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Published in:
01-04-2009
Microstructure studies of ZnO nanoneedles
Published in: Journal of Materials Science: Materials in Electronics | Issue 4/2009
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Abstract
ZnO nanoneedles with uniform diameter and length have been synthesized using thermal evaporation approach. Their microstructure and anisotropic growth mechanism have been studied by means of scanning electron microscopy, high-resolution electron microscopy and convergent-beam electron diffraction. The ZnO polarity induces fast [0001] axial growth of the ZnO nanoneedles which are directed either by high index \( \left\{ {0\bar 112} \right\} \) and \( \left\{ {01\bar 11} \right\} \) planes or by ZnO nanoparticle nuclei formed at the (0001)-Zn growth fronts. Moreover, the {0002} stacking faults are believed to assist the ZnO nanoneedle growth. The \( \left\{ {01\bar 13} \right\} \) slope surfaces at the inactive \( \left( {000\bar 1} \right) \)-O bottom geometrically favor ZnO nanorods growth through \( \left\{ {01\bar 13} \right\} \) twinnings.