Abstract Commonly, one typical performance of the materials can be fully utilized in a certain field due to the particular physical or chemical properties. In this work, a multifunctional novel necklace-like three-dimension (3D) Fe3O4/CNTs nanocomposite with carbon nanotubes (CNTs) threading into homogeneous spherical Fe3O4 nanoparticles have been fabricated by a one-pot hydrothermal method. The good intrinsic magnetic and dielectric properties for the 3D Fe3O4/CNTs nanocomposites lead to their outstanding microwave absorption performances (minimum RL value of −59.2 dB with a thin thickness of 1.68 mm). Furthermore, high electrical conductivity and fast surface redox are also observed in these Fe3O4/CNTs nanocomposites resulting in their excellent electrochemical properties (specific capacitance of 361.1 F g−1 at 0.5 A g−1). This work indicates that the distinct physical and chemical properties can be realized in the same composite structure by the suitable composite technology, which can not only improve the material utilization but also enable the preparation of multifunctional devices.

中文翻译：

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用于微波吸收和超级电容器的碳纳米管螺纹上的项链状 Fe3O4 纳米颗粒珠

摘要 通常，材料的一种典型性能由于其特殊的物理或化学性质，可以在某一领域得到充分利用。在这项工作中，通过一锅水热法制造了一种多功能新型项链状三维 (3D) Fe3O4/CNTs 纳米复合材料，其中碳纳米管 (CNTs) 穿入均匀的球形 Fe3O4 纳米颗粒中。3D Fe3O4/CNTs 纳米复合材料良好的固有磁性和介电性能导致其出色的微波吸收性能（最小 RL 值为 -59.2 dB，薄厚度为 1.68 mm）。此外，在这些 Fe3O4/CNTs 纳米复合材料中还观察到高导​​电性和快速表面氧化还原，导致它们具有优异的电化学性能（0.5 A g-1 时的比电容为 361.1 F g-1）。