膨胀石墨体积膨胀率对毫米波衰减性能的影响  

Effect of Expanding Volume of Exfoliated Graphite on Millimeter-wave Attenuation Performance

作　　者：赵纪金[1,2] 李晓霞[1,2] 郭宇翔[1] 杨莉[1,2] 

机构地区：[1]脉冲功率激光技术国家重点实验室,合肥230037 [2]电子工程学院红外与低温等离子体安徽省重点实验室,合肥230037

出　　处：《光子学报》2014年第3期58-61,共4页Acta Photonica Sinica

基　　金：脉动功率激光技术国家重点实验室基金(No.SKL20132R03)资助

摘　　要：膨胀石墨是一种具有潜在应用价值的红外/毫米波无源干扰一体化材料.本文依次以硝酸和磷酸、硝酸和乙酸的混酸为插层剂,高锰酸钾为氧化剂,采用分步插层法制备了不同体积膨胀率的膨胀石墨.采用扫描电镜分析了膨胀石墨微观结构随膨胀体积的变化;采用静态测试方法测试了不同体积膨胀率膨胀石墨的毫米波衰减性能.结果表明:随膨胀体积的增大,膨胀石墨层壁更薄,片层被充分打开,其有更多的微小薄片的尺度分布介于几微米到几十微米之间;膨胀石墨对毫米波的衰减性能随膨胀体积的增大而增大,当膨胀体积从233mL/g增大到450mL/g时,其3mm波衰减性能从5.7dB增大到8.68dB.Exfoliated graphite is a potential military passive interfering material, which can attenuate infrared and millimeter-wave simultaneously. Exfoliated graphites with different expanding volumes were prepared by two-step intercalation, in which the mixture of nitric acid and phosphoric acid, nitric acid and acetic acid were employed as intercalating agent, and potassium permanganate was used as oxidant. The microstructures of exfoliated graphites with different expanding volumes were analyzed by scanning electron microscope. The millimeter-wave attenuation performances of exfoliated graphites with different expanding volumes were measured by a static method. The results show that the exfoliated graphites＇ sheets become thinner with the increasing of expanding volume, the interlayers are fully opened and there are more tiny graphite flakes with size distribution between several microns and several ten microns. And the millimeter-wave attenuation performance enhances with the increasing of expanding volume. When the expanding volume increases from 233 mL/g to 450 mL/g, the 3 mm wave attenuation value rises from 5.7 dB to 8.68 dB.

关 键 词：膨胀石墨 膨胀体积 微观结构 毫米波 衰减性能 

分 类 号：TN97[电子电信—信号与信息处理]