Flexible and Thermostable Graphene/SiC Nanowire Foam Composites with Tunable Electromagnetic Wave Absorption Properties.
Three-dimensional (3D) flexible foams consisting of reduced graphene oxides (rGO) and in situ grown SiC nanowires (NWs) were prepared using freeze-drying and carbothermal reduction processes. By means of incorporating SiC nanowires into rGO foams, both the thermostability and electromagnetic absorption of the composites were improved. It was demonstrated that rGO/SiC NW foams were thermostable beyond ∼630 °C (90% weight retention in air atmosphere). As expected, rGO/SiC NW foams in the poly(dimethylsiloxane) matrix achieved effective absorption in the entire X-band (8.2-12.4 GHz) with a thinner thickness (3 mm) in comparison with those of the pure rGO foams. It is revealed that SiC nanowires with abundant stacking faults, twinning interfaces, and bridged junctions play an important role in the enhanced electromagnetic absorption performance, in addition to the contribution of interconnected graphene networks. Hierarchical rGO/SiC NW foams not only are efficient absorbers in the critical environments but also can be applied in photocatalytic and thermal-management fields.
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an 710072, China.
Meikang
M
Han
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an 710072, China.
Xiaowei
http://orcid.org/0000-0001-8756-8624
X
Yin
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an 710072, China.
Zexin
Z
Hou
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an 710072, China.
Changqing
C
Song
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an 710072, China.
Xinliang
X
Li
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an 710072, China.
Litong
L
Zhang
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an 710072, China.
Laifei
L
Cheng
SiC; electromagnetic absorption; flexible; graphene; thermostable