Nanoparticles: Well Shaped Mn3O4 Nano-octahedra with Anomalous Magnetic Behavior and Enhanced Photodecomposition Properties (Small 4/2011)

Authors

  • Yu Li,

    1. State Key Laboratory of Advanced Technology for Materials, Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China
    2. Laboratory of Inorganic Materials Chemistry (CMI), The University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, Belgium
    Current affiliation:
    1. These authors contributed equally to the paper.
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  • Haiyan Tan,

    1. EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
    Current affiliation:
    1. These authors contributed equally to the paper.
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  • Xiao-Yu Yang,

    1. State Key Laboratory of Advanced Technology for Materials, Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China
    2. Laboratory of Inorganic Materials Chemistry (CMI), The University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, Belgium
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  • Bart Goris,

    1. EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
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  • Jo Verbeeck,

    1. EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
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  • Sara Bals,

    1. EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
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  • Pierre Colson,

    1. Group of Research in Energy and Environment from Materials (GreenMat), Chemistry Department B6, University of Liege, B-4000 Liege (Sart-Tilman), Belgium
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  • Rudi Cloots,

    1. Group of Research in Energy and Environment from Materials (GreenMat), Chemistry Department B6, University of Liege, B-4000 Liege (Sart-Tilman), Belgium
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  • Gustaaf Van Tendeloo,

    1. EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
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  • Bao-Lian Su

    Corresponding author
    1. State Key Laboratory of Advanced Technology for Materials, Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China
    2. Laboratory of Inorganic Materials Chemistry (CMI), The University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, Belgium
    • State Key Laboratory of Advanced Technology for Materials, Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China.
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Abstract

Very uniform and well shaped Mn3O4 nano-octahedra are synthesized using a simple hydrothermal method under the help of polyethylene glycol (PEG200) as a reductant and shape-directing agent. The nano-octahedra formation mechanism is monitored. The shape and crystal orientation of the nanoparticles is reconstructed by scanning electron microscopy and electron tomography, which reveals that the nano-octahedra only selectively expose {101} facets at the external surfaces. The magnetic testing demonstrates that the Mn3O4 nano-octahedra exhibit anomalous magnetic properties: the Mn3O4 nano-octahedra around 150 nm show a similar Curie temperature and blocking temperature to Mn3O4 nanoparticles with 10 nm size because of the vertical axis of [001] plane and the exposed {101} facets. With these Mn3O4 nano-octahedra as a catalyst, the photodecomposition of rhodamine B is evaluated and it is found that the photodecomposition activity of Mn3O4 nano-octahedra is much superior to that of commercial Mn3O4 powders. The anomalous magnetic properties and high superior photodecomposition activity of well shaped Mn3O4 nano-octahedra should be related to the special shape of the nanoparticles and the abundantly exposed {101} facets at the external surfaces. Therefore, the shape preference can largely broaden the application of the Mn3O4 nano-octahedra.

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