzed based on the measured permittivity and permeability, and the reflection loss was calculated using transmit-line theory.
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