期刊
CARBON
卷 202, 期 -, 页码 235-243出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2022.10.086
关键词
Salt-template; S-codoped; Graphitic carbon nanoframes; Density functional theory calculations; Electromagnetic wave absorption
A double-salt template method is used to fabricate N, S-codoped graphitic carbon nanoframes (GF) anchored on graphene sheets (GS). The numerous interfaces between the GF and GS enhance the electromagnetic wave absorption performance of the sample. The N, S-GF/GS exhibits excellent absorption performance at a low filler ratio, providing a promising approach for high-performance electromagnetic wave absorbers.
The increasingly serious electromagnetic radiation urgently call for high performance electromagnetic wave (EMW) absorbers. Hollow carbon nanostructures are promising for lightweight EMW absorbers. However, due to lack of sufficient polarization centers, the EMW absorption property of hollow carbon nanosturctures is still unsatisfactory. Herein, we develop a double-salt template method for fabrication of N, S-codoped graphitic carbon nanoframes (GF) that anchored on the graphene sheets (GS). The GFs in the sample (N, S-GF/GS) have a width of about 51 nm and a wall thickness of only 4.8 nm. Furthermore, the graphene plane in the GF is perpendicular to the graphene plane in the GS, leading to the formation of numerous interfaces between the graphene planes perpendicular to each other. Theoretical calculations indicate that the interfaces can induce the interfacial polarization loss, and the N, S co-doping can cause dipole polarization loss, both of which enhance the EMW absorption performance of the N, S-GF/GS. The minimal reflection loss and efficient absorption width of the N, S-GF/GS at a low filler ratio of 10 wt% are -45.64 dB at the matching thickness of 2.3 mm and 4.35 GHz with the thickness of 1.5 mm, respectively, superior to most of carbon-based absorbers. Our proposed method opens a promising way for high-performance EMW absorbers.
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