3d Skeletal Porous Nanocage of Ternary Metallic Oxide with Excellent Electromagnetic Wave Absorption

Abstract

With the development of radio technology, great efforts have been made to manufacture high-performance electromagnetic wave (EMW) absorbers for electronic information security, anti-reconnaissance stealth technology, and human health. Reaching both excellent impedance matching and electromagnetic (EM) energy dissipation at the same time is still a challenge in EMW absorption materials. In this study, we designed a 3D skeletal porous nanocage structure by Co-Fe-Ni ternary metal oxide (CFN-TMO) to improve the impedance matching and guarantee sufficient EM energy dissipation of EMW absorption nanomaterials at the same time. The integrity of the 3D skeletal nanocage structures and pore size on the cage wall could be manipulated by the calcination temperature to modify the EMW absorption abilities. The best performance is obtained with a suitable surface porous size and complete skeleton structure, with a high reflection loss (RL) of -67.2 dB and an ultra-wide effective absorption bandwidth (EAB) of 8.2 GHz. The outstanding EMW absorption ability is mainly attributed to the nanocage structure, which optimizes the impedance matching and induces multiple reflections of the material. The skeleton constructed by the Co-Fe-Ni ternary metal oxide also improves the EMW absorption ability by introducing a large number of interfaces, lattice defects, and oxygen vacancies to enhance dielectric loss. This work reveals the nanostructure design for optimizing the impedance matching could greatly increase the EMW absorption thus provides important mechanism guidelines for the design and fabrication of light and high-performance EMW absorption nanomaterials.

Keywords: 3D skeletal porous nanocages, Co-Fe-Ni ternary metallic oxide, Electromagnetic wave absorption, impedance matching