Fig. 1. Electronic trajectory diagram with different array spacings

Fig. 2. Electric field distribution curves with array spacing of 200 μm，400 μm and 600 μm

Fig. 3. Schematic diagram of field emission test system

Fig. 4. Topography characterization images of patterned ZnO array

Fig. 5. XRD spectra of patterned ZnO nanorod array

Fig. 6. XPS spectrum of patterned ZnO nanorods

Fig. 7. The curves of field emission properties of ZnO nanorods with different array spacings