Abstract
To reduce electromagnetic pollution as well as increase the accuracy of high-precision electronic equipment, more attention has been paid to new electromagnetic wave (EMW) absorbing materials, which have the advantages of strong absorption, wide absorption bands, and a narrow thickness. In this study, a novel ternary type of the NiS2@rGO/polypyrrole (PPy) sandwich-like structured composites was synthesized via a facile two-step method, in which the hydrothermal method was used to prepare NiS2@rGO binary composites and then the in situ polymerization method was used to synthesize the PPy, which acted as the outer layer of the sandwich-like structure. The morphologies and electromagnetic absorption performance of the NiS2@rGO/PPy were measured and investigated. A sample with 6 wt% NiS2@rGO/PPy loading paraffin-composite obtained an outstanding reflection loss (RL) of −58.7 dB at 16.44 GHz under a thickness of 2.03 mm. Simultaneously, the effective electromagnetic wave absorption bandwidth for RL < −10 dB, which covered 7.04 to 18.00 GHz (10.96 GHz), was achieved by changing the thickness of the absorber from 2.0 to 3.5 mm. The results not only suggest that the NiS2@rGO/PPy composite has excellent performance in the field of EMW absorption but also prove that the novel sandwich-like structure can contribute to appropriate impedance matching through multiple relaxation and interfacial polarization processes.
Highlights
In recent years, with the development of advanced high-power electronic equipment, electromagnetic (EM) pollution, which has harmful effects on human life, has become significant [1,2,3]
The practical application of single-component absorbers, such as Fe3O4, Co, and polypyrrole (PPy), is restricted because they do not have the characteristics of small matching thickness, light weight, strong absorption features, and a wide EM absorption band
In contrast with single absorbers, multiple-component absorbers can better meet the requirements of being a highly efficient electromagnetic wave (EMW) absorber on account of their adjustable impedance matching and multilayer structures [5,6]
Summary
With the development of advanced high-power electronic equipment, electromagnetic (EM) pollution, which has harmful effects on human life, has become significant [1,2,3]. Extensive studies have proved that polypyrrole can be used as an effective material in the EMW absorption field [25,26] This is due to the synergistic effects of the conjugated bonds and electric dipoles in the composites containing PPy under external EMW, which could improve the dielectric loss and impedance matching. Their work proved that adding an additional interfacial polarization step can play a role in improving impedance matching if the carbon-based nanomaterials are coated with PPy. Inspired by this, the rGO-based binary composite coated with PPy has great potential to obtain new types of EMW absorber with a wide absorbing frequency, light weight, and strong absorption. We fabricated a novel ternary type of the NiS2@rGO/polypyrrole (NiS2@rGO/PPy) sandwich-like structure composite with a remarkable EMW absorption property. The detailed EM absorption performance study on the NiS2@rGO/PPy sandwich-like structure composite showed an excellent intensity and bandwidth for EM absorption as well as good compatibility and excellent stability during production and testing
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