Electromagnetic wave absorbing characteristics of C/Co-Mn and C/Co-Zn doped barium hexaferrite sandwiched nanocomposites
The development of high reflection loss and broad frequency bandwidth for microwave absorbing materials (MAMs) has been intensified in recent years. Carbon nanocomposites have stimulated attention as the EM-wave absorbing materials due to their high conductivity with high dissipating capability of e...
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| Format: | Article |
| Language: | English English |
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Inderscience Enterprises Ltd.
2021
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| Online Access: | http://umpir.ump.edu.my/id/eprint/33193/ http://umpir.ump.edu.my/id/eprint/33193/1/IJNT%2017%2811-12%29%20Paper%2002.pdf http://umpir.ump.edu.my/id/eprint/33193/7/Electromagnetic%20wave%20absorbing%20characteristics%20.pdf |
| _version_ | 1848824197837488128 |
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| author | Rodziah, Nazlan Ismayadi, Ismail Idza Riati, Ibrahim Fadzidah, Mohd Idris Mohamad Ashry, Jusoh Khamirul Amin, Matori |
| author_facet | Rodziah, Nazlan Ismayadi, Ismail Idza Riati, Ibrahim Fadzidah, Mohd Idris Mohamad Ashry, Jusoh Khamirul Amin, Matori |
| author_sort | Rodziah, Nazlan |
| building | UMP Institutional Repository |
| collection | Online Access |
| description | The development of high reflection loss and broad frequency bandwidth for microwave absorbing materials (MAMs) has been intensified in recent years. Carbon nanocomposites have stimulated attention as the EM-wave absorbing materials due to their high conductivity with high dissipating capability of electrostatic charges and EM-wave radiation shielding. In this study, we report on the analysis of microwave absorption through absorption spectrum of carbon/barium hexaferrite nanocomposites with Co-Mn and Co-Zn as dopants. The nanoparticles of Co-Mn-doped and Co-Zn-doped barium hexaferrites were synthesised using the mechanical alloying technique. The resultant particles were then mixed thoroughly with epoxy resin with ratio of 8:92 wt.% prior to sandwich with carbon black layer at different thicknesses of 1, 2 and 3 mm to form nanocomposites. The samples were characterised on their morphological, magnetic and microwave properties using field emission scanning electron microscope (FESEM), vibrating sample magnetometer (VSM) and vector network analyser (VNA) respectively; there follow rational discussions on the effect of dopant substitutions and microstructure on the absorption/reflection loss and bandwidth broadening of MAM. The results show that the saturation magnetisation of BaCoZnFe16O27 is higher as compared to that of BaCoMnFe16O27 and pure BaFe12O19 in which Zn behaves as an ion modifier that compensates the magnetic moment in hexaferrite sublattices, thus translated into an increase of net magnetic moment per unit volume of the sample. By using carbon black as a matching layer and BaCoMnFe16O27 as an absorbing layer with total sandwich thickness of 2 mm, the highest reflection loss of 39.83 dB was obtained. The capability to tune the absorption and bandwidth of all the samples at various frequencies indicates that these materials would be a superior MAM. Through scrutinisation of relationship between absorption/reflection loss with different dopants and thickness variation, further discussion on mechanism of adsorption/reflection characteristics for research optimisation would be provided. |
| first_indexed | 2025-11-15T03:09:12Z |
| format | Article |
| id | ump-33193 |
| institution | Universiti Malaysia Pahang |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T03:09:12Z |
| publishDate | 2021 |
