Table 1

Comparison of the field emission properties between the different ZnO nanostructures

Type of ZnO nanostructure

Turn-on field (V μm^-1)

Threshold field (V μm^-1)

β

Leaf-like (30 min)

2.94

4.35

2,800

Long NWs arrays (60 min)

3.69

5.72

2,526

Needle-like

3.87

5.65

2,284

Fang et al. Nanoscale Research Letters 2012 7:197   doi:10.1186/1556-276X-7-197