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Metal Ions Induce Growth and Magnetism Alternation of α-Fe2O3 Crystals Bound by High-Index Facets

  1. Rongmei Liu1,2,3,
  2. Yuanwen Jiang1,2,
  3. Hao Fan1,2,
  4. Prof. Qingyi Lu1,*,
  5. Wei Du1,2,
  6. Prof. Feng Gao2,*

Article first published online: 22 JUN 2012

DOI: 10.1002/chem.201201108

Issue

Chemistry - A European Journal

Chemistry - A European Journal

Volume 18, Issue 29, pages 8957–8963, July 16, 2012

Additional Information

How to Cite

Liu, R., Jiang, Y., Fan, H., Lu, Q., Du, W. and Gao, F. (2012), Metal Ions Induce Growth and Magnetism Alternation of α-Fe2O3 Crystals Bound by High-Index Facets. Chem. Eur. J., 18: 8957–8963. doi: 10.1002/chem.201201108

Author Information

  1. 1

    State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 (P.R. China)

  2. 2

    Department of Materials Science and Engineering, Nanjing University, Nanjing 210093 (P.R. China)

  3. 3

    College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu Anhui 241000 (P.R. China)

*State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 (P.R. China)

Publication History

  1. Issue published online: 10 JUL 2012
  2. Article first published online: 22 JUN 2012
  3. Manuscript Received: 1 APR 2012

Funded by

  • National Basic Research Program of China. Grant Number: 2011CB935800
  • National Natural Science Foundation of China. Grant Numbers: 21071076, 51172106, 21021062
  • Natural Science Foundation of Jiangsu Province. Grant Number: BK2010370

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Keywords:

  • controlled synthesis;
  • crystal engineering;
  • high-index facet;
  • magnetic properties;
  • α-Fe2O3

Abstract

In this study, quasi-cubic and hexagonal bipyramid α-Fe2O3 polyhedrons with high-index facets exposed were controllably synthesized by applying metal ions Zn2+ or Cu2+ as structure-directing agents. The growth of the α-Fe2O3 nanostructures with high-index facets were induced by metal ions without the addition of any other surfactants. The quasi-cubic form controlled by Zn2+ looks like a cube but has an angle of approximately 86° bound by (012), (10-2), and (1-12) facets, whereas the hexagonal bipyramid form controlled by Cu2+ has a sixfold axis bound by {012} facets. Magnetic measurements confirm that these two kinds of nanocrystals display shape- and surface-dependent magnetic behaviors. The hexagonal bipyramid iron oxide nanocrystals show a lower Morin transition temperature of 240 K and might be spin-canted ferromagnetically controlled at room temperature, and the ferromagnetism disappears at low temperature. The quasi-cubic nanocrystals have a splitting between FC curve and ZFC curve from the highest experimental temperature and no Morin transformation occurs; this indicates that they would be defect ferromagnetically controlled at low temperature. The reported metal-ion-directing technique could provide a universal method for shape- and surface-controlled synthesis of nanocrystals with high-index facets exposed.

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