Abstract
Absorbing materials with a hollow structure are lightweight and possess excellent wave absorbing properties. In this study, natural ceiba fiber with hollow structure is used as a bio-template to prepare Cu/C absorbing fibers through impregnating and sintering processes. These hollow composite fibers exhibit excellent absorbing performance. Compared with the Cu-based absorbing materials with a solid structure, the Cu/C hollow fiber has a reflection loss of −51.34 dB. The strong absorption over a wideband can be attributed to the hollow structure that improves the impedance matching and enables multiple reflections and scattering of electromagnetic waves in the internal cavity to weaken the waves. In addition, the influence of the sintering temperature and impregnation-solution concentration on the hollow structures of Cu/C fibers is investigated. As a result, 1000 ℃ is identified as the optimal sintering temperature to achieve good absorption performance of Cu/C fibers prepared with different impregnation-solution concentrations.
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