Defect- and Interface-Induced Dielectric Loss in ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C Electromagnetic Wave Absorber
Controlling defects and interfaces in composite absorbers can effectively regulate electromagnetic (EM) parameters and enhance the electromagnetic wave (EMW) absorption ability, but the mechanism still needs to be further elucidated. In this study, ZnFe<sub>2</sub>O<sub>4</sub&g...
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MDPI AG
2022-08-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/16/2871 |
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| author | Hao Shen Zhen Wang Chun Wang Pengfei Zou Zhaoyang Hou Chunlong Xu Hongjing Wu |
| author_facet | Hao Shen Zhen Wang Chun Wang Pengfei Zou Zhaoyang Hou Chunlong Xu Hongjing Wu |
| author_sort | Hao Shen |
| collection | DOAJ |
| description | Controlling defects and interfaces in composite absorbers can effectively regulate electromagnetic (EM) parameters and enhance the electromagnetic wave (EMW) absorption ability, but the mechanism still needs to be further elucidated. In this study, ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C composite was synthesized via the hydrothermal method followed by post-annealing in different atmospheres. Defects and interfaces were characterized by Raman, PL spectroscopy, XPS and TEM, and their relationship with dielectric loss and EMW absorption performance was discussed in detail. Results show that the N<sub>2</sub>-annealed ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C composite with abundant defects and interfaces as well as an optimized composition exhibits excellent EMW dissipation ability, with a <i>RL<sub>min</sub></i> value of −17.4 dB and an <i>f<sub>e</sub></i> of 3.85 GHz at a thickness of 2.28 mm. The excellent EMW absorption performance originates from suitable impedance matching, significant conduction loss and strong dielectric loss (interfacial polarization, diploe polarization and defect polarization) dominated by lattice defects and interfaces. This study provides a view into the relationship between defects, interfaces, EM parameters and EMW absorption ability, and also suggests an effective way to promote EMW dissipation ability of the absorbers by controlling defects and interfaces. |
| first_indexed | 2024-03-09T04:02:04Z |
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| id | doaj.art-fe79c4ecaff44da89fe96cc4629767df |
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| language | English |
| last_indexed | 2024-03-09T04:02:04Z |
| publishDate | 2022-08-01 |
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| spelling | doaj.art-fe79c4ecaff44da89fe96cc4629767df2023-12-03T14:13:30ZengMDPI AGNanomaterials2079-49912022-08-011216287110.3390/nano12162871Defect- and Interface-Induced Dielectric Loss in ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C Electromagnetic Wave AbsorberHao Shen0Zhen Wang1Chun Wang2Pengfei Zou3Zhaoyang Hou4Chunlong Xu5Hongjing Wu6Department of Applied Physics, School of Science, Chang’an University, Xi’an 710064, ChinaDepartment of Applied Physics, School of Science, Chang’an University, Xi’an 710064, ChinaSchool of Science, Xi’an Shiyou University, Xi’an 710064, ChinaDepartment of Applied Physics, School of Science, Chang’an University, Xi’an 710064, ChinaDepartment of Applied Physics, School of Science, Chang’an University, Xi’an 710064, ChinaDepartment of Applied Physics, School of Science, Chang’an University, Xi’an 710064, ChinaMOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710072, ChinaControlling defects and interfaces in composite absorbers can effectively regulate electromagnetic (EM) parameters and enhance the electromagnetic wave (EMW) absorption ability, but the mechanism still needs to be further elucidated. In this study, ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C composite was synthesized via the hydrothermal method followed by post-annealing in different atmospheres. Defects and interfaces were characterized by Raman, PL spectroscopy, XPS and TEM, and their relationship with dielectric loss and EMW absorption performance was discussed in detail. Results show that the N<sub>2</sub>-annealed ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C composite with abundant defects and interfaces as well as an optimized composition exhibits excellent EMW dissipation ability, with a <i>RL<sub>min</sub></i> value of −17.4 dB and an <i>f<sub>e</sub></i> of 3.85 GHz at a thickness of 2.28 mm. The excellent EMW absorption performance originates from suitable impedance matching, significant conduction loss and strong dielectric loss (interfacial polarization, diploe polarization and defect polarization) dominated by lattice defects and interfaces. This study provides a view into the relationship between defects, interfaces, EM parameters and EMW absorption ability, and also suggests an effective way to promote EMW dissipation ability of the absorbers by controlling defects and interfaces.https://www.mdpi.com/2079-4991/12/16/2871ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/Cdefects and interfacesdielectric losselectromagnetic wave absorption |
| spellingShingle | Hao Shen Zhen Wang Chun Wang Pengfei Zou Zhaoyang Hou Chunlong Xu Hongjing Wu Defect- and Interface-Induced Dielectric Loss in ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C Electromagnetic Wave Absorber Nanomaterials ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C defects and interfaces dielectric loss electromagnetic wave absorption |
| title | Defect- and Interface-Induced Dielectric Loss in ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C Electromagnetic Wave Absorber |
| title_full | Defect- and Interface-Induced Dielectric Loss in ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C Electromagnetic Wave Absorber |
| title_fullStr | Defect- and Interface-Induced Dielectric Loss in ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C Electromagnetic Wave Absorber |
| title_full_unstemmed | Defect- and Interface-Induced Dielectric Loss in ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C Electromagnetic Wave Absorber |
| title_short | Defect- and Interface-Induced Dielectric Loss in ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C Electromagnetic Wave Absorber |
| title_sort | defect and interface induced dielectric loss in znfe sub 2 sub o sub 4 sub zno c electromagnetic wave absorber |
| topic | ZnFe<sub>2</sub>O<sub>4</sub>/ZnO/C defects and interfaces dielectric loss electromagnetic wave absorption |
| url | https://www.mdpi.com/2079-4991/12/16/2871 |
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