石墨烯
介电常数
材料科学
退火(玻璃)
衰减
氧化物
电磁屏蔽
纳米材料
电磁干扰
电磁辐射
复合材料
光电子学
电介质
纳米技术
光学
电子工程
冶金
物理
工程类
作者
Fan Wu,Qiao Zeng,Xiaodong Yu,Mengxiao Sun,Aming Xie
摘要
Reduced graphene oxide (RGO) has been prepared through the thermal reduction method with different annealing temperatures to explore the effects of temperature on the permittivity and electromagnetic attenuation performance. The real and imaginary parts of permittivity increase along with the decrease in the oxygen functional group and the increase in the filler loading ratio. A composite only loaded with 1 wt. % of RGO can possess an effective electromagnetic absorption bandwidth of 7.60 GHz, when graphene oxide was reduced under 300 °C for 2 h. With the annealing temperature increased to 700 °C and the well reduced RGO loaded 7 wt. % in the composite, the electromagnetic interference shielding efficiency can get higher than 35 dB from 2 to 18 GHz. This study shows that controlling the oxygen functional groups on the RGO surface can also obtain an ideal electromagnetic attenuation performance without any other decorated nanomaterials.
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