J. Mater. Sci. Technol. ›› 2025, Vol. 212: 35-43.DOI: 10.1016/j.jmst.2024.06.018

• Research Article • Previous Articles     Next Articles

Hollow engineering in CoNi@Air@C@MoS2 multicomponent composites derived from bimetallic CoNi Prussian blue analogs for ultra-wide bandwidth and strong electromagnetic wave absorption

Ziqing Yanga, Qiqin Lianga, Xiaosi Qia,*, Beibei Zhana,*, Xiu Gonga, Yunpeng Qua, Junfei Dinga, Jing-Liang Yanga, Yanli Chena, Qiong Penga, Wei Zhongb,*   

  1. aCollege of Physics, Guizhou Province Key Laboratory for Photoelectrics Technology and Application, Guizhou University, Guiyang 550025, China;
    bNational Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, China
  • Received:2024-05-20 Revised:2024-06-13 Accepted:2024-06-15 Published:2025-03-20 Online:2025-03-14
  • Contact: *E-mail addresses: xsqi@gzu.edu.cn (X. Qi), bbzhan@gzu.edu.cn (B. Zhan), wzhong@nju.edu.cn (W. Zhong).

Abstract: In recent years, two-dimensional layered transition metal dichalcogenides-based multicomponent com-posites (MCCs) acting as electromagnetic wave (EMW) materials have received intensive investiga-tions. However, the vulcanication of metal greatly hindered their enhancement of EMW absorption per-formances (EMWAPs). Herein, a combined metal-organic frameworks-derived and hydrothermal strat-egy was presented to produce yolk-shell structure (YSS) CoNi@Air@C@MoS2 MCCs. The results showed that the thermal and hydrothermal treatments resulted in the generation of YSS and two-dimensional MoS2 nanosheets, which maintained the original morphology of CoNi Prussian blue analogues. The pro-tection of thick C layer well inhibited the vulcanization of inner CoNi alloy. The formed sheet-like MoS2 further optimized impedance matching characteristics, which led to the satisfactory EMWAPs of CoNi@Air@C@MoS2 MCCs. Furthermore, the EMWAPs could be further improved by optimizing the Ni:Co atom ratios CoNi@Air@C@MoS2 MCCs, which stemmed from their boosted impedance matching perfor-mances, EMW attention and polarization loss abilities. The absorption bandwidth and reflection loss val-ues for YSS CoNi@Air@C@MoS2 MCCs are 8 GHz and-60.83 dB, which covered almost all C-Ku bands. In general, our research work provided a valid strategy to produce YSS magnetic CoNi@Air@C@MoS2 MCCs with high efficiency, which well avoided the vulcanization of metal nanoparticles, made best of hollow engineering and atomic ratio optimization strategy to boost the comprehensive EMWAPs.

Key words: Hollow engineering, CoNi@Air@C@MoS2, Polarization loss, Ultra-wide bandwidth, Microwave absorption