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Journal of Electron Microscopy Advance Access published online on May 18, 2009
Journal of Electron Microscopy, doi:10.1093/jmicro/dfp026
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Characterization of Mn-doped ZnO nanobelts by electron energy-loss spectroscopy

Jingmin Zhang*, Chao Yu, Zhimin Liao, Xinzheng Zhang, Liping You and Dapeng Yu

Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, People's Republic of China

* To whom correspondence should be addressed. E-mail: zhang_jmin{at}pku.edu.cn

Mn-doped ZnO nanobelts have been synthesized via the vapor phase evaporation method, which exhibited ferromagnetism at room temperature. Electron energy-loss spectroscopy was used to investigate the chemical state of Mn dopants. It revealed that the Mn species had the chemical valence of +2. Meanwhile, the fine structures of the Mn L23 edges indicated that the Mn dopant was located at the center of an oxygen octahedron but not an oxygen tetrahedron. This suggested that the Mn dopants did not substitute on the Zn sites as expected and sub-nanoscale MnO clusters had been formed in the synthesized ZnO nanobelts.

Keywords     diluted magnetic semiconductors, electron energy-loss spectroscopy, energy-filtered TEM

Received     20 March 2009, accepted 28 April 2009


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