  In this study, we report the enhancement in field emission (FE) properties of
ZnO nanostructure by Ni doping at the base pressure of ~1 x 10-8 mbar, which
were grown by the simple wet chemical process. ZnO nanostructure shows single
crystalline wurtzite structure up to Ni 10% doping. FESEM represents change in
the nanostructure morphology from thick nanoneedles to nanoflakes via thin
nanorods with increase in Ni doped ZnO. The turn-on field required to draw a
field emission (FE) current density at 1{\mu}A/cm2 is found to be 2.5, 2.3, 1.8
and 1.7 V/{\mu}m for ZnO(Ni0%), ZnO(Ni5%), ZnO(Ni7.5%) and ZnO(Ni10%),
respectively.
