Magnetic properties of fluffy Fe@α-Fe(2)O(3 )core-shell nanowires
Novel fluffy Fe@α-Fe(2)O(3) core-shell nanowires have been synthesized using the chemical reaction of ferrous sulfate and sodium borohydride, as well as the post-annealing process in air. The coercivity of the as-synthesized nanowires is above 684 Oe in the temperature range of 5 to 300 K, which is...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Springer
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3874774/ https://www.ncbi.nlm.nih.gov/pubmed/24134440 http://dx.doi.org/10.1186/1556-276X-8-423 |
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author | Cao, Xiaobing Wang, Weihua Zhang, Xinghua Li, Luyan Cheng, Yahui Liu, Hui Du, Sichao Zheng, Rongkun |
author_facet | Cao, Xiaobing Wang, Weihua Zhang, Xinghua Li, Luyan Cheng, Yahui Liu, Hui Du, Sichao Zheng, Rongkun |
author_sort | Cao, Xiaobing |
collection | PubMed |
description | Novel fluffy Fe@α-Fe(2)O(3) core-shell nanowires have been synthesized using the chemical reaction of ferrous sulfate and sodium borohydride, as well as the post-annealing process in air. The coercivity of the as-synthesized nanowires is above 684 Oe in the temperature range of 5 to 300 K, which is significantly higher than that of the bulk Fe (approximately 0.9 Oe). Through the annealing process in air, the coercivity and the exchange field are evidently improved. Both the coercivity and the exchange field increase with increasing annealing time (T(A)) and reach their maximum values of 1,042 and 78 Oe, respectively, at T(A) = 4 h. The magnetic measurements show that the effective anisotropy is increased with increasing the thickness of theα-Fe(2)O(3) by annealing. The large values of coercivity and exchange field, as well as the high surface area to volume ratio, may make the fluffy Fe@α-Fe(2)O(3) core-shell nanowire a promising candidate for the applications of the magnetic drug delivery, electrochemical energy storage, gas sensors, photocatalysis, and so forth. |
format | Online Article Text |
id | pubmed-3874774 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Springer |
record_format | MEDLINE/PubMed |
spelling | pubmed-38747742013-12-30 Magnetic properties of fluffy Fe@α-Fe(2)O(3 )core-shell nanowires Cao, Xiaobing Wang, Weihua Zhang, Xinghua Li, Luyan Cheng, Yahui Liu, Hui Du, Sichao Zheng, Rongkun Nanoscale Res Lett Nano Express Novel fluffy Fe@α-Fe(2)O(3) core-shell nanowires have been synthesized using the chemical reaction of ferrous sulfate and sodium borohydride, as well as the post-annealing process in air. The coercivity of the as-synthesized nanowires is above 684 Oe in the temperature range of 5 to 300 K, which is significantly higher than that of the bulk Fe (approximately 0.9 Oe). Through the annealing process in air, the coercivity and the exchange field are evidently improved. Both the coercivity and the exchange field increase with increasing annealing time (T(A)) and reach their maximum values of 1,042 and 78 Oe, respectively, at T(A) = 4 h. The magnetic measurements show that the effective anisotropy is increased with increasing the thickness of theα-Fe(2)O(3) by annealing. The large values of coercivity and exchange field, as well as the high surface area to volume ratio, may make the fluffy Fe@α-Fe(2)O(3) core-shell nanowire a promising candidate for the applications of the magnetic drug delivery, electrochemical energy storage, gas sensors, photocatalysis, and so forth. Springer 2013-10-17 /pmc/articles/PMC3874774/ /pubmed/24134440 http://dx.doi.org/10.1186/1556-276X-8-423 Text en Copyright © 2013 Cao et al.; licensee Springer. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Nano Express Cao, Xiaobing Wang, Weihua Zhang, Xinghua Li, Luyan Cheng, Yahui Liu, Hui Du, Sichao Zheng, Rongkun Magnetic properties of fluffy Fe@α-Fe(2)O(3 )core-shell nanowires |
title | Magnetic properties of fluffy Fe@α-Fe(2)O(3 )core-shell nanowires |
title_full | Magnetic properties of fluffy Fe@α-Fe(2)O(3 )core-shell nanowires |
title_fullStr | Magnetic properties of fluffy Fe@α-Fe(2)O(3 )core-shell nanowires |
title_full_unstemmed | Magnetic properties of fluffy Fe@α-Fe(2)O(3 )core-shell nanowires |
title_short | Magnetic properties of fluffy Fe@α-Fe(2)O(3 )core-shell nanowires |
title_sort | magnetic properties of fluffy fe@α-fe(2)o(3 )core-shell nanowires |
topic | Nano Express |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3874774/ https://www.ncbi.nlm.nih.gov/pubmed/24134440 http://dx.doi.org/10.1186/1556-276X-8-423 |
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