Preparation of Hollow Porous Carbon Nanofibers and Their Performance and Mechanism of Broadband Microwave Absorption
Developing microwave absorbing composites with lightweight and wide absorption bands is an essential direction for electromagnetic wave stealth and shielding application. In this article, PAN/PMMA blend fibers and sheath-core blend fibers with PAN/PMMA as the sheath and PMMA as the core were spun by...
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MDPI AG
2022-10-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/20/7273 |
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| author | Rui Shao Fang Wang Shenglin Yang Junhong Jin Guang Li |
| author_facet | Rui Shao Fang Wang Shenglin Yang Junhong Jin Guang Li |
| author_sort | Rui Shao |
| collection | DOAJ |
| description | Developing microwave absorbing composites with lightweight and wide absorption bands is an essential direction for electromagnetic wave stealth and shielding application. In this article, PAN/PMMA blend fibers and sheath-core blend fibers with PAN/PMMA as the sheath and PMMA as the core were spun by uniaxial and coaxial electrostatic spinning, respectively. Porous carbon nanofiber (PCNF) and hollow porous carbon nanofiber (HPCNF) were obtained after pre-oxidation and carbonization of the corresponding two precursor fibers. The microwave absorption composite samples with PCNF and HPCNF as absorbents and paraffin as matrix were prepared, respectively. Their electromagnetic parameters were investigated by the reflective-transmission network parameter method. The microwave absorption properties of the corresponding composites were calculated based on a model for a single-layer planewave absorber from electromagnetic parameters. The results showed diversity between the microwave absorbing performance of the composites filled with PCNF and HPCNF. HPCNF performs better than PCNF as an absorbent; that is, the lowest reflection loss of composite filled with HPCNF is −20.26 dB and the effective bandwidth (lower than −10 dB) is to 4.56 GHz, while the lowest reflection loss of a composite filled with PCNF is −13.70 dB, and the effective bandwidth (lower than −10 dB) is 2.68 GHz when the absorbent content is 7%, and the thickness is 3 mm. Much lower reflection loss and a wider absorption band could be expected from HPCNF. The presence of a hollow structure in HPCNF, which may increase the degree of polarization and provide more interfaces for the interference phase extinction of reflected electromagnetic waves, might help to improve the attenuation of electromagnetic waves and broaden the absorption band. |
| first_indexed | 2024-03-09T19:52:51Z |
| format | Article |
| id | doaj.art-1dccf66dd1364429aa2cfecc6e1f7dca |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T19:52:51Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-1dccf66dd1364429aa2cfecc6e1f7dca2023-11-24T01:04:59ZengMDPI AGMaterials1996-19442022-10-011520727310.3390/ma15207273Preparation of Hollow Porous Carbon Nanofibers and Their Performance and Mechanism of Broadband Microwave AbsorptionRui Shao0Fang Wang1Shenglin Yang2Junhong Jin3Guang Li4College of Materials Science and Engineering, Donghua University, Shanghai 201620, ChinaSinopec Yizheng Chemical Fibre Company Limited, Yangzhou 225000, ChinaCollege of Materials Science and Engineering, Donghua University, Shanghai 201620, ChinaCollege of Materials Science and Engineering, Donghua University, Shanghai 201620, ChinaCollege of Materials Science and Engineering, Donghua University, Shanghai 201620, ChinaDeveloping microwave absorbing composites with lightweight and wide absorption bands is an essential direction for electromagnetic wave stealth and shielding application. In this article, PAN/PMMA blend fibers and sheath-core blend fibers with PAN/PMMA as the sheath and PMMA as the core were spun by uniaxial and coaxial electrostatic spinning, respectively. Porous carbon nanofiber (PCNF) and hollow porous carbon nanofiber (HPCNF) were obtained after pre-oxidation and carbonization of the corresponding two precursor fibers. The microwave absorption composite samples with PCNF and HPCNF as absorbents and paraffin as matrix were prepared, respectively. Their electromagnetic parameters were investigated by the reflective-transmission network parameter method. The microwave absorption properties of the corresponding composites were calculated based on a model for a single-layer planewave absorber from electromagnetic parameters. The results showed diversity between the microwave absorbing performance of the composites filled with PCNF and HPCNF. HPCNF performs better than PCNF as an absorbent; that is, the lowest reflection loss of composite filled with HPCNF is −20.26 dB and the effective bandwidth (lower than −10 dB) is to 4.56 GHz, while the lowest reflection loss of a composite filled with PCNF is −13.70 dB, and the effective bandwidth (lower than −10 dB) is 2.68 GHz when the absorbent content is 7%, and the thickness is 3 mm. Much lower reflection loss and a wider absorption band could be expected from HPCNF. The presence of a hollow structure in HPCNF, which may increase the degree of polarization and provide more interfaces for the interference phase extinction of reflected electromagnetic waves, might help to improve the attenuation of electromagnetic waves and broaden the absorption band.https://www.mdpi.com/1996-1944/15/20/7273hollow porous carbon nanofiber (HPCNF)compositemicrowave absorptionreflection loss |
| spellingShingle | Rui Shao Fang Wang Shenglin Yang Junhong Jin Guang Li Preparation of Hollow Porous Carbon Nanofibers and Their Performance and Mechanism of Broadband Microwave Absorption Materials hollow porous carbon nanofiber (HPCNF) composite microwave absorption reflection loss |
| title | Preparation of Hollow Porous Carbon Nanofibers and Their Performance and Mechanism of Broadband Microwave Absorption |
| title_full | Preparation of Hollow Porous Carbon Nanofibers and Their Performance and Mechanism of Broadband Microwave Absorption |
| title_fullStr | Preparation of Hollow Porous Carbon Nanofibers and Their Performance and Mechanism of Broadband Microwave Absorption |
| title_full_unstemmed | Preparation of Hollow Porous Carbon Nanofibers and Their Performance and Mechanism of Broadband Microwave Absorption |
| title_short | Preparation of Hollow Porous Carbon Nanofibers and Their Performance and Mechanism of Broadband Microwave Absorption |
| title_sort | preparation of hollow porous carbon nanofibers and their performance and mechanism of broadband microwave absorption |
| topic | hollow porous carbon nanofiber (HPCNF) composite microwave absorption reflection loss |
| url | https://www.mdpi.com/1996-1944/15/20/7273 |
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