@ARTICLE{Jia200816968,
author={Jia, C.-J.a  and Sun, L.-D.a  and Luo, F.b  and Han, X.-D.c  and Heyderman, L.J.b  and Yan, Z.-G.a  and Yan, C.-H.a  and Zheng, K.c  and Zhang, Z.c  and Takano, M.d  and Hayashi, N.d  and Eltschka, M.e  and Kläui, M.e  and Rüdiger, U.e  and Kasama, T.f  and Cervera-Gontard, L.g  and Dunin-Borkowski, R.E.g  and Tzvetkov, G.h  and Raabe, J.h },
title={Large-scale synthesis of single-crystalline iron oxide magnetic nanorings},
journal={Journal of the American Chemical Society},
year={2008},
volume={130},
number={50},
pages={16968-16977},
doi={10.1021/ja805152t},
note={cited By 245},
url={https://www.scopus.com/inward/record.url?eid=2-s2.0-58049220406&partnerID=40&md5=57fd0fba3586521af36e205bdd43f029},
affiliation={Beijing National Laboratory for Molecular Sciences, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, China; Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland; Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100022, China; Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan; Fachbereich Physik, Universität Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany; Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, United Kingdom; Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark; Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland},
abstract={We present an innovative approach to the production of single-crystal iron oxide nanorings employing a solution-based route. Single-crystal hematite (α-Fe2O3) nanorings were synthesized using a double anion-assisted hydrothermal method (involving phosphate and sulfate ions), which can be divided into two stages: (1) formation of capsule-shaped α-Fe 2O3 nanoparticles and (2) preferential dissolution along the long dimension of the elongated nanoparticles (the c axis of α-Fe 2O3) to form nanorings. The shape of the nanorings is mainly regulated by the adsorption of phosphate ions on faces parallel to c axis of α-Fe2O3 during the nanocrystal growth, and the hollow structure is given by the preferential dissolution of the α-Fe 2O3 along the c axis due to the strong coordination of the sulfate ions. By varying the ratios of phosphate and sulfate ions to ferric ions, we were able to control the size, morphology, and surface architecture to produce a variety of three-dimensional hollow nanostructures. These can then be converted to magnetite (Fe3O4) and maghemite (γ-Fe3O4) by a reduction or reduction-oxidation process while preserving the same morphology. The structures and magnetic properties of these single-crystal α-Fe3O4, Fe 3O4, and γ-Fe3O4 nanorings were characterized by various analytical techniques. Employing off-axis electron holography, we observed the classical single-vortex magnetic state in the thin magnetite nanorings, while the thicker rings displayed an intriguing three-dimensional magnetic configuration. This work provides an easily scaled-up method for preparing tailor-made iron oxide nanorings that could meet the demands of a variety of applications ranging from medicine to magnetoelectronics. © 2008 American Chemical Society.},
document_type={Article},
source={Scopus},
}

{"_id":"zeFMpZvMkH8Lkvk7i","bibbaseid":"jia-sun-luo-han-heyderman-yan-yan-zheng-etal-largescalesynthesisofsinglecrystallineironoxidemagneticnanorings-2008","downloads":0,"creationDate":"2016-04-21T08:09:54.618Z","title":"Large-scale synthesis of single-crystalline iron oxide magnetic nanorings","author_short":["Jia, C.","Sun, L.","Luo, F.","Han, X.","Heyderman, L.","Yan, Z.","Yan, C.","Zheng, K.","Zhang, Z.","Takano, M.","Hayashi, N.","Eltschka, M.","Kläui, M.","Rüdiger, U.","Kasama, T.","Cervera-Gontard, L.","Dunin-Borkowski, R.","Tzvetkov, G.","Raabe, J."],"year":2008,"bibtype":"article","biburl":"http://www2.uca.es/dept/cmat_qinor/nanomat/people/GROUP.bib","bibdata":{"bibtype":"article","type":"article","author":[{"propositions":[],"lastnames":["Jia"],"firstnames":["C.-J.a"],"suffixes":[]},{"propositions":[],"lastnames":["Sun"],"firstnames":["L.-D.a"],"suffixes":[]},{"propositions":[],"lastnames":["Luo"],"firstnames":["F.b"],"suffixes":[]},{"propositions":[],"lastnames":["Han"],"firstnames":["X.-D.c"],"suffixes":[]},{"propositions":[],"lastnames":["Heyderman"],"firstnames":["L.J.b"],"suffixes":[]},{"propositions":[],"lastnames":["Yan"],"firstnames":["Z.-G.a"],"suffixes":[]},{"propositions":[],"lastnames":["Yan"],"firstnames":["C.-H.a"],"suffixes":[]},{"propositions":[],"lastnames":["Zheng"],"firstnames":["K.c"],"suffixes":[]},{"propositions":[],"lastnames":["Zhang"],"firstnames":["Z.c"],"suffixes":[]},{"propositions":[],"lastnames":["Takano"],"firstnames":["M.d"],"suffixes":[]},{"propositions":[],"lastnames":["Hayashi"],"firstnames":["N.d"],"suffixes":[]},{"propositions":[],"lastnames":["Eltschka"],"firstnames":["M.e"],"suffixes":[]},{"propositions":[],"lastnames":["Kläui"],"firstnames":["M.e"],"suffixes":[]},{"propositions":[],"lastnames":["Rüdiger"],"firstnames":["U.e"],"suffixes":[]},{"propositions":[],"lastnames":["Kasama"],"firstnames":["T.f"],"suffixes":[]},{"propositions":[],"lastnames":["Cervera-Gontard"],"firstnames":["L.g"],"suffixes":[]},{"propositions":[],"lastnames":["Dunin-Borkowski"],"firstnames":["R.E.g"],"suffixes":[]},{"propositions":[],"lastnames":["Tzvetkov"],"firstnames":["G.h"],"suffixes":[]},{"propositions":[],"lastnames":["Raabe"],"firstnames":["J.h"],"suffixes":[]}],"title":"Large-scale synthesis of single-crystalline iron oxide magnetic nanorings","journal":"Journal of the American Chemical