Self-assembly of aligned ZnO nanoscrews: Growth, configuration, and field emission

Liao, L.; Li, J. C.; Liu, D. H.; Liu, C.; Wang, D. F.; Song, W. Z.; Fu, Q.
February 2005
Applied Physics Letters;2/21/2005, Vol. 86 Issue 8, p083106
Academic Journal
We report the syntheses of self-catalyst-grown and self-assembled ZnO nanoscrews (ZNS). The morphology and microstructures were characterized by using scanning electron microscopy, transmission electron microscopy and x-ray diffraction. The results reveal that the aligned ZNS are single crystalline grown along the c axis, with 18 sides on their tops but six sides on their stems, while the whole exhibits sixfold symmetry. The formation of such a special-shaped ZNS that may have potential applications in fabrication of nanodevices, is related to the increase of the oxygen supply during the growth followed by a rapidly cooling down process. The growth kinetics of the ZNS is discussed. The field-emission studies show a good stability of the emission current and a low turn-on electrical field.


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