引发剂用量对氧化石墨烯吸波性能研究

Study on Microwave Absorbing Property of Graphene Oxide with the Amount of Evocating Agent ( K_2S_2O_4)

以天然鳞片石墨为原料,改进Hummers法制备氧化石墨烯(GO)。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(FTIR)、拉曼光谱(Raman)和矢量网络分析仪(VNA)研究了引发剂(过硫酸钾)的用量对GO形貌、结构、氧化程度、电磁损耗特性、德拜弛豫模型及吸波性能的影响。结果表明:过硫酸钾添加量为10 g,含氧官能团的含量增加,层状结构产生缺陷,层间距为0.90 nm,介电常数和磁导率均较高,在14~18 GHz之间损耗因子达到最大值,为1.07。在17.83 GHz时,反射率达到-34.28 dB,吸波性能最优异。

Graphene oxide was prepared by Hummers methods using natural flake graphite. The structure,morphology, degree of oxidation, electromagnetic loss properties, Debye relaxation and microwave absorbing properties of graphene oxide（ GO） were investigated by X-ray diffraction（ XRD）,Raman spectrometer,scanning electron microscope（ SEM）,infrared spectrometer（ FTIR） and Vector network analyzer（ VNA）. The results shows that the amount of evocating agent（ potassium peroxydisulfate） is 10 g. Increasing the content of oxygen-functional groups and layered structural defects,the layer spacing is 0. 90 nm. The permittivity and permeability are higher,when the loss factor is between 14-18 GHz. The maximum value is 1. 07. At 17. 83 GHz,the reflectivity is -34. 28 dB. It has the best microwave absorbing properties.