Heterostructure design of MoO2/FeCo/NPC nanocomposites via supramolecular self-assembly for efficient electromagnetic wave absorption

• Published in: Ceramics international Vol. 48; no. 19; pp. 28343 - 28354
• Main Authors: Zhang, Kaili, Zhang, Na, Liu, Ting, Wang, Yan, Zong, Meng, Chen, Weixing
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2022
• Subjects: Dielectric MoO2; EM wave Absorption; Heterogeneous nanostructures; P-Doped; Supramolecular self-assembly; Dielectric MoO2; P-Doped; Supramolecular self-assembly; EM wave Absorption; Heterogeneous nanostructures; N
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2022.06.142

To date, the development of high-efficiency absorbing materials is still the most effective method to solve increasingly serious problem of electromagnetic pollution. Herein, molybdenum dioxide/iron cobalt alloy/nitrogen phosphorus doped carbon (MoO2/FeCo/NPC) nanocomposites were prepared by combination of supramolecular self-assembly and carbonization. The microstructure, morphology and performance of MoO2/FeCo/NPC nanocomposites were characterized by various test methods. Maximum reflection loss (RL) reached −42.3 dB at 10.4 GHz and 2.1 mm thickness. Adjusting the thickness from 1.5 to 3 mm could achieve effective absorption bandwidth of 8.4 GHz. The dispersion of dielectric MoO2 in system generated synergistic effect with magnetic coupling network formed by FeCo nanoparticles. In addition, local charge accumulation caused by Schottky barrier between two interfaces also contributed to interface polarization. Moreover, internal oxygen vacancy defects and unique electric double layer structure on the surface of ionic crystal MoO2, as well as the existence of capacitor-like structure between carbon nanosheets further optimized absorption performance of MoO2/FeCo/NPC. Thus, such a satisfactory achievement is closely related to the unique morphology and structure of MoO2/FeCo/NPC and the synergistic effect of various components.