 This research has developed a new type of composite material consisting of carbon nanotubes, iron nanoparticles, and a 2D hierarchical carbon network. The carbon nanotubes are used to enhance the electrical conductivity of the material while the iron nanoparticles act as antennas to increase the material's ability to absorb microwaves. Additionally, the 2D hierarchical structure helps to optimize impedance matching and multiple scattering, resulting in improved microwave absorption performance. This material was tested at 800 degrees Celsius and demonstrated the best reflection loss, minus 58.5 dB, compared to other materials, making it a promising candidate for future applications. This article was authored by Zhongiluo, Zhaohao Wang, Jin Chua Lu, and others.