软木衍生3D纳米多孔碳的可控转化与微波吸收性能

Controllable Transformation and Microwave Absorption Performance of Cork-Derived 3D Nanoporous Carbon

以软木为原料,通过无氧条件下的不同温度梯度热解栓皮栎软木,探究软木炭的微波吸收性能,并评估其在电磁波吸收应用方面的前景。结果表明:经过热解处理后,软木炭呈现出具有天然可吸收及反射电磁波的规则蜂窝结构。随着碳化温度的升高,软木的有机官能团逐渐简化,石墨化程度逐渐增加,电阻率逐渐降低,介电常数逐渐增加,从而引起软木炭吸波能力的提升。当碳化温度为800℃时,软木炭在8.92 GHz处具有最大吸收(-27.26 dB),频带宽为1.79 GHz,满足最佳的阻抗匹配及介电损耗,具备良好的吸波性能。

The aim of this study was to investigate the microwave absorption performance of cork charcoal obtained from Quercus suber under anaerobic conditions with different temperature gradients,and evaluate its potential for electromagnetic wave absorption applications.The experimental results revealed that the cork charcoal exhibited a regular honeycomb structure,which naturally absorbed and reflected electromagnetic waves.With increasing carbonization temperature,the organic functional groups in cork gradually simplified,the degree of graphitization increased,the electrical resistivity decreased,and the dielectric constant increased.These changes collectively contributed to the enhancement of microwave absorption capability of the cork charcoal.Particularly,at a carbonization temperature of 800℃,the cork charcoal demonstrated the maximum absorption of-27.26 dB at 8.92 GHz,with a bandwidth of 1.79 GHz,satisfying optimal impedance matching and dielectric loss,thus exhibiting excellent microwave absorption performance.Therefore,the cork charcoal holds great potential for applications in the field of microwave absorption.