NiCo_(2)O_(4)/BPC复合材料的制备及吸波性能研究

Preparation of NiCo_(2)O_(4)/BPC composite and study on its properties in absorbing microwave

以紫菜为碳源、KOH活化法制备的生物质衍生多孔碳为基体,采用水热法及高温煅烧成功合成钴酸镍/生物质衍生多孔碳(NiCo_(2)O_(4)/BPC)复合材料。利用XRD、SEM对样品进行表征分析,并利用矢量网络分析仪(VNA)对其吸波性能进行测试。结果表明,NiCo_(2)O_(4)/BPC复合材料具有远远高于生物质多孔碳和钴酸镍材料的电磁波吸收性能。当匹配厚度为5.5 mm、频率为6.24 GHz时,样品的最小反射损耗值可以低至-43.20 dB,此时有效吸收带宽为3.3 GHz。该多孔结构的碳材料可有效改善纳米复合材料的阻抗匹配条件,提高材料的衰减能力,从而获得优异的微波吸收性能。

Taking biomass-derived porous carbon(BPC),made from porphyra via KOH activation method, as matrix, NiCo_(2)O_(4)/BPC composite materials are successfully synthesized through hydrothermal method and high temperature calcination.The microstructure, composition and microwave-absorbing properties of the samples are elucidated through XRD,SEM,and VNA.It is shown that the prepared NiCo_(2)O_(4)/BPC composites own much better electromagnetic wave absorption performance than BPC or nickel cobaltate alone.Especially, the optimal reflection loss of the samples can be as low as-43.20 dB with effective bandwidth of 3.3 GHz via adjusting the thickness to 5.5 mm and a frequency of 6.24 GHz.The carbon materials with porous structure can effectively improve the impedance matching condition and attenuation ability of the composite, leading to a high microwave absorption performance.