posted on 2023-01-11, 22:04authored byHao Wang, Jiarui Zhao, Zhen Wang, Panbo Liu
Newly emerged two-dimensional transition metal carbides
and/or
nitrides (MXenes) have attracted considerable interest in the field
of electromagnetic wave absorption, but their excessive conductivity
and single loss mechanism limit their applicability. Herein, an MXene
decorated with SiCNWs@Co/C was prepared by in situ growth
and carbonization processes, followed by electrostatic self-assembly.
The electromagnetic wave absorption performance of MXene@SiCNWs@Co/C with a bird-nest-like structure could be effectively regulated
and optimized by changing the proportion of MXene and SiCNWs@Co/C. The prepared MXene@SiCNWs@Co/C hybrid absorbers
reveal superior impedance matching, complementary dissipation mechanism,
and plentiful heterointerfaces. Profiting from the synergy of abovementioned
factors, the resultant MXene@SiCNWs@Co/C absorber exhibits
an optimum reflection loss (RL) value of −76.5 dB at 6.36 GHz
under a thickness of 3.9 mm and broad effective absorption bandwidth
(EAB, RL ≤ −10 dB) of 6.2 GHz (11.8–18.0 GHz)
with a thickness of only 2.0 mm, covering the entire Ku band. This
work offers new insights into designing and fabricating highly efficient
MXene-based electromagnetic absorbers.