Carbon nanotube (CNT) has a strong microwave (MW) attenuated ability due to its high ability of dielectric loss. However, the impedance mismatch of pure CNT-based absorber makes MW is earlier reflection than absorption. Herein, it is reported that the polyzwitterion wrapped CNT (PZ@CNT) with core–shell structure is prepared through in-situ polymerization of 1-vinyl-3-imidazole-propane sulfonate. Because the high polarity polyzwitterion shell layer in the polyzwitterion-wrapped CNTs (PZ@CNTs) optimizes the impendence match of CNT between airs and attenuates the energy of the microwave through the zwitterionic dipole and interfacial polarization loss. PZ@CNTs based MW absorbers composited with paraffin exhibit a minimum reflection loss (RL_min) of −44.5 dB with 1.9 mm thickness at 10.7 GHz and an effective absorption band of 4.2 GHz at a small thickness of 1.3 mm exceeding many of previously reported the wrapped CNTs with a single polymer. This work paves a new way to improve the microwave absorbing performance of Carbon nanotube.

碳纳米管（CNT）由于其高介电损耗能力而具有很强的微波（MW）衰减能力。然而，纯CNT基吸收体的阻抗失配使得MW比吸收更早地反射。在此，据报道，具有核壳结构的多两性离子包裹的碳纳米管（PZ@CNT）是通过1-乙烯基-3-咪唑-丙磺酸盐的原位聚合制备的。因为多两性离子包裹的 CNT (PZ@CNTs) 中的高极性多两性离子壳层优化了 CNT 在空气之间的阻抗匹配，并通过两性离子偶极子和界面极化损失衰减了微波的能量。与石蜡复合的基于 PZ@CNTs 的 MW 吸收剂表现出最小的反射损耗 (RL _min）在 10.7 GHz 时为 -44.5 dB，厚度为 1.9 mm，在 1.3 mm 的小厚度处有效吸收带为 4.2 GHz，超过了许多先前报道的用单一聚合物包裹的 CNT。该工作为提高碳纳米管的微波吸收性能开辟了一条新途径。