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...

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Autores principales: Cao, Xiaobing, Wang, Weihua, Zhang, Xinghua, Li, Luyan, Cheng, Yahui, Liu, Hui, Du, Sichao, Zheng, Rongkun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2013
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.
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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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