J. Mater. Sci. Technol. ›› 2024, Vol. 175: 194-203.DOI: 10.1016/j.jmst.2023.08.020

• Research article • Previous Articles     Next Articles

Hollow engineering of sandwich NC@Co/NC@MnO2 composites toward strong wideband electromagnetic wave attenuation

Chenhao Weia,b, Lingzi Shia, Maoqing Lib,*, Mukun Hea, Mengjie Lib, Xinrui Jingb, Panbo Liua, Junwei Gua,*   

  1. aShaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China;
    bShaanxi Coal Chemical Industry Technology Research Institute Co., Ltd., Xi'an 710123, China
  • Received:2023-06-19 Revised:2023-08-18 Accepted:2023-08-26 Published:2024-03-10 Online:2023-09-06
  • Contact: *E-mail addresses: limaoqing_sxccti@163.com (M. Li), gjw@nwpu.edu.cn (J. Gu)

Abstract: Multiple hetero-interfaces would strengthen interfacial polarization and boost electromagnetic wave absorption, but still remain the formidable challenges in decreasing filler loadings. Herein, sandwich NC@Co/NC@MnO2 composites with hollow cavity, multiple hetero-interfaces, and hierarchical structures have been fabricated via the cooperative processes of self-sacrifice strategy and sequential hydrothermal reaction. In the sandwich composites, middle magnetic components (Co/NC) are wrapped by inner N-doped carbon (NC) matrix and outer hierarchical MnO2 nanosheets. Importantly, hollow engineering of sandwich composites with multiple hetero-interfaces greatly facilitates the enhancement of absorption bandwidth without sacrificing the absorption intensity. The maximum reflection loss of sandwich NC@Co/NC@MnO2 composites reaches -44.8 dB at 2.5 mm and the effective bandwidths is achieved as wide as 9.6 GHz at 2.3 mm. These results provide us a new insight into preparing efficient electromagnetic wave absorbers by interface engineering and hollow construction.

Key words: Interface engineering, Sandwich structure, Hetero-interfaces, Interfacial polarization, Electromagnetic wave absorption