Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents
Modern electronic information technology has led social life into inevitable electromagnetic pollution, making microwave absorbing materials more and more important. Herein, dielectric-conductive ZnO/C hybrid composite absorbents were prepared by two-step carbonization with ZnO powders and glucose a...
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| Format: | Article |
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MDPI AG
2023-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/7/1220 |
| _version_ | 1797588260629774336 |
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| author | Junxiao Yan Hongyao Jia Liang Zhou Zhenjun Wang Hongbo Wang |
| author_facet | Junxiao Yan Hongyao Jia Liang Zhou Zhenjun Wang Hongbo Wang |
| author_sort | Junxiao Yan |
| collection | DOAJ |
| description | Modern electronic information technology has led social life into inevitable electromagnetic pollution, making microwave absorbing materials more and more important. Herein, dielectric-conductive ZnO/C hybrid composite absorbents were prepared by two-step carbonization with ZnO powders and glucose as critical materials. The electrical conductivity, complex permittivity, and reflection loss were analyzed to study the dielectric and microwave absorption properties. Results show that the prepared ZnO/C composite absorbents exist in the form of rod-like ZnO dispersed in the irregular block carbon, and the complex permittivity of the composite absorbents can be adjusted via varying the carbonization temperature. The minimum reflection loss of −25.64 dB is achieved at 1.8 mm thickness for the composite absorbent with 50 wt.% absorbent content as the final carbonization temperature is 750 °C, and the optimum effective absorption bandwidth is 2.21 GHz at 9.64–11.85 GHz. The excellent microwave absorption properties of ZnO/C composite absorbents are attributed to the combination actions of dipole polarization, conductance loss, and interface polarization, which is significant for the purposeful design of superior microwave-absorbing materials with dielectric and conductive absorbents. |
| first_indexed | 2024-03-11T00:49:38Z |
| format | Article |
| id | doaj.art-30b0dce0a5a5456baeb8c9bd7ba1c9dd |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T00:49:38Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-30b0dce0a5a5456baeb8c9bd7ba1c9dd2023-11-18T20:29:37ZengMDPI AGMetals2075-47012023-07-01137122010.3390/met13071220Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite AbsorbentsJunxiao Yan0Hongyao Jia1Liang Zhou2Zhenjun Wang3Hongbo Wang4School of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaModern electronic information technology has led social life into inevitable electromagnetic pollution, making microwave absorbing materials more and more important. Herein, dielectric-conductive ZnO/C hybrid composite absorbents were prepared by two-step carbonization with ZnO powders and glucose as critical materials. The electrical conductivity, complex permittivity, and reflection loss were analyzed to study the dielectric and microwave absorption properties. Results show that the prepared ZnO/C composite absorbents exist in the form of rod-like ZnO dispersed in the irregular block carbon, and the complex permittivity of the composite absorbents can be adjusted via varying the carbonization temperature. The minimum reflection loss of −25.64 dB is achieved at 1.8 mm thickness for the composite absorbent with 50 wt.% absorbent content as the final carbonization temperature is 750 °C, and the optimum effective absorption bandwidth is 2.21 GHz at 9.64–11.85 GHz. The excellent microwave absorption properties of ZnO/C composite absorbents are attributed to the combination actions of dipole polarization, conductance loss, and interface polarization, which is significant for the purposeful design of superior microwave-absorbing materials with dielectric and conductive absorbents.https://www.mdpi.com/2075-4701/13/7/1220carbonizationcomplex permittivitydielectric-conductive couplingmicrowave absorptionZnO/C absorbents |
| spellingShingle | Junxiao Yan Hongyao Jia Liang Zhou Zhenjun Wang Hongbo Wang Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents Metals carbonization complex permittivity dielectric-conductive coupling microwave absorption ZnO/C absorbents |
| title | Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents |
| title_full | Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents |
| title_fullStr | Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents |
| title_full_unstemmed | Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents |
| title_short | Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents |
| title_sort | tunable complex permittivity and strong microwave absorption properties of novel dielectric conductive zno c hybrid composite absorbents |
| topic | carbonization complex permittivity dielectric-conductive coupling microwave absorption ZnO/C absorbents |
| url | https://www.mdpi.com/2075-4701/13/7/1220 |
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