摘要
在5%H_(2)+95%N2气氛下,还原Co Fe_(2)O_(4)纳米粒子制备了Co Fe_(2)O_(4)-Co_(3)Fe_(7)纳米粒子;以焙烧黄麻纤维得到的多孔碳纤维为碳源用水热法将Co Fe_(2)O_(4)纳米粒子负载到多孔碳中,制备出Co Fe_(2)O_(4)/多孔碳。使用X射线衍射仪、扫描电子显微镜、透射电子显微镜、拉曼光谱仪、同步热分析仪等手段对材料进行表征,并使用矢量网络分析仪测量了复合材料的电磁参数和微波吸收性能。结果表明,Co Fe_(2)O_(4)-Co_(3)Fe_(7)纳米粒子和Co Fe_(2)O_(4)/多孔碳的微波吸收性能明显优于Co Fe_(2)O_(4)纳米粒子。Co Fe_(2)O_(4)-Co_(3)Fe_(7)纳米粒子的有效频宽(反射损耗<-10 d B的频率宽度)可达4.8 GHz。Co Fe_(2)O_(4)/多孔碳的有效频宽可达6 GHz,覆盖了整个Ku波段(12~18 GHz)。这些材料优异的微波吸收性能,可归因于合适的介电常数、大的介电损耗、多孔结构以及介电损耗和磁损耗的协同作用。
Co Fe_(2)O_(4)-Co3Fe7nanoparticles were successfully prepared by reducing Co Fe_(2)O_(4)nanoparticles in 5%H_(2)+95%N2.Meanwhile,Co Fe_(2)O_(4)nanoparticles were successfully loaded onto the porous carbon by hydrothermal method with the porous carbon fiber calcined from jute fiber as precursor.The prepared two composites were characterized by X-ray diffractometer(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Raman spectrometer,and simultaneous thermal analyzer(STA).Their electromagnetic parameters and microwave absorption performances were measured by vector network analyzer(VNA).The results show that the microwave absorption performances of Co Fe_(2)O_(4)-Co3Fe7nanoparticles and Co Fe_(2)O_(4)/porous carbon are obviously better than that of the plain Co Fe_(2)O_(4)nanoparticles.The effective bandwidth(frequency width of reflection loss<-10 d B)of Co Fe_(2)O_(4)-Co3Fe7nanoparticles is 4.8 GHz,while that of Co Fe_(2)O_(4)/porous carbon can reach 6 GHz,covering the entire Ku band(12~18 GHz).The excellent microwave absorption performance can be attributed to the appropriate dielectric constant,large dielectric loss,porous structure,and the synergistic effect of dielectric loss and magnetic loss.Owing to the characteristics of low cost,low density and good microwave absorption performance,the Co Fe_(2)O_(4)/porous carbon has broad application prospect for Ku band as an economic,lightweight and broadband microwave absorbent.
作者
李万喜
杜意恩
郭芳
陈勇强
LI Wanxi;DU Yi'en;GUO Fang;CHEN Yongqiang(Department of Chemistry and Chemical Engineering,Jinzhong University,Jinzhong 030619,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2021年第4期302-312,共11页
Chinese Journal of Materials Research
基金
山西省高校科技创新项目(2019L0883)
山西省“1331工程”重点创新团队(PY201817)
晋中学院“1331工程”重点创新团队(jzxycxtd2019005)。
作者简介
李万喜,男,1986年生,副教授;通讯作者:李万喜,男,1986年生,副教授,liwanxi1986@163.com,研究方向为微波吸收材料。
