Facile preparation of CoFe alloy/carbonized bamboo fibers for broadband microwave absorption

Multi-component design and microstructural regulation are commonly used strategies by researchers to improve the microwave absorption performance of materials, and it is essential to simultaneously explore sustainable and economical raw materials as well as simple preparation methods. In this study, the economical and sustainable bamboo fibers were used as a carbon source and template, and the CoFe alloy/carbonized bamboo fibers with different content were successfully prepared by the impregnation method and calcination method by controlling the nitrate concentration and calcination temperature. The analysis results display that the appropriate CoFe alloy content on carbonized bamboo fibers with nanopores can effectively improve the electromagnetic impedance matching and electromagnetic loss, resulting in excellent microwave absorption performance. The effective bandwidth almost simultaneously covers the X-band and Ku-band. This study not only facilitates the resource utilization of plant fibers, but also provides a new idea for the research of inexpensive, lightweight, and broadband microwave-absorbing materials.