The exploration of ultra-wideband electromagnetic shielding materials is still a huge challenge to eliminate electromagnetic interference from various frequencies electronic devices in military and civil fields. Herein, a free-standing graphene...
Heterostructures
with a rich phase boundary are attractive for surface-mediated microwave
absorption (MA) materials. However, understanding the MA mechanisms
behind the heterogeneous interface remains a challenge. Herein, a
phosphine (PH3) vapor-assisted phase and structure engineering
strategy was proposed to construct three-dimensional (3D) porous Ni12P5/Ni2P heterostructures as microwave
absorbers and explore the role of the heterointerface in MA performance.
The results indicated that the heterogeneous interface between Ni12P5 and Ni2P not only creates sufficient
lattice defects for inducing dipolar polarization but also triggers
uneven spatial charge distribution for enhancing interface polarization.
Furthermore, the porous structure and proper component could provide
an abundant heterogeneous interface to strengthen the above polarization
relaxation process, thereby greatly optimizing the electromagnetic
parameters and improving the MA performance. Profited by 3D porous
heterostructure design, P400 could achieve the maximum reflection
loss of −50.06 dB and an absorption bandwidth of 3.30 GHz with
an ultrathin thickness of 1.20 mm. Furthermore, simulation results
confirmed its superior ability (14.97 dB m2 at 90°)
to reduce the radar cross section in practical applications. This
finding may shed light on the understanding and design of advanced
heterogeneous MA materials.
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