Abstract
CeO2/multi-walled carbon nanotubes (CeO2/MWCNTs) composites were successfully synthesized via one-step hydrothermal method. The crystal morphology, structure and electromagnetic parameters of the composites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, high-resolution transmission electron microscopy and vector network analyzer. The microwave absorption performances of CeO2/MWCNTs composites can be evaluated between 2 and 18 GHz frequency range, which is based on transmission line theory. The results demonstrated that fluorite CeO2 nanoparticles were anchored on MWCNTs. The CeO2/MWCNTs composites can reach the minimum reflection loss of − 34.64 dB at 16.24 GHz under the coating thickness of 5 mm, and the frequency bandwidth exceeding − 10 dB was 2.88 GHz. The microwave absorbing properties of the CeO2/MWCNTs composites were mainly attributed to the synergistic effect of dielectric and conductive loss, which were caused by the oxygen vacancies of CeO2. Moreover, charge polarization and interfacial polarization occurring in the composites are beneficial to microwave absorption.
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