Auricularia-shaped MoS2 nanosheet arrays coated hierarchical multilayer MoS2/PPy/rGO composites for efficient microwave absorption

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 479; p. 147613
• Main Authors: Liu, Shiqiao, Fang, Debao, Xing, Fangyuan, Jin, Haibo, Li, Jingbo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2024
• Subjects: Auricularia-shaped MoS2 nanosheet arrays; Dielectric loss; Microwave absorption; MoS2/PPy/rGO composites; Multi-layered hierarchical structure; Dielectric loss; Microwave absorption; Multi-layered hierarchical structure; Auricularia-shaped MoS2 nanosheet arrays; MoS2/PPy/rGO composites
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2023.147613

•Hierarchical multilayer MoS2/PPy/rGO are synthesized by hydrothermal method.•PPy decorates rGO, avoiding rGO stacking and guiding MoS2 nanosheets to grow vertically.•The thicket of auricularia-shaped MoS2 nanosheets promotes interface polarization and improves impedance matching.•MPG-10 achieves an RLmax of −53.5 dB (2.07 mm) and EAB of 5.36 GHz (1.82 mm) The rapid development of electronic technology has exacerbated electromagnetic pollution. It's crucial to develop efficient microwave-absorbing (MA) materials for blocking electromagnetic damage to electronic instruments and human health. However, simple structure MA materials usually have limited microwave absorption capacities and cannot simultaneously meet requirements for lightweight, wide bandwidth, and high loss. Constructing hierarchical structure composites and thereby introducing multiple absorption mechanisms is an effective way to improve the MA performance. In this study, we synthesized an auricularia-shaped MoS2 nanosheet array coated hierarchical multilayer MoS2/PPy/rGO (MPG) composite by a facile hydrothermal method. In the preparation process, using PPy to modify the rGO surface plays a key role, which effectively avoids rGO agglomeration and provides substrates for MoS2 nanosheets to grow on. The thicket of MoS2 nanosheets creates numerous nanoscale interfaces, promoting interface polarization and improving impedance matching. The multilayer heterogeneous structure facilitates multiple reflections and scattering, further attenuating electromagnetic waves. By optimizing the addition of PPy, the material's microstructure and microwave absorption performance were improved. The MPG-10 sample achieved the best reflection loss of −53.5 dB (2.07 mm thickness) and an effective absorption bandwidth of 5.36 GHz (1.82 mm thickness). This work contributes a new idea for the structural design of graphene-based hierarchical heterogeneous microwave absorption materials.