UV-modification of Ag nanoparticles on α-MoC for interface polarization engineering in electromagnetic wave absorption

• Published in: Nanoscale 2024-03, Vol.16 (12), p.6249-6258
• Main Authors: Zhu, Pengyuan, Kang, Yifan, Li, Xinglong, Yu, Haoquan, Liu, Tong, Song, Ming, Zhang, Yanan, Zhou, Lifan, Zhao, Ping, Huang, Wenhuan
• Format: Article
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/d3nr05917k

The design of electromagnetic wave absorbing materials (EWAMs) has aroused great attention with the express development of electromagnetic devices, which pose a severe EM pollution risk to human health. Herein, an Ag-doped MoCx composite was designed and constructed through a UV-light-induced self-reduction process. The UV-reduction time was controlled on the α-MoC polymer for 0.5-2 hours for modifying different amounts of Ag. As a result, α-MoC@Ag-1.5 exhibited the strongest RL min of −56.51 dB at 8.8 GHz under a thickness of 3.0 mm and the widest EAB of 4.96 GHz (12.16-17.12 GHz) covering a substantial portion of the Ku-band at a thickness of 2.0 mm due to the synergy of the conductivity loss and abundant interfacial polarization sites. Additionally, a new strategy for computer simulation technology was proposed to simulate substantial radar cross-sectional reduction values with real far-field conditions, whereby absorbing coatings with α-MoC@Ag-1.5 were proved to contribute to a remarkable radar cross-sectional reduction of 37.4 dB m 2 . Based on bimetallic HZIF-ZnMo, a high-performance electromagnetic wave absorbing material with comprehensive conductivity loss, polarization loss and dielectric loss was obtained by graphiting and UV-modified silver nanoparticles.