Multi-heterostructure composites of Fe3O4 coated Janus nanoparticles and MWCNTs with high microwave absorption

• Published in: Polymer testing Vol. 123; p. 108056
• Main Authors: Jin, Hengqian, Wei, Shufei, Zhang, Xinping, Nie, Huarong, He, Aihua
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2023; Elsevier
• Subjects: Carbon nanotubes; Heterostructure; Janus nanoparticles; Magnetic Fe3O4; Microwave absorption; Heterostructure; Magnetic Fe3O4; Carbon nanotubes; Microwave absorption; Janus nanoparticles
• ISSN: 0142-9418; 1873-2348
• DOI: 10.1016/j.polymertesting.2023.108056

Microwave-absorbing materials with heterostructure represent a major challenge and opportunity in enabling strong microwave absorption over a wide bandwidth. Here, novel hydrophilic multi-heterostructure composites (Mag@J/MWCNT) were fabricated by combining nanostructured Fe3O4 covered snowman-like Janus nanoparticles (Mag@J) with MWCNTs for enhanced microwave absorption. The good hydrophilicity and low reflection loss (RL) demonstrated the potential application of Mag@J as an effective microwave absorbent with environmentally friendly processibility. Further, the multi-heterostructure composites constructed by Mag@J (with 77.73 wt% Fe3O4) and MWCNTs exhibited strong absorption intensity (RL = −38.98 dB), wide bandwidth (6.04–8.23 GHz), and low thickness (3.5 mm). The excellent microwave absorption properties were attributed to the strong dielectric loss, magnetic loss, and good impedance matching of different components in multi-heterostructure composites, as well as multiple reflection absorption of microwave in the hollow sphere of Janus particle. Therefore, this work provides important inspiration for multi-heterostructure composites to achieve potential applications as electromagnetic wave absorbing materials. •Multi-heterostructure is composed of hydrophilic magnetic Fe3O4@Janus nanoparticles and MWCNTs.•Magnetic snowman-like particle shows good electromagnetic wave absorbing property.•Composite loading 77.73% Fe3O4 has optimum absorbing property with low thickness.•The absorbing property is owing to synergistic action of heterogeneous components.