Field emission of ZnO nanorods synthesized by sonication

Vertically aligned ZnO nanorods were grown on the substrate by sonication. Transmission electron microscopy, photoluminescence, and X-ray diffraction were performed for nanorods synthesized by sonication, which leads to formation of ZnO crystals. For field emission measurements, ZnO nanorods were used as cathode and a green phosphor coated ITO glass was used as anode, where cathode and anode plates were separated by a spacer of 270 mum. Therefore, due to the easy fabrication process and good field emission characteristics, these sonochemically synthesized ZnO nanorods can be regarded as one of key potential field emitters.