Abstract
Vertically well-aligned ZnO nanocolumns were grown on Al 2O 3 (0 0 0 1) substrates via metalorganic chemical vapor deposition without using any metal catalyst. Their morphology was investigated as a function of the growth temperature ( T g), which was found to be a key processing parameter to control their shape. At T g ⩾ 450 ° C , vertically well-aligned ZnO nanocolumns started to grow. It was found that a higher T g yielded slimmer, needle shaped nanocolumns, whereas a lower T g yielded thicker nanocolumns.
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