Controllable Preparation of MoS2/rGO Electromagnetic Shielding Materials and Study of Their Properties
As the problem of electromagnetic interference(EMI)pollution is becoming more and more prominent,there is an urgent need to investigate highly adaptable,efficient and high-performance EMI shielding materials.We have successfully prepared molybdenum disulfide and reduced graphene oxide(MoS2/rGO)composites by means of hydrothermal and thermal treatments.rGO sheets and MoS2 nanosheets generated in situ on their surface construct a three-dimensional(3D)porous network framework,effectively preventing the accumulation of both materials.At the same time,the combination of MoS2 nanosheets and rGO sheets can form a stable 3D conductive network,which can effectively enhance the electronic conductivity and carrier migration rate,thus further reducing the conduction loss of the system.In addition,the excellent EMI shielding performance of the composites can be attributed to the multiple reflections and scattering of electromagnetic waves inside the materials,and the defective sites of MoS2 nanosheets and rGO sheets and their rich interfaces induced dipole polarization and interfacial polarization phenomena,endowing the system with excellent EMI shielding performance.In the X-band range(8.2-12.4 GHz),the total shielding effectiveness(SET)of the MoS2/rGO composites reaches up to 62.7 dB(average SET of 59.9 dB)at a thickness of 2.0 mm due to the synergistic effect of multiple loss mechanisms.Thus,the MoS2/rGO composites have excellent EMI shielding performance,which provides theoretical support for the application of other transition metal sulfides in the field of EMI shielding.
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