Double salt-template strategy for the growth of N, S-codoped graphitic carbon nanoframes on the graphene toward high-performance electromagnetic wave absorption.

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. [Display omitted] • A double-salt template method was proposed for fabricating N, S-codoped carbon nanoframes (GF) on graphene (GS). • The GFs have a width of about 51 nm and a wall thickness of only 4.8 nm. • The graphene planes in GF and GS are perpendicular to each other, leading to numerous interfaces. • The effective absorption bandwidth of the designed absorbers reached 4.35 GHz. • The mechanism about the synergisty of interface and N, S co-doping was uncovered. [ABSTRACT FROM AUTHOR]