Controllable Preparation\nof Helical Carbon Nanofibers\nfor Electromagnetic Wave Absorption

Abstract

Helical carbon nanofibers (HCNFs) with enhanced wave-absorbing\nproperties are successfully prepared by a combustion method catalyzed\nby Sn-MOF and with an appropriate amount of water as the combustion\nadditive. A series of characterization methods, such as X-ray diffraction,\nRaman spectroscopy, scanning electron microscopy, and transmission\nelectron microscopy, consistently show that microstructures suitable\nfor microwave absorption and scattering are formed in the prepared\nHCNFs with a relatively uniform size. The microwave absorption properties\nof these HCNFs are investigated in detail in this study. The HCNF-0.25,\nHCNF-0.5, and HCNF-0.75 samples showed much better microwave absorbing\ncapacity compared with the HCNF-0 sample under the filling ratio of\n20 wt %. The HCNF-0.75 sample exhibited a minimum reflection of −54.445\ndB at 2.4 mm. Overall, this work provides valuable insights for more\nin-depth exporting of dielectric loss to enhance the microwave absorption\nproperties of the nanomaterials.