J. Mater. Sci. Technol. ›› 2024, Vol. 180: 1-11.DOI: 10.1016/j.jmst.2023.08.060

Special Issue: Electronic materials 2024 Films and coatings 2024 Electromagnetic wave absorbing materials

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Dual strategy of A-site ion substitution and self-assembled MoS2 wrapping to boost permittivity for reinforced microwave absorption performance

Ailing Fenga, Di Lanb, Jinkun Liuc, Guanglei Wuc,*, Zirui Jiad,*   

  1. aInstitute of Physics & Optoelectronics Technology, Baoji University of Arts and Sciences, Baoji 721016, China;
    bSchool of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan 442002, China;
    cInstitute of Materials for Energy and Environment, State Key Laboratory of Bio-Fibers and Eco-Textiles, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China;
    dCollege of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
  • Received:2023-07-24 Revised:2023-08-18 Accepted:2023-08-19 Published:2024-05-01 Online:2023-10-18
  • Contact: *E-mail addresses:. wuguanglei@qdu.edu.cn (G. Wu), jiazirui@qdu.edu.cn (Z. Jia)

Abstract: With the rapid development of electronic technology, how to effectively eliminate electromagnetic pollution has become a serious problem. Perovskite oxides have shown great potential in the field of electromagnetic wave absorption due to their unique structure and excellent physicochemical properties. Herein, by rationally manipulating the A-site ion substitution strategy, the theoretically directed doping of Sr ions into La ionic sites was utilized and the layered MoS2 was loaded by the hydrothermal process to modify its surface. Consequently, the introduced polarization phenomenon improved the dielectric performance of the perovskite oxides, achieving a collaborative dielectric/magnetic loss mechanism. Accordingly, the prepared La0.7Sr0.3FeO3(LSFO)/MoS2 as coating filler in the epoxy resin coating system can obtain the minimum reflection loss of -67.09 dB at 1.9 mm and the maximum effective absorption bandwidth of 7.28 GHz at 2.3 mm. More importantly, it also exhibits excellent absorption performance for multi-band electromagnetic waves, covering a wide range of specified frequency bands. It provides inspiration for exploring novel perovskite oxide-based electromagnetic wave absorbing coatings and broadens the choice of ideal candidate materials for designing highly efficient, multi-band absorbers to cope with sophisticated electromagnetic environments.

Key words: Perovskite oxides, A-site ion substitution, Multi-band, Electromagnetic wave absorbing coating