Journal of Applied Crystallography

Volume 46, Part 2 (April 2013)

research papers

J. Appl. Cryst. (2013). 46, 396-403    [ doi:10.1107/S0021889812051333 ]

Superposition twinning supported by texture in ZnO nanospikes

V. Hrkac, L. Kienle, S. Kaps, A. Lotnyk, Y. K. Mishra, U. Schürmann, V. Duppel, B. V. Lotsch and R. Adelung

Abstract: The morphology and real structure of wurtzite-type ZnO nanospikes grown by the recently introduced flame transport synthesis have been examined by means of advanced transmission electron microscopy (TEM). The rapid synthesis produces nanospikes showing a well defined texture which restricts TEM experiments to a preferred viewing direction of [2 {\overline 1}{\overline 1}3]. Forced by the specific morphology, all of the observed nanospikes show a complicated superposition of twinned domains as an intrinsic real structural feature. The high-resolution contrasts are characterized by lamellar fringes parallel to the (1 {\overline 1} 0 {\overline 1}) planes, and the quasi-kinematic diffraction patterns contain satellite peaks based on multiple scattering. All these phenomena can be interpreted by comparison of experimental and simulated data relying on a supercell approach.

Keywords: ZnO; semiconductor materials; nanostructure; twinning; electron microscopy; crystal growth.

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