| publisher | Inderscience Enterprises Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | ump-331932022-07-07T04:44:11Z http://umpir.ump.edu.my/id/eprint/33193/ Electromagnetic wave absorbing characteristics of C/Co-Mn and C/Co-Zn doped barium hexaferrite sandwiched nanocomposites Rodziah, Nazlan Ismayadi, Ismail Idza Riati, Ibrahim Fadzidah, Mohd Idris Mohamad Ashry, Jusoh Khamirul Amin, Matori QC Physics TP Chemical technology The development of high reflection loss and broad frequency bandwidth for microwave absorbing materials (MAMs) has been intensified in recent years. Carbon nanocomposites have stimulated attention as the EM-wave absorbing materials due to their high conductivity with high dissipating capability of electrostatic charges and EM-wave radiation shielding. In this study, we report on the analysis of microwave absorption through absorption spectrum of carbon/barium hexaferrite nanocomposites with Co-Mn and Co-Zn as dopants. The nanoparticles of Co-Mn-doped and Co-Zn-doped barium hexaferrites were synthesised using the mechanical alloying technique. The resultant particles were then mixed thoroughly with epoxy resin with ratio of 8:92 wt.% prior to sandwich with carbon black layer at different thicknesses of 1, 2 and 3 mm to form nanocomposites. The samples were characterised on their morphological, magnetic and microwave properties using field emission scanning electron microscope (FESEM), vibrating sample magnetometer (VSM) and vector network analyser (VNA) respectively; there follow rational discussions on the effect of dopant substitutions and microstructure on the absorption/reflection loss and bandwidth broadening of MAM. The results show that the saturation magnetisation of BaCoZnFe16O27 is higher as compared to that of BaCoMnFe16O27 and pure BaFe12O19 in which Zn behaves as an ion modifier that compensates the magnetic moment in hexaferrite sublattices, thus translated into an increase of net magnetic moment per unit volume of the sample. By using carbon black as a matching layer and BaCoMnFe16O27 as an absorbing layer with total sandwich thickness of 2 mm, the highest reflection loss of 39.83 dB was obtained. The capability to tune the absorption and bandwidth of all the samples at various frequencies indicates that these materials would be a superior MAM. Through scrutinisation of relationship between absorption/reflection loss with different dopants and thickness variation, further discussion on mechanism of adsorption/reflection characteristics for research optimisation would be provided. Inderscience Enterprises Ltd. 2021 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/33193/1/IJNT%2017%2811-12%29%20Paper%2002.pdf pdf en http://umpir.ump.edu.my/id/eprint/33193/7/Electromagnetic%20wave%20absorbing%20characteristics%20.pdf Rodziah, Nazlan and Ismayadi, Ismail and Idza Riati, Ibrahim and Fadzidah, Mohd Idris and Mohamad Ashry, Jusoh and Khamirul Amin, Matori (2021) Electromagnetic wave absorbing characteristics of C/Co-Mn and C/Co-Zn doped barium hexaferrite sandwiched nanocomposites. International Journal of Nanotechnology (IJNT), 17 (11-12). pp. 757-770. ISSN 1475-7435 (print); 1741-8151 (online). (Published) https://doi.org/10.1504/IJNT.2020.112379 https://doi.org/10.1504/IJNT.2020.112379 |
| spellingShingle | QC Physics TP Chemical technology Rodziah, Nazlan Ismayadi, Ismail Idza Riati, Ibrahim Fadzidah, Mohd Idris Mohamad Ashry, Jusoh Khamirul Amin, Matori Electromagnetic wave absorbing characteristics of C/Co-Mn and C/Co-Zn doped barium hexaferrite sandwiched nanocomposites |
| title | Electromagnetic wave absorbing characteristics of C/Co-Mn and C/Co-Zn doped barium hexaferrite sandwiched nanocomposites |
| title_full | Electromagnetic wave absorbing characteristics of C/Co-Mn and C/Co-Zn doped barium hexaferrite sandwiched nanocomposites |
| title_fullStr | Electromagnetic wave absorbing characteristics of C/Co-Mn and C/Co-Zn doped barium hexaferrite sandwiched nanocomposites |
| title_full_unstemmed | Electromagnetic wave absorbing characteristics of C/Co-Mn and C/Co-Zn doped barium hexaferrite sandwiched nanocomposites |
| title_short | Electromagnetic wave absorbing characteristics of C/Co-Mn and C/Co-Zn doped barium hexaferrite sandwiched nanocomposites |
| title_sort | electromagnetic wave absorbing characteristics of c/co-mn and c/co-zn doped barium hexaferrite sandwiched nanocomposites |
| topic | QC Physics TP Chemical technology |
| url | http://umpir.ump.edu.my/id/eprint/33193/ http://umpir.ump.edu.my/id/eprint/33193/ http://umpir.ump.edu.my/id/eprint/33193/ http://umpir.ump.edu.my/id/eprint/33193/1/IJNT%2017%2811-12%29%20Paper%2002.pdf http://umpir.ump.edu.my/id/eprint/33193/7/Electromagnetic%20wave%20absorbing%20characteristics%20.pdf |