Surface-oxidized FeCo/carbon nanotubes nanorods for lightweight and efficient microwave absorbers

Publication date: 15 December 2017
Source:Materials & Design, Volume 136
Author(s): Bai Yang, Yue Wu, Xiaopan Li, Ronghai Yu
A facile one-step chemical synthesis has been reported to fabricate novel rod-like FeCo/carbon nanotubes (CNTs) nanocomposites, in which surface-oxidized FeCo nanoalloys are pinned on the CNTs walls and grow along their length direction to form 2D magnetic FeCo/CNTs nanorods. These CNTs-based nanorods constructed with the oxidized FeCo nanoalloys exhibit a very high coercivity of 376.9Oe due to analogous magnetic shape anisotropy resulting from the large CNTs length-diameter ratio. The dielectric properties for the FeCo/CNTs nanorods can be greatly tuned by different CNTs additions. Excellent wave absorbing properties, including a minimum reflection loss value of −46.5dB at 12.56GHz with a sample thickness of 1.7mm and a broad absorption bandwidth of 3.92GHz (below −10dB), are obtained for the FeCo/CNTs nanorods with 9wt% CNTs additions, which can be ascribed to good impedance matching from balanced dielectric and magnetic loss in the composites. These rod-like FeCo/CNTs nanocomposites also show low density and good structural stability and can be used as lightweight microwave absorption materials.

Graphical abstract

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