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Journal of Electron Microscopy Advance Access published online on December 14, 2007
Journal of Electron Microscopy, doi:10.1093/jmicro/dfm035
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Polarity Determination for the CdxZn1-xS Nanocombs by EELS

X. Z. Zhang1, T. Y. Zhai2, Y. Ma2, J. N. Yao2 and D. P. Yu1,*

1 State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, People's Republic of China
2 Key Laboratory of Photochemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China

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

Comb-like CdxZn1-xS nanostructures have been synthesized by one-step metallo-organic chemical vapor deposition (MOCVD). The microstructure and composition were characterized by analytical transmission electron microscopy (TEM). The ribbon of the comb-like structure is along [2-1-10] (the a-axis), and the nanotips are along [0001] (the c-axis). The atomic location by channeling-enhanced microanalysis (ALCHEMI) technique was used to determine the polarity of the crystal via electron energy-loss spectroscopy (EELS). The thickness dependence, delocalization and beam convergent effect are discussed here. The investigations reveal that the growth mechanism is consistent with the asymmetric growth.

Keywords     ALCHEMI, EELS, polarity, delocalization, convergence angle, nanocombs

Received      7 July 2007, accepted 25 November 2007


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