High coercivity sized controlled cobalt–gold core–shell nano-crystals prepared by reverse microemulsion
Size-controlled cobalt–gold core–shell nanoparticles were synthesized via the reverse-micelle microemulsion method. In order to control the size of the nanoparticles, the nucleation and growth process were performed within a confined space by adjusting the water to surfactant ratio of reverse micell...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2013
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| Online Access: | http://psasir.upm.edu.my/id/eprint/52185/1/High%20coercivity%20sized%20controlled%20cobalt%E2%80%93gold%20core%E2%80%93shell%20nano-crystals%20prepared%20by%20reverse%20microemulsion.pdf |
| _version_ | 1825930676031979520 |
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| author | Bahmanrokh, Ghazaleh Hashim, Mansor Soltani, Nayereh Ismail, Ismayadi Vaziri, Parisa Navaseri, Manizheh Haghiri, Maryam Erfani Kanagesan, Samikannu |
| author_facet | Bahmanrokh, Ghazaleh Hashim, Mansor Soltani, Nayereh Ismail, Ismayadi Vaziri, Parisa Navaseri, Manizheh Haghiri, Maryam Erfani Kanagesan, Samikannu |
| author_sort | Bahmanrokh, Ghazaleh |
| collection | UPM |
| description | Size-controlled cobalt–gold core–shell nanoparticles were synthesized via the reverse-micelle microemulsion method. In order to control the size of the nanoparticles, the nucleation and growth process were performed within a confined space by adjusting the water to surfactant ratio of reverse micelles solution during synthesis. The crystallinity percentage and percentage of phases presented in Co–Au core–shell nanoparticles were calculated using X-ray diffraction data. The results from transmission electron microscopy provide direct evidence for core–shell structure nanomaterials. Magnetic properties of the samples were investigated using a vibrating sample magnetometer. The as-prepared samples showed significant coercivity at room temperature. The intrinsic blocking temperature was experimentally deduced from zero-field-cooled warmed (ZFC-W) curves by a simple method without employing an external magnetic field. The B-field dependence temperature data of Co–Au nanoparticles exhibited an intrinsic blocking temperature at 45 K. Annealing these samples at 400 °C caused an increase in particle size, crystallinity percentage and further enhanced their magnetic properties. |
| first_indexed | 2024-03-06T09:15:10Z |
| format | Article |
| id | upm.eprints-52185 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T09:15:10Z |
| publishDate | 2013 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | upm.eprints-521852017-06-05T05:03:27Z http://psasir.upm.edu.my/id/eprint/52185/ High coercivity sized controlled cobalt–gold core–shell nano-crystals prepared by reverse microemulsion Bahmanrokh, Ghazaleh Hashim, Mansor Soltani, Nayereh Ismail, Ismayadi Vaziri, Parisa Navaseri, Manizheh Haghiri, Maryam Erfani Kanagesan, Samikannu Size-controlled cobalt–gold core–shell nanoparticles were synthesized via the reverse-micelle microemulsion method. In order to control the size of the nanoparticles, the nucleation and growth process were performed within a confined space by adjusting the water to surfactant ratio of reverse micelles solution during synthesis. The crystallinity percentage and percentage of phases presented in Co–Au core–shell nanoparticles were calculated using X-ray diffraction data. The results from transmission electron microscopy provide direct evidence for core–shell structure nanomaterials. Magnetic properties of the samples were investigated using a vibrating sample magnetometer. The as-prepared samples showed significant coercivity at room temperature. The intrinsic blocking temperature was experimentally deduced from zero-field-cooled warmed (ZFC-W) curves by a simple method without employing an external magnetic field. The B-field dependence temperature data of Co–Au nanoparticles exhibited an intrinsic blocking temperature at 45 K. Annealing these samples at 400 °C caused an increase in particle size, crystallinity percentage and further enhanced their magnetic properties. Elsevier 2013 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/52185/1/High%20coercivity%20sized%20controlled%20cobalt%E2%80%93gold%20core%E2%80%93shell%20nano-crystals%20prepared%20by%20reverse%20microemulsion.pdf Bahmanrokh, Ghazaleh and Hashim, Mansor and Soltani, Nayereh and Ismail, Ismayadi and Vaziri, Parisa and Navaseri, Manizheh and Haghiri, Maryam Erfani and Kanagesan, Samikannu (2013) High coercivity sized controlled cobalt–gold core–shell nano-crystals prepared by reverse microemulsion. Materials Research Bulletin, 48 (10). pp. 4039-4047. ISSN 0025-5408 http://www.sciencedirect.com/science/article/pii/S0025540813005205 10.1016/j.materresbull.2013.06.021 |
| spellingShingle | Bahmanrokh, Ghazaleh Hashim, Mansor Soltani, Nayereh Ismail, Ismayadi Vaziri, Parisa Navaseri, Manizheh Haghiri, Maryam Erfani Kanagesan, Samikannu High coercivity sized controlled cobalt–gold core–shell nano-crystals prepared by reverse microemulsion |
| title | High coercivity sized controlled cobalt–gold core–shell nano-crystals prepared by reverse microemulsion |
| title_full | High coercivity sized controlled cobalt–gold core–shell nano-crystals prepared by reverse microemulsion |
| title_fullStr | High coercivity sized controlled cobalt–gold core–shell nano-crystals prepared by reverse microemulsion |
| title_full_unstemmed | High coercivity sized controlled cobalt–gold core–shell nano-crystals prepared by reverse microemulsion |
| title_short | High coercivity sized controlled cobalt–gold core–shell nano-crystals prepared by reverse microemulsion |
| title_sort | high coercivity sized controlled cobalt gold core shell nano crystals prepared by reverse microemulsion |
| url | http://psasir.upm.edu.my/id/eprint/52185/1/High%20coercivity%20sized%20controlled%20cobalt%E2%80%93gold%20core%E2%80%93shell%20nano-crystals%20prepared%20by%20reverse%20microemulsion.pdf |
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