Rambutan-like Nb₂O₅ coated single-layer hollow carbon spheres (Nb₂O₅@SHCs) with unique morphology were synthesized by using SHCs as template via a simple hydrothermal method. The as-fabricated rambutan-like Nb₂O₅@SHCs presents improved electromagnetic wave (EMW) absorption performance, especially strong reflection loss (RL) and wide effective absorption bandwidth (EAB, RL < −10 dB). The minimum reflection loss (RL_min) reaches −52 dB at the thickness of 3.25 mm, and the widest EAB is up to 5.28 GHz at a thin thickness of 2.85 mm. The improved EMW absorption capacity of Nb₂O₅@SHCs is mainly resulting from increased multiple reflections and scattering, strengthened interface polarization, and improved impedance matching. The rambutan-like Nb₂O₅@SHCs reveals great application prospects as a high-performance EMW absorbing material.

以SHCs为模板，通过简单的水热法合成了具有独特形态的红毛丹状Nb ₂ O ₅包覆单层空心碳球（Nb ₂ O ₅ @SHCs）。制成的类似红毛丹的Nb ₂ O ₅ @SHCs具有改善的电磁波（EMW）吸收性能，尤其是强的反射损耗（RL）和宽的有效吸收带宽（EAB，RL <-10 dB）。在3.25 mm的厚度下，最小反射损耗（RL _min）达到-52 dB，在2.85 mm的薄厚度下，最宽的EAB高达5.28 GHz。提高了Nb ₂ O _5的EMW吸收能力@SHCs主要是由于多重反射和散射增加，界面极化增强和阻抗匹配改善所致。像红毛丹一样的Nb ₂ O ₅ @SHCs作为一种高性能的EMW吸收材料，具有广阔的应用前景。