The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.
High-density, well aligned, -oriented wurtzite ZnO nanorod arrays with significantly different tip shapes were
controllably fabricated by evaporating zinc powders at temperatures varying from 450 to
600 °C. It is found that the tip shape depends not only on the substrate but also on the substrate
direction relative to the auxiliary gas flow, and the radius of curvature at these tips can be
less than 2 nm. These nanorods exhibit good rectification characteristics in conductive
atomic force microscopy (CAFM) measurements; the current rectification can be as large as
∼103
at 1 V. The conductance of these ‘nanotips’ can be tuned readily by simple air-annealing.
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