Regulating Microwave Absorption Performance of Multi-walled Carbon Nanotubes Based on Defect Engineering

doi:10.12068/j.issn.1005-3026.2025.20240203

Abstract

Abstract:

To improve the microwave absorption performance of multi-walled carbon nanotubes （MWCNTs）， a defect engineering strategy was employed by introducing structural defects to modulate defect density through nitric acid treatment with varying concentrations. The results demonstrate that sample treated with 7.32 mol/L nitric acid achieves a minimum reflection loss of -43.8 dB at 13.3 GHz and an effective absorption bandwidth of 3.3 GHz， significantly outperforming both pristine and over-etched samples. Moderate defect density enhances microwave absorption performance， while excessive etching degrades the graphitic structure and deteriorates performance. This approach， based on defect modulation in a single material rather than traditional composite material design， not only simplifies the fabrication process but also provides new insights for optimizing the performance of microwave absorbing materials.

Key words: microwave absorbing material, multi-walled carbon nanotube, defect engineering, defect density, microwave absorption

CLC Number:

TB 34

Yi-xing LI, Pu ZHANG, Zhuo SUN, Xue-feng ZHANG. Regulating Microwave Absorption Performance of Multi-walled Carbon Nanotubes Based on Defect Engineering[J]. Journal of Northeastern University(Natural Science), 2025, 46(8): 133-139.

Figures/Tables 6

Fig.1 Characterization of phase composition and Raman spectrum analysis of the samples

Fig.2 TEM images of the samples

Fig.3 Scattering parameters of the samples

Fig.4 Complex dielectric constant and complex permeability of the samplesε'f=12πfτε"f+ε∞. （6）

Fig.5 Relationship between ε' and B0

Fig.6 Microwave absorption performance of samples

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