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
Hauptverfasser: Xu, Suqiong, Yao, Zhiqian, Zhang, Xianke, Yuan, Jujun, Rong, Chuicai, Xiong, Zuzhou, Zhu, Xiurong, Yu, Yi, Yu, Huajun, Kang, Shuying, Kuang, Fangguang
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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. [Display omitted]
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2023.112284