碳纳米管/氮化硅纳米复合材料的制备及吸波性能研究

Study on Preparation and Microwave Absorption Properties of Carbon Nanotubes/Silicon Nitride Nanocomposites

通过对纳米Si_(3)N_(4)表面改性和对MWCNTs表面的酸化处理,使用溶剂热法制备出Si_(3)N_(4)/MWCNTs纳米复合材料。通过SEM、XRD、FT-IR等研究了复合材料的结构以及形貌,并用矢量网络分析仪测量其电磁参数。结果表明:制备的纳米复合材料在样品厚度为1.5 mm有效吸频带的宽度最宽,可以达到5.38 GHz。在样品厚度为4.0 mm时,在4.24 GHz处反射损耗RL值可以达到-41.73 dB,有效带宽为1.81 GHz。

Through surface modification of nano-Si_(3)N_(4) and surface acidification treatment of MWCNTs,Si_(3)N_(4)/MWCNTs nanocomposites are prepared by solvothermal method.The structure and morphology of the composites are studied by SEM,XRD and FT-IR,and their electromagnetic parameters are measured by vector network analyzer.The results show that the effective band width of the prepared nano-composite is the widest when the sample thickness is 1.5 mm,which can reach 5.38 GHz.When the sample thickness is 4.0 mm,the RL value of reflection loss at 4.24 GHz can reach-41.73 dB,and the effective bandwidth is 1.81 GHz.