Microporous polythiophene (MPT)-guest complex derived magnetic metal sulfides/carbon nanocomposites for broadband electromagnetic wave absorption

doi:10.1016/j.jmst.2021.05.046

Abstract

Abstract:

Electrical and magnetic properties are two crucial factors for the designing of broadband electromagnetic wave absorption (EWA) materials. In this work, we synthesized various magnetic metal sulfides/carbon (M_xS_y/C) nanocomposites from the precursor complex of metal in microporous polythiophene (MPT), and systematically investigated their EWA properties and mechanism. The characterization results indicate that M_xS_y were determined to be Fe₇S₈/C, Co₉S₈/C and Ni₄S₃/C, respectively. It is observed that M_xS_y/C nanocomposites exhibit remarkable EWA performances, where the maximal absorption gets to -51.3 dB, and efficient absorption can be realized in 10.32-18 GHz (7.68 GHz), which is superior to most reported magnetic carbonaceous EWA composites. Beside, the efficient absorption can be tuned to cover Ku band X band, demonstrating their great potential in practical applications. Improved conductance loss, obvious polarization relaxation, and apparent eddy current loss are deemed to make the predominant contributions to the high-performance EWA. This research opens up the exploration of novel nanocomposite coupling dielectric loss and magnetic loss using MPT-metal complex precursor for EWA applications.

Key words: Microporous polythiophene, Metal sulfide, Carbon composite, Conjugated microporous polymer, Electromagnetic wave absorption

Yingzhi Jiao, Siyao Cheng, Fan Wu, Jiaoyan Shi, Aming Xie, Xufei Zhu, Wei Dong. Microporous polythiophene (MPT)-guest complex derived magnetic metal sulfides/carbon nanocomposites for broadband electromagnetic wave absorption[J]. J. Mater. Sci. Technol., 2022, 100: 206-215.

Figures/Tables 8

Fig. 1. (a) The synthetic process, (b) TG curves, (c) XRD patterns, and (d) Raman spectra of MxSy/C nanocomposites; SEM images of (e) C-MPT, (f) FexSy/C, (g) CoxSy/C, and (h) FexSy/C.

Fig. 2. Characterization of FexSy/C: (a) TEM image, (b) electron diffraction pattern, and (c, d) magnified TEM images; Elemental mapping analysis of (e) C, (f) S, (g) Fe, and (h) overlay; XPS spectra of (i) S 2p, and (j) Fe 2p.

Fig. 3. Characterization of CoxSy/C: (a) TEM image, (b) magnified TEM image, and (c) electron diffraction pattern; Elemental mapping analysis of (d) C, (e) S, (f) Co, and (g) overlay; XPS spectra of (h) S 2p, and (i) Co 2p.

Fig. 4. Characterization of NixSy/C: (a, b) TEM images, (c, d) magnified TEM images, and (e) electron diffraction pattern; Elemental mapping analysis of (f) C, (g) S, (h) Co, and (i) overlay; XPS spectra of (j) C 1s, (k) S 2p, and (l) Ni 2p.

Fig. 5. RL curves of (a, b) C-MPT, (c, d) FexSy/C, (e, f) CoxSy/C, (g, h) NixSy/C, (i, j) CoxSy/C-L, and (k, l) C-E with the loading ratio of 20 wt% in wax.

Fig. 6. Optimized EWA performances of (a-c) FexSy/C, (d-f) CoxSy/C, and (g-i) NixSy/C with the loading ratio of 20 wt% in wax.

Fig. 7. (a) |Z| curves, (b) α curves, (c) dielectric loss curves, and (d) EC values of MxSy/C nanocomposites and comparison samples; (e, f) Cole-cole plots of CoxSy/C; (g) Magnetic loss curves of MxSy/C nanocomposites and comparison samples; (h) Hysteresis loops, and (i) C0-f curves of MxSy/C nanocomposites.

Fig. 8. (a) The EWA process, (b, c) conductance loss and polarization loss, and (d) eddy current loss of MxSy/C nanocomposites.

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