Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 586, Issue -, Pages 479-490Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.10.111
Keywords
ZnO/ZnCo2O4 composites; Heterojunction surface; Dielectric and magnetic loss; Electromagnetic wave absorption
Categories
Funding
- Natural Science Foundation of Shandong Province [ZR2019YQ24]
- Qingchuang Talents Induction Program of Shandong Higher Education Institution (Research and Innovation Team of Structural-Functional Polymer Composites)
- National Natural Science Foundation of China [51407134, 51603108, 51801001]
- China Postdoctoral Science Foundation [2016M590619, 2016M601878]
- Provincial Key Research and Development Program of Shaanxi [2019GY-197]
- Thousand Talents Plan
- World-Class University and Disci-pline
- The Taishan Scholar's Advantageous and Distinctive Discipline Program of Shandong Province
- World-Class Discipline Program of Shandong Province
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This study improved the electromagnetic wave absorption performance by preparing ZnO hollow spheres and ZnO/ZnCo2O4 composites, and found that the addition of ZnO hollow spheres significantly influenced the properties of the absorbing material. The ZnO/ZnCo2O4 composites showed the best absorption performance when adding 5 mg of ZnO hollow spheres.
Reasonable structure and composition are essential for electromagnetic wave absorption (EMW). Herein, ZnO hollow spheres were prepared with carbon spheres as templates and then synthesized ZnO/ZnCo2O4 composites by the solvothermal method and annealing treatment. The flower-like ZnCo2O4 material was produced by self-assembly of ZnCo2O4 nanosheets. The absorbing material with the complex structure has multiple scattering and reflection, conduction loss, resonance, and eddy current loss characteristics. Furthermore, the addition of ZnO hollow spheres has a significant impact on electromagnetic parameters and absorption properties. As a result, the addition of ZnO hollow spheres can greatly enhance the complex permittivity of the ZnO/ZnCo2O4 composites and obtain excellent EMW absorbing properties. It is worth noting that ZnO/ZnCo2O4 composites show the best EMW absorption properties when the ZnO hollow spheres were added up to 5 mg. The minimum reflection loss is-55.42 dB and a matching thickness of 1.99 mm while the maximum effective absorption bandwidth can also reach 7.44 GHz with a matching thickness of 2.4 mm. Our research can prove that the structure and composition have a significant influence on the properties of the absorbing material, which provides ideas for the development of absorbing materials with high-performance. (C) 2020 Elsevier Inc. All rights reserved.
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