Fabrication and field emission properties of needle-shaped MoO3 nanobelts

Slab-sided and needle-shaped MoO3 nanobelts with preferred (0 1 0) orientation normal to the surfaces of Cu coated quartz substrates were fabricated by RF-magnetron sputtering. The threshold fields with the separation of 100 μm and 150 μm between the anode and the sample were successfully controlled to be 6.17 and 5.13 MV/m, respectively. Their enhancement factors were improved to 5928 and 6960, respectively. In addition, the current fluctuation with time at a fixed voltage was limited to be within 4%. These excellent results demonstrated that the as-grown needle-shaped MoO3 nanobelt structure could be a promising candidate for the electronic display devices.