We report the field emission properties of 50 nm diameter ZnO nanowires that were electrochemically self-assembled within pores of an anodic alumina film. Current versus voltage measurements of the FowlerNordheim tunneling current indicate that the turn-on field is 15 V μm-1 and the field enhancement factor β calculated for two sets of samples turned out to be 670 and 1481, respectively (theoretical value for β in bulk ZnO is 205). The enhancement in β is most likely due to the large aspect ratio of the nanowires. Variation in the length of the nanowires causes the screening effect, which increases the turn-on field and reduces the emission current density. The currentvoltage characteristics of the wires are non-linear and show a rectifying behavior.
|Number of pages||4|
|Journal||Physica E: Low-Dimensional Systems and Nanostructures|
|Publication status||Published - 2010 Nov|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics