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Tailor-made core/shell/shell-like Fe3O4@SiO2@PPy composites with prominent microwave absorption performance.

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Title: Tailor-made core/shell/shell-like Fe3O4@SiO2@PPy composites with prominent microwave absorption performance.
Authors: Liu, Tiansheng1, Liu, Na1, Zhai, Shangru1 zhaisrchem@163.com, Gao, Shengshuai1, Xiao, Zuoyi1, An, Qingda1 anqingdachem@163.com, Yang, Dongjiang1,2 d.yang@qdu.edu.cn
Source: Journal of Alloys & Compounds. Mar2019, Vol. 779, p831-843. 13p.
Subjects: Iron oxides, Metallic composites, Electromagnetic waves, Microemulsions, Functional groups
Abstract: Abstract Well-ordered core/shell/shell-like Fe 3 O 4 @SiO 2 @PPy microspheres with prominent electromagnetic microwave absorption performance were successfully obtained by microemulsion polymerization method. The morphology, crystal form, functional group, magnetism and microwave absorption properties were investigated. The tailored shell thickness can be tuned from 20 to 60 nm (including SiO 2 layer) via changing the molar ratio of Fe 3 O 4 @SiO 2 to Pyrrole. The absorption peak positions gradually move to low frequency with increment of coating thicknesses. The minimum RL reached −40.9 dB at 6 GHz with the coating thickness of 5 mm. The effective absorption bandwidth could reach 6.88 GHz from 11.12 to 18 GHz, completely covering the whole K (12–18 GHz) band. Meanwhile, it showed excellent wave absorption in 4.4–18 GHz with different coating thickness. The perfect electromagnetic wave absorption properties could be attributed to the dielectric loss from the special core/shell/shell microstructure and natural resonance from the Fe 3 O 4 microspheres. These newly prepared Fe 3 O 4 @SiO 2 @PPy microspheres might be considered as prospective nominees for highly efficient microwave absorption materials with tailored nanostructures. Graphical abstract Image 1 Highlights • Fe 3 O 4 @SiO 2 @PPy composites were fabricated by microemulsion polymerization method. • Fe 3 O 4 @SiO 2 @PPy composites were obtained via a three-step approach. • Plausible mechanisms governing the EM characteristic of composite were discussed. • Minimum RL was −40.9 dB at 6 GHz with a thickness of 5 mm. • The effective absorption bandwidth could reach 6.88 GHz from 11.12 to 18 GHz. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Abstract Well-ordered core/shell/shell-like Fe 3 O 4 @SiO 2 @PPy microspheres with prominent electromagnetic microwave absorption performance were successfully obtained by microemulsion polymerization method. The morphology, crystal form, functional group, magnetism and microwave absorption properties were investigated. The tailored shell thickness can be tuned from 20 to 60 nm (including SiO 2 layer) via changing the molar ratio of Fe 3 O 4 @SiO 2 to Pyrrole. The absorption peak positions gradually move to low frequency with increment of coating thicknesses. The minimum RL reached −40.9 dB at 6 GHz with the coating thickness of 5 mm. The effective absorption bandwidth could reach 6.88 GHz from 11.12 to 18 GHz, completely covering the whole K (12–18 GHz) band. Meanwhile, it showed excellent wave absorption in 4.4–18 GHz with different coating thickness. The perfect electromagnetic wave absorption properties could be attributed to the dielectric loss from the special core/shell/shell microstructure and natural resonance from the Fe 3 O 4 microspheres. These newly prepared Fe 3 O 4 @SiO 2 @PPy microspheres might be considered as prospective nominees for highly efficient microwave absorption materials with tailored nanostructures. Graphical abstract Image 1 Highlights • Fe 3 O 4 @SiO 2 @PPy composites were fabricated by microemulsion polymerization method. • Fe 3 O 4 @SiO 2 @PPy composites were obtained via a three-step approach. • Plausible mechanisms governing the EM characteristic of composite were discussed. • Minimum RL was −40.9 dB at 6 GHz with a thickness of 5 mm. • The effective absorption bandwidth could reach 6.88 GHz from 11.12 to 18 GHz. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2018.11.167