Homogeneous-heterogeneous interfaces in 2D/2D CoAl/Co9S8/Ni3S4 heterostructures for electromagnetic wave absorption

Xiaojun Zeng; Tianli Nie; Chao Zhao; Ronghai Yu

doi:10.1016/j.jcis.2023.06.041

Homogeneous-heterogeneous interfaces in 2D/2D CoAl/Co₉S₈/Ni₃S₄ heterostructures for electromagnetic wave absorption

J Colloid Interface Sci. 2023 Oct 15:648:940-950. doi: 10.1016/j.jcis.2023.06.041. Epub 2023 Jun 12.

Authors

Xiaojun Zeng¹, Tianli Nie², Chao Zhao², Ronghai Yu³

Affiliations

¹ School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China. Electronic address: zengxiaojun@jcu.edu.cn.
² School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China.
³ School of Materials Science and Engineering, Beihang University, Beijing 100191, China.

PMID: 37329605
DOI: 10.1016/j.jcis.2023.06.041

Abstract

Exploring electromagnetic wave (EMW) absorbers with ultrathin matching thickness (d ≤ 1.5 mm), strong reflection loss (R_L ≤ -50 dB), and wide effective absorption bandwidth (EAB, R_L ≤ -10 dB) is urgent and essential for reducing EMW radiation and interference. Herein, a 2D/2D CoAl/Co₉S₈/Ni₃S₄ heterostructure was constructured using simple hydrothermal and pyrolysis methods. 2D porous CoAl nanosheets and 2D Co₉S₈/Ni₃S₄ ultrathin nanosheets are assembled by small nanoparticle chains. Strikingly, the CoAl/Co₉S₈/Ni₃S₄ heterostructure exhibits remarkable EMW absorption performance with a R_L value of -61.56 dB, a high EAB of 4 GHz, and an ultrathin matching thickness of 1.25 mm. Mechanism investigations reveal that the CoAl/Co₉S₈/Ni₃S₄ heterostructure delivers dual metal sulfides behavior, high specific surface area, strong interactions, rich defects (N doping), and abundant homogeneous and heterogeneous interfaces, which promote good impedance matching, dielectric loss (interface polarization, conductive loss, and dipole polarization), as well as magnetic loss (natural resonance, exchange resonance, and eddy current loss) characteristics. This work can provide insights into the mechanism of dual metal sulfides used as high-performance EMW absorbers and deepen our understanding of the design and application of 2D/2D heterostructures.

Keywords: 2D/2D heterostructures; Dual metal sulfides; Electromagnetic wave absorption; Homogeneous and heterogeneous interfaces; Ultrathin matching thickness.