Effect of graphene oxide content on the microstructure and EMI shielding properties of polymer coatings
The current strong electromagnetic environment puts higher requirements on the electromagnetic shiel-ding and protection capability of electronic equipment and informatization weapons.Hence,a kind of polymer coat-ing material with both high electromagnetic shielding capability and lightweight properties was produced.The report fully characterized the microscopic morphology and components of the material based on X-ray diffraction and Fou-rier transform infrared(FTIR)spectroscopy.The prepared coating material has a thickness of 200 μm,a density of 1.37 g/cm3,an indentation modulus of 10.8 GPa,and a maximum electromagnetic shielding efficiency of 42.8 dB within the 300 MHz～18 GHz band.The effects of six different rGO(reduced graphene oxide)contents on the me-chanical properties and electromagnetic shielding effectiveness of the composite coated surface were investigated by applying nanoindentation and vector network analyzer.The results show that the shielding mode of polymer coatings is mainly by the absorption of electromagnetic waves,and adding rGO content improves the mechanical properties and electromagnetic shielding performance of the coating material.Compared with the coating without rGO,the in-dentation modulus of the coating with a 0.9%of rGO content increases by 68.75%,and the total shielding efficien-cy increases by 11.7%.
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