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Polymers 2018, 10(11), 1286;

Direct Growth of a Polypyrrole Aerogel on Hollow CuS Hierarchical Microspheres Yields Particles with Excellent Electromagnetic Wave Properties

Key Laboratory of Science and Technology on Electromagnetic Environmental Effects and Electro-Optical Engineering, The Army Engineering University, Nanjing 210007, China
Research Institute for National Defense Engineering of Academy of Military Science PLA China, Beijing 100036, China
Authors to whom correspondence should be addressed.
Received: 25 October 2018 / Revised: 15 November 2018 / Accepted: 16 November 2018 / Published: 19 November 2018
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A current hot topic in polymer science is the development of electromagnetic wave-absorbing materials with desired properties (i.e., proper impedance matching and strong attenuation capability), but it presents a considerable challenge. In this work, solvothermal, and self-assembled polymerization were employed for the controlled fabrication of a uniform polypyrrole (PPy) aerogel coated on hollow CuS hierarchical microspheres ([email protected]). The PPy coating thickness of the heterostructure could be tuned by varying the feeding weight ratios of CuS/pyrrole monomer. The electromagnetic wave absorption properties of the [email protected] composites were estimated to be in the frequency range 2–18 GHz. The as-prepared Sample B (fabricated by the addition of 35 mg CuS) showed a maximum reflection loss (RL) of −52.85 dB at a thickness of 2.5 mm. Moreover, an ultra-wide effective bandwidth (RL ≤ −10 dB) from 9.78 to 17.80 GHz (8.02 GHz) was achieved. Analysis of the electromagnetic properties demonstrated that the [email protected] had a remarkable enhancement compared to pure CuS platelet-based spheres and pure PPy, which can be attributed to the increased relatively complex permittivity and the promoted dielectric loss by the intense interfacial dielectric polarizations. We believe that the as-fabricated [email protected] can be a good reference for the fabrication of lightweight and optimal broadband absorbers. View Full-Text
Keywords: polypyrrole; core–shell; electromagnetic absorption; dielectric loss polypyrrole; core–shell; electromagnetic absorption; dielectric loss

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhang, Z.; Lv, X.; Cui, G.; Sui, M.; Sun, X.; Yu, S. Direct Growth of a Polypyrrole Aerogel on Hollow CuS Hierarchical Microspheres Yields Particles with Excellent Electromagnetic Wave Properties. Polymers 2018, 10, 1286.

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