丝瓜络基碳材料的电磁波吸收性能

Electromagnetic wave absorption performance of loofah-based carbon materials

为开发具有电磁损耗的新型纤维状电磁波吸收材料,采用天然丝瓜络作为碳质纤维的基材,通过原位杂化将Fe_(3)O_(4)负载到纤维的表面和内部孔隙中。借助扫描电子显微镜、X射线光电子能谱仪、磁滞回线和电磁参数分析等对材料的结构和性能进行表征。结果表明:丝瓜络基碳材料具有特殊的中空结构,生成的Fe_(3)O_(4)颗粒在纤维表面和内部孔隙中均匀分布,介电损耗、磁损耗和纤维结构间的协同作用增强了材料的电磁波损耗;当FeCl_(3)浓度为2 mol/L,处理温度为700℃时,在2~18 GHz范围内,厚度为3 mm的试样在9.97 GHz处的电磁波损耗达到了-24.37 dB,在7.33~10.33 GHz频段内电磁波损耗小于-10 dB。丝瓜纤维通过合适的炭化及磁性颗粒负载工艺,可制备出性能优异的电磁波吸收材料。

In order to develop a novel fibrous electromagnetic wave absorbing material,natural loofah was used as the base material of a carbon mesh,with Fe_(3)O_(4) loaded onto the surface and internal pores of the loofah fiber through in-situ hybridization.The material properties were characterized and analyzed by scanning electron microscope,X-ray photoelectron spectrometer,vibrating sample magnetometer hysteresis loop analysis and electromagnetic parameter analysis.Results show that loofah-based carbon material preserves the special hollow structure,Fe_(3)O_(4) particles are uniformly distributed on the fiber surface and internal pores,and the synergy between dielectric loss,magnetic loss and fiber structure enhances the electromagnetic wave loss of the material.When the solubility of FeCl_(3) is 2 mol/L and the processing temperature is 700℃,in the range of 2-18 GHz,and the sample has a thickness of 3 mm,the electromagnetic wave loss reaches-24.37 dB at 9.97 GHz,and at 7.33-10.33 GHz the electromagnetic wave loss in the frequency band is less than-10 dB.The loofah fiber can be prepared into electromagnetic wave absorbing material with excellent performance through suitable carbonization and Fe_(3)O_(4) loading process.