In
this work, a three-dimensional (3D) porous MXene/GO foam (MGOF) was
successfully synthesized and exhibited an excellent terahertz stealth
property covering a whole measurement frequency of 0.2–2.0
THz. This is due to the ingenious assembly of two functional two-dimensional
materials that have different advantages. The multiscale micro-nanostructure
constructed with the 3D porous MGOF can effectively increase the terahertz
scattering and refraction. Furthermore, MXene sheets with high conductivity
can enhance the responsiveness to the terahertz wave. By adjusting
the content of MXene in the MGOF, it exhibits a maximum reflection
loss (RL) of 37 dB with a 100% qualified frequency bandwidth (RL >
10 dB), which is the most outstanding result in the available reference.
In addition, the optimal average terahertz RL values of MGOF were
up to 30.6 dB, which is 100% higher than the best data presented in
previous work. Benefitting from an ultralow density, a high RL value,
and a wide bandwidth, the maximum specific average terahertz absorption
performance can reach 4.6 × 104 dB g–1 cm3, which is more than 4000 times that of other materials.
In addition, the regulation of the terahertz absorption property through
microstructure and morphology control is reported for the first time.
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