AUTHOR=Wu Mei , Qi Xiaosi , Xie Ren , Qin Shuijie , Deng Chaoyong , Zhong Wei 

TITLE=Magnetic Carbon Nanotubes/Graphene Oxide Nanocomposites: One-Step Controllable Production, and Their Excellent Microwave Absorption Capabilities

JOURNAL=Frontiers in Materials

VOLUME=7

YEAR=2020

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2020.00100

DOI=10.3389/fmats.2020.00100

ISSN=2296-8016

ABSTRACT=<p>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, a double loss mechanism and synergy effect. The obtained results showed that the content of NCs gradually transitioned from CoCO<sub>3</sub> to Co<italic><sub><italic>x</italic></sub></italic>Fe<sub>3</sub><sub>–</sub><italic><sub><italic>x</italic></sub></italic>O<sub>4</sub>. Further, CoCO<sub>3</sub>-Co<italic><sub><italic>x</italic></sub></italic>Fe<sub>3</sub><sub>–</sub><italic><sub><italic>x</italic></sub></italic>O<sub>4</sub>/CNTs/GO quaternary NCs and Co<italic><sub><italic>x</italic></sub></italic>Fe<sub>3</sub><sub>–</sub><italic><sub><italic>x</italic></sub></italic>O<sub>4</sub>/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 (RL<sub><italic>min</italic></sub>) and the corresponding absorption bandwidth (FB<sub>cor</sub>) with reflection loss values lower than −10 dB. The RL<sub><italic>min</italic></sub> and large FB<sub>cor</sub> 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 (MAs), considering their low cost, lightweight, and high stability.</p>