Lightweight and robust rGO/sugarcane derived hybrid carbon foams with outstanding EMI shielding performance
writer：Lei Wang#, Xuetao Shi#, Junliang Zhang, Yali Zhang and Junwei Gu*
keywords：EMI
source：期刊
Issue time：2020年
Increasingly severe electromagnetic pollution is now in urgent need of materials with lightweight, excellent
flame retardancy, and outstanding electromagnetic interference shielding effectiveness (EMI SE).
Renewable source-derived carbon foams and graphene have attracted extensive attention due to their
3D porous structure and remarkable electrical conductivity (). In this work, annealed sugarcane (ASC)
was prepared by removal of lignin from sugarcane via hydrothermal reaction, followed by annealing
treatment. Then graphene oxide (GO) was filled by vacuum-assisted impregnation process and thermally
annealed to obtain the ASC/reduced graphene oxide (rGO) hybrid foams. When the loading of rGO
is 17 wt.%, the ASC/rGO hybrid foam (density, of 0.047 g/cm3) exhibits the optimal of 6.0 S/cm, EMI
SE of 53 dB, specific SE (SSE = SE/)/thickness (t) of 3830 dB·cm2/g, and compressive strength of 1.33
MPa, which is 76%, 36%, 13% and 6% higher than those of ASC, respectively. Moreover, ASC/rGO presents
excellent flame retardancy, thermal stability, and heat insulation, which remains constant under burning
on an alcohol lamp and presents low thermal conductivity of 115.19 mW(m·K), close to the requirement
for heat insulation. Synergistic effect of ASC and rGO not only significantly increase of ASC/rGO, but
fully utilizes the capability of ASC and rGO to attenuate electromagnetic waves by virtue of unique porous
structures and abundant interfaces. Such kind of lightweight EMI materials with excellent mechanical
property, shielding performance, flame retardancy, and heat insulation is expected to tackle the key scientific
and technical bottleneck problems of EMI materials, and will greatly expand the application of
carbon nanomaterials in the field of aerospace industry.