Rational manipulation of composition and construction toward Zn/Co bimetal hybrids for electromagnetic wave absorption

doi:10.1016/j.jmst.2022.07.004

Abstract

Abstract:

Rational manipulation of multi-metal hybrids with controllable compositions and constructions is evolving as an efficacious strategy for tunable electromagnetic (EM) characteristics and EM wave (EMW) absorption. Herein, a novel bi-orientation etching approach is proposed to regulate the chemical compositions and hybridization construction of Zn/Co hybrids, thence meeting the synergistic interaction among diverse compositions for ultra-high EMW absorption. Attributing to the stepwise heterometallic modification by Zn in Co-ZIFs (Zn@Co-ZIF) and Co in Zn-ZIFs (Co@Zn-ZIF), corresponding pyrolysis products with variable Zn/Co atomic concentration and hybridization states (Zn@Co-C, Co@Zn-C) can be obtained. The Co species was confirmed to have a positive impact on both the dielectric and magnetic response, while an appropriate amount of Zn hybridization in Co substance further enhanced the synergistic effect between multiple loss mechanisms, promoting the minimum reflection loss and effective absorption bandwidth of Zn@Co-C reached -34.99 dB and 5.52 GHz (2.00 mm), respectively. Finally, this work reveals the composition and construction dependency of bimetal hybrids on EMW absorption, which can be a strong reference for developing EMAs with diverse hybridization structures.

Key words: Hybridization, Composition, Construction, Electromagnetic wave absorption

Xiuyun Ren, Yihe Song, Zhenguo Gao, Yalan Wu, Zirui Jia, Guanglei Wu. Rational manipulation of composition and construction toward Zn/Co bimetal hybrids for electromagnetic wave absorption[J]. J. Mater. Sci. Technol., 2023, 134: 254-261.

Figures/Tables 4

Fig. 1. Schematic illustration of preparation of Zn/Co hybrid with tunable compositions and constructions.

Fig. 2. (a) XRD patterns, (b) Raman spectra of all Zn@Co-C. (c) XPS Zn 2p spectra of Zn@Co-C obtained with etching time of 4 h and 16 h. (d) XPS Co 2p spectra of Zn@Co-C obtained with etching time of 0 h, 4 h and 16 h. (e) SEM images of all Zn@Co-C. (f) Schematic illustration of Zn2+ etching Co-ZIF mechanism and (g) corresponding pyrolysis products obtained with increasing etching time. EDX spectra of (h) Zn@Co-C-0 h and (i) Zn@Co-C-16 h. HRTEM, grain size distribution and SAED images of (j) Zn@Co-C-0 h and (k) Zn@Co-C-16 h. (l) ε′, (m) ε″, (n) μ′ and (o) μ″ values of all Zn@Co-C. 2D RL values of Zn@Co-C obtained with etching time of (p1) 0 h, (p2) 2 h, (p3) 4 h, (p4) 8 h and (p5) 16 h, respectively.

Fig. 3. (a) XRD patterns, (b) Raman spectra of all Co@Zn-C. (c) XPS Co 2p spectra of Co@Zn-C obtained with etching time of 4 h and 16 h. (d) XPS Zn 2p spectra of Co@Zn-C obtained with etching time of 0 h, 4 h and 16 h. (e) SEM images of all Co@Zn-C. (f) Schematic illustration of Co2+ etching Zn-ZIF mechanism and (g) corresponding pyrolysis products obtained with increasing etching time. EDX spectra of (h) Co@Zn-C-0 h and (i) Co@Zn-C-16 h. HRTEM and SAED images of (j) Co@Zn-C-0 h and (k) Co@Zn-C-16 h. (l) ε′ and ε″ values of all Co@Zn-C. 2D RL values of Co@Zn-C obtained with etching time of (m1) 0 h, (m2) 2 h, (m3) 4 h, (m4) 8 h and (m5) 16 h, respectively.

Fig. 4. |Zin/Z0| curves of Zn@Co-C and Co@Zn-C obtained with etching time for (a1) 0 h, (a2) 2 h, (a3) 4 h, (a4) 8 h and (a5) 16 h. (b) α curves of Zn@Co-C and Co@Zn-C. (c) Average values for ε′ and ε″ of Zn@Co-C and Co@Zn-C. (d) Schematic representation of simultaneous manipulation of composition and construction toward Zn/Co hybrid.

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