多孔螺旋碳纤维低成本制备和增强吸波性能研究

Low-cost Preparation and Enhanced Microwave Absorption Properties of Porous Spiral Carbon Fibers

研究报告了一种受生物启发的螺旋碳纤维低成本、无催化剂的制备方法,即以茶叶体内天然螺纹导管结构为模板,通过高温碳化获得螺旋碳纤维(SCFs)材料。并且通过KOH活化造孔,获得了具有高比表面积(1923.56 m^(2)/g)和高孔容(1.06 cm^(3)/g)的多孔活性螺旋碳纤维(ASCFs)材料。微波吸收测试结果显示活化后的PASCFs材料具备更高的介电损耗和良好的阻抗匹配性,体现出优异的微波吸收性能。在材料含量为10 wt%,匹配厚度为3.53 mm时,ASCFs在电磁频率7.3 GHz下的反射损耗(RL)高达-38.18 dB,比活化前SCFs的最大反射损耗(RL)提高了近13倍。

This paper reports a bio-inspired,low-cost,and catalyst-free method for preparing spiral carbon fibers(SCFs)by the high-temperature carbonization and using the natural spiral vessel structure as the template.The porous active spiral carbon fibers(PASCFs)with a high specific surface area(1923.56 m^(2)/g)and high pore volume(1.06 cm^(3)/g)were further obtained by KOH activation.Microwave absorption test results show that the activated PASCFS material has a higher dielectric loss and good impedance matching than SCFs,and presents an excellent microwave absorption performance.When the load of PASCFs was 10 wt%,the reflection loss(RL)of ASCFs was up to 38.18 dB at 7.3 GHz and 3.53 mm thickness,which is nearly 13 times higher than the maximum reflection loss(RL)of SCFs.