Regulating surfactant strategy to synthesize Co@NCNT nanocomposites with conductive networks towards excellent electromagnetic wave absorption
•The effect of surfactants on the morphology of Co-PBA was investigated.•Co@NCNT composites derived from PBAs with porous cubic structure were prepared.•The minimum reflection loss reached - 43.95 dB at a thickness of 2.05 mm.•The effective absorption bandwidth was 5.695 GHz at a thickness of 2.05 m...
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Veröffentlicht in: | Materials research bulletin 2023-09, Vol.165, p.112284, Article 112284 |
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Sprache: | eng |
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Zusammenfassung: | •The effect of surfactants on the morphology of Co-PBA was investigated.•Co@NCNT composites derived from PBAs with porous cubic structure were prepared.•The minimum reflection loss reached - 43.95 dB at a thickness of 2.05 mm.•The effective absorption bandwidth was 5.695 GHz at a thickness of 2.05 mm.•The excellent properties are attributed to the dielectric and magnetic synergy.
In this paper, Prussian blue analogues (PBAs) with different morphologies have been synthesized in a co-precipitation process with Na3C6H5O7·2H2O and polyvinyl pyrrolidone (PVP) as surfactant, and then the electromagnetic wave absorption (EMWA) properties of their derivatives obtained via a pyrolysis reaction were investigated. To explore the best suitable pyrolysis temperature, PBA precursor synthesized via the addition of Na3C6H5O7·2H2O was annealed at four different temperatures (550/650/750/850 °C) to obtain the cobalt encapsulated in nitrogen-doped carbon nanotube (Co@NCNT) nanocomposites. Our results show that when the pyrolysis temperature is 650 °C, the Co@NCNT shows a minimum reflection loss (RLmin) of - 43.95 dB at the thickness of 2.05 mm, and the effective absorption bandwidth reaches 5.695 GHz, spanning the X and Ku bands. The excellent EMWA property is ascribed to the synergistic effect of dielectric and magnetic loss.
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ISSN: | 0025-5408 1873-4227 |
DOI: | 10.1016/j.materresbull.2023.112284 |