煅烧温度对Zn<sub>0.96</sub>Co<sub>0.04</sub>O纳米纤维吸波性能的影响

doi:10.11896/cldb.19070140

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Abstract Single-phase Zn_0.96Co_0.04O 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 Zn_0.96Co_0.04O are obtained after calcining at above 600 ℃. With the increase of calcination temperature, the morphology of Zn_0.96Co_0.04O 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 Zn_0.96Co_0.04O 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.

Key words： Zn_0.96Co_0.04O nanofibers electrospinning calcination temperature microwave absorption

Published: 14 July 2020

CLC number:

TB34

Fund:This work was financially supported by the Natural Science Foundation Youth Fund of Hebei Province (E2015506011).

About author:: Xinkun Wangreceived his B.S. degree in applied chemistry from China University of Petroluem in 2017. He is currently pursuing his master's degree at the Shijiazhuang Campus of Army Engineering University. His research has focused on nano functional material.
Fang Zhao,associate professor at the Shijiazhuang Campus of the Army Engineering University. She has served as a member of the National College Student Metallurgical Skills Competition Judging Committee and Supervisory Committee. The main research field is functional ceramic absorbing materials. As a key member of the project, she has participated in more than 10 scientific researches in the military including the National Natural Science Foundation of China and the Na-tural Science Foundation of Hebei Province. She has authorized 4 national and national defense invention patents and 5 utility model patents. She has published more than 20 papers in SCI and EI journals.

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Cite this article:

WANG Xinkun,ZHAO Fang,WANG Jianjiang. Effect of Calcination Temperature on Microwave Absorbing Properties of Zn_0.96Co_0.04O Nanofibers[J]. Materials Reports, 2020, 34(14): 14034-14038.

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http://www.mater-rep.com/EN/10.11896/cldb.19070140 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14034

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