Abstract
As a candidate of electromagnetic wave (EW) absorption materials (EAM), carbon nanotubes (CNT) possess stronger dielectric loss capacity for EM. However, the exorbitant conductivity of CNT could induce the impedance mismatch, leading to extreme EW reflections and poor EW absorption performance. In this paper, three imidazole-based ionic liquids (IMIL), 1-butyl-3-methylimidazolium tetrafluoroborate (BIMBF4); 1-butyl-3-methylimidazolium hexafluorophosphate (BIMPF6) and 1-propylsulfonic-3-methylimidazolium tosylate (PIMSO3TS), are combined with CNT to obtain the imidazole-based ionic liquids/CNT composites (IMIL/CNT) through the facile mixture. Remarkably, the IMIL not only optimize the CNT of impedance match but also dissipated the EM through ionic conductance and polarization loss. Based on these, three IMIL/CNT based EW absorbers composited with paraffin show favorable EW absorption performance. The minimum Reflection loss (RLmin) of the BIMBF4/CNT, PIMSO3TS/CNT, and BIMPF6/CNT based EW absorber with a thickness of 2.2–2.3 mm could reach − 46 dB, -45 dB and − 35 dB, respectively. The maximum effective absorbing bands (EABmax) of BIMBF4/CNT, PIMSO3TS/CNT and BIMPF6/CNT based EW absorbers are 4.7 GHz at 1.5 mm, 4.8 GHz at 1.8 mm and 4.8 GHz at 1.8 mm. This work paves a new way to improve the EW absorbing performance of carbon nanotubes.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (grant no. 51673154).
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CL: Conceptualization, Methodology, Investigation, Data curation, Writing –original draft. SZ: Data curation, Writing – review & editing. JY: Visualization, Investigation. JW: Writing – review & editing. BZ: Data curation. CX: Project administration, Funding acquisition.
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Li, C., Zhang, S., Yi, J. et al. Facile-prepared imidazole-based ionic liquid/CNT composites with high-electromagnetic wave absorption performance. J Mater Sci: Mater Electron 34, 1306 (2023). https://doi.org/10.1007/s10854-023-10637-x
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DOI: https://doi.org/10.1007/s10854-023-10637-x