Consecutively Strong Absorption from Gigahertz to Terahertz
Bands of a Monolithic Three-Dimensional Fe3O4/Graphene Material
Chen, HH (Chen, Honghui)[ 1 ] ; Huang, ZY (Huang, Zhiyu)[ 1 ] ; Huang, Y (Huang, Yi)[ 1 ] ; Zhang, Y (Zhang, Yi)[ 3 ] ; Ge, Z (Ge, Zhen)[ 1 ] ; Ma, WL (Ma, Wenle)[ 1 ] ; Zhang, TF (Zhang, Tengfei)[ 1 ] ; Wu, MM (Wu, Manman)[ 1 ] ; Xu, ST (Xu, Shitong)[ 2 ] ; Fan, F (Fan, Fei)[ 2 ] ; Chang, SJ (Chang, Shengjiang)[ 2 ] ; Chen, YS (Chen, Yongsheng)[ 1 ] ...
ACS APPLIED MATERIALS & INTERFACES, 2019, 11(1): 1274-1282
DOI: 10.1021/acsami.8b17654
Abstract
With the
booming microwave and terahertz technology for communication, detection, and
healthcare, the consequently increasingly complicated electromagnetic
environment is in urgent need of high-performance microwave and terahertz
absorption materials. However, it is still a huge challenge to achieve
consecutively strong absorption in both microwave and terahertz regimes.
Herein, an ultra-broadband and highly efficient absorber for both microwave and
terahertz bands based on the monolithic three-dimensional cross-linked
Fe3O4/graphene material (3DFG) is first reported. The 3DFG shows an incredible
wide qualified absorption bandwidth (with reflection loss less than -10 dB)
from 3.4 GHz to 2.5 THz, which is the best result in this area by far.
Furthermore, the remarkable absorption performance can be maintained under
oblique incidence, different compressive strains, and even after 200
compression/release cycles. The designed highly porous structure for minimizing
surface reflection combined with the micro-macro integrated high lossy
framework results in the excellent absorptivity, as verified by the terahertz
time-domain spectroscopy technique. With these, the 3DFG achieves an
unprecedentedly average absorption intensity of 38.0 dB, which is the maximum
value among the broadband absorbers. In addition, its specific average
microwave and terahertz absorption value is over 2 orders of magnitude higher
than other kinds of reported materials. The results provide new insights for
developing novel ultra-broadband absorbers with stronger reflection loss and
wider absorption bandwidth.
