核壳结构C/TiO_2复合材料的制备与微波吸收性能研究  

Preparation and microwave absorption performances of C/TiO_2 composites with core/shell structure

作　　者：王宇 薛行健 曹瀚 沈国柱 WANG Yu;XUE Xingjian;CAO Han;SHEN Guozhu(School of Physics and Optoelectronic Engineering,Nanjing University of Information Science & Technology,Nanjing 210044)

机构地区：[1]南京信息工程大学物理与光电工程学院,南京210044

出　　处：《南京信息工程大学学报（自然科学版）》2019年第2期226-233,共8页Journal of Nanjing University of Information Science & Technology（Natural Science Edition）

基　　金：南京信息工程大学大学生实践创新训练计划(201710300285);近地面探测与感知技术重点实验室开放项目(TCGZ2017A011)

摘　　要：以葡萄糖为碳源,用水热法成功制备了碳微球,再以Ti(SO_4)_2为钛源,制备了核壳结构的C/TiO_2复合微球.为提高材料介电损耗,将样品在N_2氛围中不同温度条件下进行了碳化.采用X射线衍射仪、扫描电子显微镜和透射电子显微镜对样品的结构和形貌进行了表征,用矢量网络分析仪测试了样品在2～18 GHz范围的复介电常数,并计算其反射损耗.结果表明:碳微球具有较高的微波介电损耗;碳微球与TiO_2复合后,在相同层厚条件下,反射损耗峰向低频迁移;700℃和800℃碳化下的C和C/TiO_2复合材料具有优良的微波吸收性能,其中C-700复合材料最小反射损耗达到-41.2 dB,低于-10 dB的最大吸收带宽达到4.5 GHz,C/Ti-700复合材料的最小反射损耗为-30.0 dB,最大吸收带宽达4.2 GHz.Carbon microspheres and C/TiO2 microspheres with core/shell structure were successfully synthesized by hydrothermal method using glucose and Ti(SO4)2 as carbon source and titanium source,respectively.To improve the dielectric loss of these materials,the synthesized samples were carbonized at different temperatures under N2 atmosphere.The structures and morphologies of the samples were characterized by X-ray diffraction,scanning electron microscopy and transmission electron microscopy.The relative complex permittivity of the composites was measured by a vector network analyzer in the frequency range of 2-18 GHz and their reflection losses were calculated.The results show that the carbon microspheres have high microwave dielectric loss.After the carbon microspheres were composited with TiO2,the absorption peak migrated to low frequency under the same thickness.Particularly,the carbon and C/TiO2 composites carbonized at 700℃and 800℃display excellent microwave absorption performances.The minimum reflection loss value arrives at-41.2 dB and-30.0 dB and the maximum band width less than-10 dB is 4.5 GHz and 4.2 GHz for C-700 and C/Ti-700 composites,respectively.

关 键 词：碳球 C/TiO2复合物 复介电常数 复磁导率 反射损耗 

分 类 号：TB383.1[一般工业技术—材料科学与工程]