表面修饰工程优化多壁碳纳米管微波吸收性能OA

The rapid development of electromagnetic wave technology demands high-performance absorbing materials.Carbon nanotubes are widely used for absorption due to strong conduction loss from high electrical conductivity losses,but single loss mechanism limits the further performance improvement.By systematically comparing and analyzing the microwave absorption properties of pristine multi-walled carbon nanotubes(MWCNTs),hydroxyl-functionalized carbon nanotubes,and carboxyl-functionalized carbon nanotubes,the role of induced polarization loss in enhancing electromagnetic dissipation was clarified.Carboxyl-functionalized carbon nanotubes show a 94%wider absorption bandwidth and an 80%higher absorption intensity than the pristine multi-walled carbon nanotubes.The minimum reflection loss reaches-60.99 dB at 3.8 mm thickness.Density functional theory calculations reveal that polar functional groups enhance dipole polarization synergistically.This improvement significantly strengthens interfacial polarization and loss properties,providing new theoretical perspectives and research avenues for the polarization mechanism of the surface functional groups regulation of carbon nanotubes.