Abstract
In this research, three-dimensional (3D) hierarchical networks of magnetic carbon nanotubes/graphene oxide (CNTs/GO) nanocomposites (NCs) were synthesized by a one-step hydrothermal method with the idea of constructing more interface contacts, double loss mechanism and synergy effect. The obtained results showed that the content of NCs gradually transitioned from CoCO3 to CoxFe3-xO4. And CoCO3-CoxFe3-xO4/CNTs/GO quaternary NCs and CoxFe3-xO4/CNTs/GO ternary NCs could be selectively synthesized when the Co:Fe molar ratio decreased from 1:1 to 1:3. The as-prepared samples displayed excellent microwave absorption properties (MAPs) in terms of the minimum reflection loss (RLmin) and the corresponding absorption bandwidth (FBcor) with the reflection loss values lower than -10 dB. The RLmin and large FBcor values for the as-prepared samples were -54.69 dB and 2.36 GHz, -63.99 dB and 2.48 GHz, -63.36 dB and 2.68 GHz, respectively. The designed 3D hierarchical networked structure of magnetic GO/CNTs NCs displayed outstanding comprehensive MAPs, which could deliver a practical and effective strategy to develop high-performance microwave absorbers, taking into account their low cost, lightweight, and high stability.
Highlights
In the past decades, microwave absorbers (MAs) have drawn significant attention owing to the expanded electromagnetic (EM) radiation and interference problems (Novoselov et al, 2004; Zhang et al, 2014; Cao et al, 2019)
In confirmation of the results, the experimental conditions were kept the same, with the exception of 5 mmol FeCl36H2O, which was used as the Fe source to produce the sample, S4 for easy description
Based on the obtained EM parameters, reflection loss (RL) curves and the previously reported mechanisms for the interpretation of the good microwave absorption properties (MAPs) (Liu et al, 2012, 2020), the excellent MAPs of the as-prepared magnetic carbon nanotubes/graphene oxide (CNTs/graphene oxide (GO)) NCs can be explained by the geometrical effect
Summary
Microwave absorbers (MAs) have drawn significant attention owing to the expanded electromagnetic (EM) radiation and interference problems (Novoselov et al, 2004; Zhang et al, 2014; Cao et al, 2019). CoNi@Air@TiO2 (Liu et al, 2016), Co0.6Fe2.4O4@MoS2 (Long et al, 2019), Ni@SnO2 (Zhao et al, 2016), Co7Fe3@SiO2 (Chen et al, 2017) have been demonstrated to display outstanding microwave absorption properties (MAPs). Owing to their excellent synergistic effect, the development of high-performance MAs mainly focused on core@shell structure magnetic NCs, in which dielectric substances are utilized as a shell and magnetic NPs as a core. The as-prepared composites were measured by a vector network analyzer (Agilent E8363B) in the frequency region of 2–18 GHz
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