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GO@Fe3O4@CuSilicate Composite with a Hierarchical Structure: Fabrication, Microstructure, and Highly Electromagnetic
Ping Fan1, Jiahao Tang1, Shunxin Jia1
1College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
ACS Omega
|April 21, 2020
Summary
Hierarchically structured nanocomposites, GO@Fe3O4@CuSilicate, exhibit superior electromagnetic shielding. The GO@Fe3O4@CuSilicate material offers over 40 dB shielding in the X-band, primarily through absorption.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- Electromagnetic interference (EMI) shielding materials are crucial for protecting sensitive electronics.
- Developing high-performance, lightweight, and cost-effective EMI shielding materials remains a significant challenge.
- Hierarchical nanostructures offer unique properties for advanced material applications.
Purpose of the Study:
- To fabricate and characterize two novel hierarchical nanocomposites: GO@CuSilicate@Fe3O4 and GO@Fe3O4@CuSilicate.
- To evaluate and compare the electromagnetic shielding efficiency of these nanocomposites in the X-band frequency range (8-12 GHz).
- To elucidate the structure-property relationships governing the electromagnetic shielding performance.
Main Methods:
- Synthesis of hierarchical nanocomposites with core-shell structures.
- Structural, compositional, and morphological analysis using X-ray diffraction, SEM, Raman spectroscopy, and BET methods.
- Measurement of electromagnetic shielding efficiency across the 8-12 GHz frequency range.
Main Results:
- Both synthesized nanocomposites exhibited a core-shell structure with CuSilicate nanoneedle arrays forming the shell.
- GO@Fe3O4@CuSilicate demonstrated significantly higher electromagnetic shielding efficiency compared to GO@CuSilicate@Fe3O4.
- A 1 mm thick GO@Fe3O4@CuSilicate sample achieved over 40 dB shielding in the entire X-band (8.2-12.4 GHz), peaking at 41.8 dB at 8.2 GHz, with absorption being the dominant shielding mechanism.
Conclusions:
- The hierarchical structure, particularly the "antenna" effect of CuSilicate nanoneedles and interfacial polarization, enhances EMI shielding.
- GO@Fe3O4@CuSilicate is a promising high-performance electromagnetic shielding material for GHz frequency applications.
- This study offers valuable insights into designing advanced EMI shielding materials through structural engineering.
