C/ZnO复合材料的制备及电磁波吸收性能研究

Preparation and Electromagnetic Absorption Properties of C/ZnO Composites

以ZnAc_(2)·2H_(2)O、C_(6)H_(12)O_(6)和NaOH为原料,HMT为模板剂,采用一步水热法制备C/ZnO复合材料。通过X射线衍射仪、拉曼光谱仪、扫描电子显微镜和矢量网络分析仪分别对样品的物相、分子结构、微观形貌以及电磁波吸收性能进行测试。结果表明:ZnO纳米棒黏附在碳球表面和空隙,相互交织连接形成了C/ZnO复合材料。由于较强的介电损耗、多重界面极化和良好的阻抗匹配等优点,C/ZnO复合材料表现出优异的电磁波吸收性能。当ZnO的质量百分数为61.15%,厚度为1.9 mm时,C/ZnO复合材料在9.64 GHz处,最佳反射损耗(RL)值可达-41.97 dB,有效吸收频宽为4.56 GHz(7.08~12.64 GHz)。

C/ZnO composites are prepared by one-step hydrothermal method using ZnAc_(2)·2H_(2)O、C_(6)H_(12)O_(6) and NaOH as the raw materials and HMT as the template.The phase,molecular structure,morphology and electromagnetic wave absorption properties of the samples are tested by X-ray diffractometer,raman spectrometer,scanning electron microscope and vector network analyzer respectively.Experimental results reveal that C/ZnO composites are formed by interlacing ZnO nanorods on the surface and void of carbon spheres.Due to the strong dielectric loss,multiple interfacial polarization and good impedance matching,C/ZnO composites exhibit an excellent electromagnetic wave absorption properties.When the mass percentage of ZnO is 61.15%and the thickness is 1.9 mm,the optimal reflection loss(RL)of C/ZnO composites can reach-41.97 dB at 9.64 GHz,and the effective absorption bandwidth is 4.56 GHz(7.08~12.64GHz).