The low dielectric loss of mesoporous carbon hollow microsphere (PCHM) requires high filler loading (higher than 20 wt%) when it is used as microwave absorbers. In order to decrease the filler loading of PCHM, a new strategy for synergistic increase of polarization and conductive loss was developed by twining PCHM with carbon nanotube (CNT) according to theoretic calculation. By the optimization of CNT content, the minimum reflection coefficient was -34.6 dB with a filler loading of only 10 wt%, which was much lower than -2.1 dB of PCHM. In addition, the effective absorption bandwidth was 3.6 GHz at X band with a thickness of 2.8 mm. The enhanced microwave absorption performance can be ascribed to the unique combination of hollow PCHM and one-dimensional CNT with higher graphitization degree, leading to increase of conductivity and heterogeneous interfaces. As a result, the conductive loss increased from 0.12 to 2.27 and polarization loss increased from 0.15 to 0.67, achieving the balance between attenuation ability and impedance match.

介孔碳空心微球（PCHM）的低介电损耗在用作微波吸收剂时需要较高的填料填充量（高于20 wt％）。为了减少PCHM的填充量，根据理论计算，通过将PCHM与碳纳米管（CNT）缠绕在一起，开发了一种新的极化和导电损耗协同增加的新策略。通过优化CNT的含量，最小反射系数为-34.6 dB，填充剂含量仅为10 wt％，远低于PCHM的-2.1 dB。另外，X波段的有效吸收带宽为3.6GHz，厚度为2.8mm。增强的微波吸收性能可以归因于中空PCHM和具有更高石墨化度的一维CNT的独特结合，导致电导率和异质界面的增加。结果，导电损耗从0.12增加到2.27，极化损耗从0.15增加到0.67，实现了衰减能力和阻抗匹配之间的平衡。