Society","year":"2008","volume":"130","number":"50","pages":"16968-16977","doi":"10.1021/ja805152t","note":"cited By 245","url":"https://www.scopus.com/inward/record.url?eid=2-s2.0-58049220406&partnerID=40&md5=57fd0fba3586521af36e205bdd43f029","affiliation":"Beijing National Laboratory for Molecular Sciences, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, China; Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland; Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100022, China; Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan; Fachbereich Physik, Universität Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany; Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, United Kingdom; Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark; Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland","abstract":"We present an innovative approach to the production of single-crystal iron oxide nanorings employing a solution-based route. Single-crystal hematite (α-Fe2O3) nanorings were synthesized using a double anion-assisted hydrothermal method (involving phosphate and sulfate ions), which can be divided into two stages: (1) formation of capsule-shaped α-Fe 2O3 nanoparticles and (2) preferential dissolution along the long dimension of the elongated nanoparticles (the c axis of α-Fe 2O3) to form nanorings. The shape of the nanorings is mainly regulated by the adsorption of phosphate ions on faces parallel to c axis of α-Fe2O3 during the nanocrystal growth, and the hollow structure is given by the preferential dissolution of the α-Fe 2O3 along the c axis due to the strong coordination of the sulfate ions. By varying the ratios of phosphate and sulfate ions to ferric ions, we were able to control the size, morphology, and surface architecture to produce a variety of three-dimensional hollow nanostructures. These can then be converted to magnetite (Fe3O4) and maghemite (γ-Fe3O4) by a reduction or reduction-oxidation process while preserving the same morphology. The structures and magnetic properties of these single-crystal α-Fe3O4, Fe 3O4, and γ-Fe3O4 nanorings were characterized by various analytical techniques. Employing off-axis electron holography, we observed the classical single-vortex magnetic state in the thin magnetite nanorings, while the thicker rings displayed an intriguing three-dimensional magnetic configuration. This work provides an easily scaled-up method for preparing tailor-made iron oxide nanorings that could meet the demands of a variety of applications ranging from medicine to magnetoelectronics. © 2008 American Chemical Society.","document_type":"Article","source":"Scopus","bibtex":"@ARTICLE{Jia200816968,\r\nauthor={Jia, C.-J.a and Sun, L.-D.a and Luo, F.b and Han, X.-D.c and Heyderman, L.J.b and Yan, Z.-G.a and Yan, C.-H.a and Zheng, K.c and Zhang, Z.c and Takano, M.d and Hayashi, N.d and Eltschka, M.e and Kläui, M.e and Rüdiger, U.e and Kasama, T.f and Cervera-Gontard, L.g and Dunin-Borkowski, R.E.g and Tzvetkov, G.h and Raabe, J.h },\r\ntitle={Large-scale synthesis of single-crystalline iron oxide magnetic nanorings},\r\njournal={Journal of the American Chemical Society},\r\nyear={2008},\r\nvolume={130},\r\nnumber={50},\r\npages={16968-16977},\r\ndoi={10.1021/ja805152t},\r\nnote={cited By 245},\r\nurl={https://www.scopus.com/inward/record.url?eid=2-s2.0-58049220406&partnerID=40&md5=57fd0fba3586521af36e205bdd43f029},\r\naffiliation={Beijing National Laboratory for Molecular Sciences, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, China; Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland; Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100022, China; Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan; Fachbereich Physik, Universität Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany; Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, United Kingdom; Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark; Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland},\r\nabstract={We present an innovative approach to the production of single-crystal iron oxide nanorings employing a solution-based route. Single-crystal hematite (α-Fe2O3) nanorings were synthesized using a double anion-assisted hydrothermal method (involving phosphate and sulfate ions), which can be divided into two stages: (1) formation of capsule-shaped α-Fe 2O3 nanoparticles and (2) preferential dissolution along the long dimension of the elongated nanoparticles (the c axis of α-Fe 2O3) to form nanorings. The shape of the nanorings is mainly regulated by the adsorption of phosphate ions on faces parallel to c axis of α-Fe2O3 during the nanocrystal growth, and the hollow structure is given by the preferential dissolution of the α-Fe 2O3 along the c axis due to the strong coordination of the sulfate ions. By varying the ratios of phosphate and sulfate ions to ferric ions, we were able to control the size, morphology, and surface architecture to produce a variety of three-dimensional hollow nanostructures. These can then be converted to magnetite (Fe3O4) and maghemite (γ-Fe3O4) by a reduction or reduction-oxidation process while preserving the same morphology. The structures and magnetic properties of these single-crystal α-Fe3O4, Fe 3O4, and γ-Fe3O4 nanorings were characterized by various analytical techniques. Employing off-axis electron holography, we observed the classical single-vortex magnetic state in the thin magnetite nanorings, while the thicker rings displayed an intriguing three-dimensional magnetic configuration. 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