随着科技与经济的高速发展,电磁污染问题日益凸显,对人类生产生活构成潜在威胁,研发薄型、轻质、宽频、强吸收的吸波材料成为研究热点。采用二(四氮唑乙酸根)合钴(Ⅱ)配位聚合物[Co(tza)2]n作为前驱体,通过高温煅烧工艺,在不同温度条件下制备出碳/钴复合材料,通过X射线衍射仪、拉曼光谱仪、扫描电子显微镜、X射线光电子能谱仪、振动样品磁强计、矢量网络分析仪等对复合材料的组分、电磁参数及吸波性能进行研究。结果表明,煅烧温度800℃时制备的碳/钴复合材料C800具有多孔网络结构,由网状基体与微米球组成,含晶态钴与碳组分,且钴的结晶度在800℃时最优。C800吸波性能最优,在厚度1.5mm、高频17.9GHz时,其最小反射损耗(RLmin)值达 -24.4dB,有效吸收带宽(EAB)为2.6GHz;在厚度4.5mm、低频5.0GHz时,其RLmin值为-20.6dB,EAB为1.9GHz(4.1~6.0GHz);厚度为2.0mm时,最宽EAB为4.4GHz。碳/钴复合材料C800在高频和低频都具有良好的吸波性能。
With the rapid development of technology and economy,the problem of electromagnetic pollution has become increasingly prominent,posing a potential threat to human production and life.The research and development of thin,light,wideband,and strongly absorptive microwave-absorbing materials has become a hot research topic.Using cobalt coordination polymer [Co(tza)2]n as the precursor,carbon/cobalt composite materials were prepared by high-temperature calcination at different temperatures.The composition,electromagnetic parameters,and absorbing performance of the materials were systematically studied by XRD,Raman spectroscopy,SEM,XPS,vibrating sample magnetometer,and vector network analyzer.The results showed that the carbon/cobalt composite material C800 prepared at 800℃ possessed a porous network structure composed of a network matrix and microspheres,containing crystalline Co and carbon components,and the crystallinity of Co was optimal at 800℃.C800 had the best microwave absorption performance.At a thickness of 1.5mm and a high frequency of 17.9GHz,its minimum reflection loss (RLmin) value reached -24.4dB,and the effective absorption bandwidth (EAB) was 2.6GHz.At a thickness of 4.5mm and a low frequency of 5.0GHz,its RLmin value was -20.6dB,and the EAB was 1.9GHz (4.1-6.0GHz).When the thickness was 2.0mm,the widest EAB reached 4.4GHz.The carbon/cobalt composite material C800 exhibited good microwave absorption performance at both high and low frequencies.
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基金资助
山西省基础研究计划青年科学研究项目(202203021222205,20230302122216);太原科技大学科研启动基金资助项目(20222113);来晋优秀博士科研启动基金资助项目(20232040);山西省基础研究计划联合资助项目(交控)(202303011222008)
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