Abstract
A series of N-doped carbon nanotubes (NCNTs) have been synthesized via a temperature-controlled annealing of polypyrrole (PPy) hierarchical nanostructures. The microstructures, dielectric properties and microwaves response behavior of these NCNTs were systematically investigated. The results indicate that initial pyrrolic N in PPy was gradually converted into pyridinic and graphitic N during the annealing process. NCNT prepared at 700 °C exhibits excellent broadband microwave absorption performance, where its effective absorption bandwidth (reflection loss value lower than − 10 dB) reaches 8.20 GHz in the frequency range of 9.80–18.00 GHz. A model refers to conductive loss and polarization relaxation was adopted to explain the high-performance microwave absorption. This research greatly expands the development of N-doped CNTs for the application in microwave areas.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 51702161, 11975124, and 61801511), and the Fundamental Research Funds for the Central University (No. AE89926).
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Yang, Z., Xia, Y., Zhou, Z. et al. Dielectric properties and microwaves response behavior of polypyrrole-derived N-doped carbon nanotubes. J Mater Sci: Mater Electron 32, 25820–25828 (2021). https://doi.org/10.1007/s10854-020-04799-1
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DOI: https://doi.org/10.1007/s10854-020-04799-1