Zinc aluminate nanoparticles modified with (D-xylose, adenine)-derived nitrogen-doped carbon nanosheet composites as high-efficiency microwave absorbents

Abstract

In this work, the ZnAl2O4/nitrogen-doped carbon nanosheet composites were prepared through a hydrothermal and pyrolysis method using D-xylose, adenine, zinc nitrate, and aluminum nitrate as raw materials. Results showed that a large number of interfaces inside the composite resulted in interfacial polarization and the formation of conductive networks between material particles, further increasing loss to microwaves; an appropriate ratio between reactants and the introduction of zinc aluminate can adjust the impedance matching of a material. When 0.2 g of nitrogen-doped carbon nanosheets was used, the minimum reflection loss was −40.8 dB at the sample matching thickness of 2 mm, and the maximum effective absorption bandwidth was 6 GHz.