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Issue 7, 2011
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Synthesis, micro-structural and magnetic properties of Mn-doped ZnO nanowires

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Abstract

Single-crystalline Mn-doped ZnO nanowires of different compositions were synthesized by chemical vapor deposition. Their micro-structures were characterized by high-resolution transmission electron microscopy and X-ray diffraction. The results reveal that Mn doping leads to production of planar and point defects, lattice expansion and disorder. These micro-structural features are also reflected by characteristic changes in the Raman spectra of the nanowires, such as the red-shift and asymmetric broadening of the E2H mode, the appearance of an additional mode, and the anomalous enhancement of the E1(LO) mode. All the doped nanowires show ferromagnetism with a Curie temperature above 350 K. The small effective magnetic moment of ∼0.02 μB/Mn suggests the presence of isolated Mn ions and/or antiferromagnetic superexchange interactions. The long-range ferromagnetic interaction is understood in terms of two possible mechanisms, including the percolation of bound magnetic polarons and surface-hole-mediated ferromagnetic coupling.

Graphical abstract: Synthesis, micro-structural and magnetic properties of Mn-doped ZnO nanowires

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Publication details

The article was received on 15 Oct 2010, accepted on 13 Jan 2011 and first published on 10 Feb 2011


Article type: Paper
DOI: 10.1039/C0CE00730G
Citation: CrystEngComm, 2011,13, 2566-2570
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    Synthesis, micro-structural and magnetic properties of Mn-doped ZnO nanowires

    Y. Rao, H. Xu, Y. Liang and S. Hark, CrystEngComm, 2011, 13, 2566
    DOI: 10.1039/C0CE00730G

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