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- Title
Confined Tuning Hierarchical Core–Shell Architectures of Multi-Walled Carbon Nanotubes Wrapped by MnO<sub>2</sub> Sheets with High-Performance Microwave Absorption.
- Authors
Shi, Ran; Xing, Honglong; Liu, Ye; Ji, Xiaoli
- Abstract
Hierarchical core–shell architectures with multi-walled carbon nanotubes as core and MnO2 sheets shaped in an array mode as shell (MWCNTs@MnO2) were successfully synthesized via a simple wet chemical method. X-ray diffraction patterns and X-ray photoelectron spectroscopy analysis revealed that the composites were successfully prepared. Morphological characterizations were made by scanning electron microscopy and transmission electron microscopy. Vector network analyzer was employed to investigate the electromagnetic parameters of the composites. A possible attenuation mechanism was discussed, and the high-performance microwave absorption properties were attributed to the porous microstructure, polarization effect, dielectric loss and the synergistic action between MWCNTs and δ -MnO2. A minimum reflection loss (RL) of − 50.6 dB was achieved at a thickness of 1.4 mm, and an effective absorption bandwidth (RL < − 1 0 dB) covered 4.2 GHz (from 13.8 GHz to 18 GHz) at a thickness of 1.3 mm. Therefore, these results suggested that the MWCNTs@ δ -MnO2 composites can be an excellent candidate for microwave absorption materials. The cross-linked δ-MnO2 nanoflakes attached on the sidewalls of MWCNTs and the unique open porous 3D conductive structure of the nanocomposites contributed to the multiple reflections and scattering of microwaves in long propagation periods. Moreover, MWCNTs with high electrical conductivity can generate loss current and energy dissipation by electron migration and hop across the interfaces.
- Subjects
MULTIWALLED carbon nanotubes; SCANNING transmission electron microscopy; DOUBLE walled carbon nanotubes; SINGLE walled carbon nanotubes; X-ray photoelectron spectroscopy; TRANSMISSION electron microscopy; MICROWAVE scattering
- Publication
NANO, 2021, Vol 16, Issue 2, pN.PAG
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292021500223