煅烧温度对Zn0.96Co0.04 O纳米纤维吸波性能的影响  

Effect of Calcination Temperature on Microwave Absorbing Properties of Zn0.96Co0.04O Nanofibers

作　　者：汪心坤 赵芳 王建江 WANG Xinkun;ZHAO Fang;WANG Jianjiang(Shijiazhuang Campus of Army Engineering University,Shijiazhuang 050003,China)

机构地区：[1]陆军工程大学石家庄校区,石家庄050003

出　　处：《材料导报》2020年第14期14034-14038,共5页Materials Reports

基　　金：河北省自然科学基金青年科学基金(E2015506011)。

摘　　要：以醋酸锌、硝酸钴和聚乙烯吡咯烷酮为主要原料,采用溶胶-凝胶法结合静电纺丝技术制备了Zn0.96Co0.04O纳米纤维。利用热重-差热分析仪、X射线衍射仪、场发射扫描电子显微镜和矢量网络分析仪研究了前驱体纤维的热分解过程以及煅烧温度对样品晶体结构、微观形貌和微波吸收性能的影响。结果表明,复合纤维经600℃及以上温度煅烧后,均生成单一六方纤锌矿型Zn0.96Co0.04O。随着煅烧温度的升高,Zn0.96Co0.04 O纤维的形貌由三维网状向“竹节”状转变,并最终失去纤维形态,呈现出不规则的纳米颗粒形态;与此同时,目标纳米纤维的最大吸收峰向高频移动。当煅烧温度为600℃时,制备的Zn0.96Co0.04O表现出最佳的电磁特性,具有优异的微波吸收性能。样品的最低反射率为-18.18 dB,有效吸收带宽为2.5 GHz(7.5~10 GHz)。Single-phase Zn0.96Co0.04O nanofibers were successfully fabricated via sol-gel method in combination with electrospinning technique using zinc acetate,cobalt nitrate and polyvinylpyrrolidone as principal raw materials.The thermal decomposition process of as-spun precursor nanofibers and the influences of calcination temperature on the crystal structure,micromorphology and microwave-absorbing properties of the prepared nanofiber samples were investigated by means of thermogravimetric and differential thermal analysis,X-ray diffraction,field emission scanning electron microscopy and vector network analyzer.The result shows that single hexagonal wurtzite Zn0.96Co0.04O are obtained after calcining at above 600℃.With the increase of calcination temperature,the morphology of Zn0.96Co0.04O fiber changed from three-dimensional network to bamboo-like structure,and eventually lost the fiber morphology and presents the irregular.At the same time,the maximum absorption peak of nanofibers moves toward a high frequency.The Zn0.96Co0.04O exhibits best electromagnetic properties at the calcination temperature 600℃,and the as-prepared samples possess excellent microwave absorption performance.The qualified absorption bandwidth reaches 2.5 GHz(7.5—10 GHz),and the minimum reflectivity reaches-18.18 dB.

关 键 词：Zn0.96Co0.04O纳米纤维 静电纺丝 煅烧温度 微波吸收 

分 类 号：TB34[一般工业技术—材料科学与工程]