Abstract
An injector-like nanostructure of ZnO fabricated by hydrothermal method
was tested for field emission (FE) properties. The turn-on field of 3.8 V/$\mu$m was obtained at a current
density of 0.1 $\mu$A/cm$^{2}$. Above the turn-on field,
the emission current density quickly raised up to 1 mA/cm$^{2}$ at about 12.8 V/$\mu$m. The field enhancement factor $\beta$ was estimated to be 2556 and 1226 in the low
and high field regions, respectively. The two-slope FE behavior was attributed
to the adsorbates and defects which were introduced in the fabrication process
in aqueous solution at low temperature. The good FE properties of the ZnO
nanoinjectors indicate that they are applicable as low-cost and low-temperature
cathode materials for FE-based devices.
© 2007 IEEE
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