Heterogeneous junctions of magnetic Ni core@binary dielectric shells toward high-efficiency microwave attenuation

doi:10.1016/j.jmst.2021.10.035

Abstract

Abstract:

Metal-organic-frameworks (MOFs) derived carbon-based composites with balanced impedance matching and synergistic dielectric/magnetic loss are considered as promising microwave absorbers. With the aim to promote interfacial polarization, herein, heterogeneous junctions composed of magnetic Ni core and binary dielectric shells (C and PEDOT) are synthesized by annealing Ni-MOFs precursors and an in-situ polymerization strategy, forming Ni@C@PEDOT spheres with multilayer heterogeneous interfaces. The results indicate that the final absorption attenuation is sensitive to the thickness of the dielectric PEDOT layer, when the thickness of the PEDOT layer is 224 nm, an optimal reflection loss of -72.4 dB is achieved at 2 mm and the effective absorption bandwidth reaches 6.4 GHz with a thickness of only 1.85 mm, the excellent absorption attenuation is accredited to the promoted impedance matching, enhanced conduction loss as well as the synergistic interfacial polarization induced by magnetic core and binary dielectric shells. Meanwhile, this work offers a simple and significant strategy in preparation for ideal microwave absorbers by rational design of multilayer heterogeneous interfaces.

Key words: Metal-organic-frameworks, Core-shell structure, Conductive polymer, Microwave absorption

Jijun Wang, Songlin Yu, Qingqing Wu, Yan Li, Fangyuan Li, Xiao Zhou, Yuhua Chen, Bingzhen Li, Panbo Liu. Heterogeneous junctions of magnetic Ni core@binary dielectric shells toward high-efficiency microwave attenuation[J]. J. Mater. Sci. Technol., 2022, 115: 71-80.

Figures/Tables 9

Scheme 1. Synthetic illustration of the Ni@C@PEDOT spheres.

Fig. 1. SEM and TEM images of Ni@C@PEDOT-10 (a, e), Ni@C@PEDOT-20 (b, f), Ni@C@PEDOT-30 (c, g), Ni@C@PEDOT-50 (d, h), TEM image (i), HAADF image (j), the corresponding element mappings (k-o) and EDS pattern (p) of Ni@C@PEDOT-30.

Fig. 2. XRD patterns (a), Raman spectra (b), XPS spectra (c) of Ni@C@PEDOT-10, Ni@C@PEDOT-20, Ni@C@PEDOT-30 and Ni@C@PEDOT-50; C 1 s spectrum (d), Ni 2p spectrum (e) and S 2p spectrum (f) of Ni@C@PEDOT-30.

Fig. 3. The RL value, 3D RL and 2D projection plots of Ni@C@PEDOT-10 (a-c), Ni@C@PEDOT-20 (d-f), Ni@C@PEDOT-30 (g-i) and Ni@C@PEDOT-50 (j-l).

Fig. 4. The ε′ (a), ε″ (b), tanδε (c), μ′ (d), μ′′ (e) and tanδμ (f) values of Ni@C@PEDOT-10, Ni@C@PEDOT-20, Ni@C@PEDOT-30 and Ni@C@PEDOT-50.

Fig. 5. Cole-Cole plot of Ni@C@PEDOT-10 (a), Ni@C@PEDOT-20 (b), Ni@C@PEDOT-30 (c) and Ni@C@PEDOT-50 (d).

Fig. 6. The C0 values (a) and α values (b) of Ni@C@PEDOT-10, Ni@C@PEDOT-20, Ni@C@PEDOT-30 and Ni@C@PEDOT-50.

Fig. 7. RL values, matching thicknesses and impedance matching of Ni@C@PEDOT-10 (a), Ni@C@PEDOT-20 (b), Ni@C@PEDOT-30 (c) and Ni@C@PEDOT-50 (d).

Fig. 8. Possible microwave absorbing mechanism of Ni@C@PEDOT.

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