 This study investigated the use of a new type of polymer-based composite membrane structure to create high-performance microwave absorbers. The structure was composed of one-dimensional end-oped carbon nanofibers embedded within HoloCo3SNC0.7 nanocubes. The presence of space charge stacking between the nanoparticles allowed for the formation of a necklace structure, which could then be further enhanced by the presence of a carbon network. This combination of factors resulted in a high impedance matching and a large absorption bandwidth. When tested at 800 degrees Celsius, the necklace-like structure exhibited an RL value of minus 51.2 dB at 2.3 mm and a thickness of 2.5 mm. Furthermore, the multiple reflections and interfacial polarization between the fibers and their internal walls contributed significantly to the overall absorption of electromagnetic waves. This article was authored by Chenxi Wang, Yulu, Zheerwei Jia, and others. We are article.tv, links in the description below.