Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 864, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158141
Keywords
Electromagnetic wave absorption; Ternary composites; Co3O4; CeO2; Carbon nanotubes
Categories
Funding
- National Natural Science Foundation of China [21902085]
- Natural Science Foundation of Shandong Province [ZR2019QF012]
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The Co3O4/CeO2/CNTs composites showed enhanced electromagnetic wave absorption properties compared to pure CNTs, with improved impedance matching and multiple polarization relaxations. The minimum reflection loss of the composites reached -59.82 dB at a thin thickness, and they exhibited a broad effective absorption bandwidth in a specified frequency range. These results suggest that the Co3O4/CeO2/CNTs composites are promising candidates for electromagnetic wave absorption.
Co3O4/CeO2 nanoparticles decorated CNTs (Co3O4/CeO2/CNTs) composites were synthesized by a one-step hydrothermal route. The micro-structure examinations of the ternary composites indicated that the CeO2 and Co3O4 nanoparticles with size ranges of 5-10 nm were homogeneously deposited onto the CNTs surface. When applied for the attenuation of electromagnetic (EM) wave, the ternary Co3O4/CeO2/CNTs composites exhibit enhanced EM wave absorption properties than pure CNTs and previously reported CNTs based composites owing to the improved impedance matching and multiple polarization relaxations. The minimum reflection loss (RL) of the ternary composites reached - 59.82 dB at 11.92 GHz with a thin thickness of 1.73 mm, and the effective absorption bandwidth (RL < - 10 dB) covered as broad as 5.20 GHz (12.76-17.96 GHz) for a thickness of only 1.42 mm. These results demonstrated that the as-prepared Co3O4/CeO2/CNTs composites with a facile synthetic process and strong absorption performance could be a promising candidate for EM wave absorption. (C) 2020 Elsevier B.V. All rights reserved.
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