Details

Autor(en) / Beteiligte

• Zhou, Panpan
• Zhang, Jing
• Song, Zhi
• Kuang, Yawei
• Liu, Yushen
• Wang, Lixi
• Zhang, Qitu

Titel

Defect engineering in N-doped OMC for lightweight and high-efficiency electromagnetic wave absorption

Ist Teil von

• Journal of Materiomics, 2024-01, Vol.10 (1), p.190-199

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Developing low density and efficient dielectric loss materials has become a research hotspot, which can greatly meet the demands of modern radars and settle the problem of electromagnetic wave pollution. Herein, a series of N-doped ordered mesoporous carbon (OMC) materials with different nitrogen content were prepared via a modified self-assembly method and defect engineering in subsequent calcination treatment. It was discovered that the content and type of nitrogen doping can be effectively modulated by the amount of precursor dicyandiamide, resulting in the changes in porous structure, carbon defects, electromagnetic properties, microwave absorption (MA) performance and radar cross section (RCS) reduction values. Remarkably, as-fabricated OMC/N2.5 displays ideal MA performance, whose minimum reflection loss (RLmin) value reaches −35.3 dB at 7.76 GHz (3.0 mm) and its effective absorption bandwidth reaches 3.52 GHz (10.64–14.16 GHz, 2.0 mm). Furthermore, the optimal RCS reduction values can be obtained as 12.01 dB m2 when the detection theta is 30°, which validly reduces the chances of being detected by radar. Thus, this work opens up a novel way for the development of lightweight and high-efficiency MA materials. [Display omitted] •The content and type of nitrogen doping can be modulated by the defect engineering, which can regulate MA performance.•The optimal RCS reduction value is 12.01 dB m2 (detection theta is 30°), reducing the chances of being detected by radar.•OMC/N2.5 achieves strong absorption (RLmin = −35.3 dB, 3.0 mm) and broad effective absorption bandwidth (3.52 GHz, 2.0 mm).