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High coercivity sized controlled cobalt–gold core–shell nano-crystals prepared by reverse microemulsion


Citation

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

Abstract

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.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.1016/j.materresbull.2013.06.021
Publisher: Elsevier
Keywords: A. Magnetic materials; A. Nanostructures; B. Chemical synthesis; B. Magnetic properties; C. X-ray diffraction
Depositing User: Nabilah Mustapa
Date Deposited: 05 Jun 2017 05:03
Last Modified: 05 Jun 2017 05:03
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.materresbull.2013.06.021
URI: http://psasir.upm.edu.my/id/eprint/52185
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