Growth, Photoluminescence, and Field Emission of Hierarchical ZnO Nanostructures
Hierarchical ZnO nanostructures with the morphology of sleeve-fishes have been fabricated on Si substrate through vapor phase transport at 850 °C. Studies find that each nansleeve-fish is composed of a screw-shaped microrod and some tapering nanowires grown on the microrod, all of which grow along the  direction. Photoluminescence spectra exhibits strong UV emission around 385 nm without any green emissions detected, indicating that the high-quality ZnO nanostructures with low level of oxygen vacancies are obtained in our experiment. Field-emission measurements on the nanosleeve-fishes show a turn-on field as low as 2.2 V/μm at a current density of 0.1 μA/cm2 with a anode-sample separation of 600 μm, and the emission current density reached 1 mA/cm2 at an applied field of about 5.8 V/μm. The excellent field emission properties from such kind of nanostructures make them promising candidates for further applications in FE microelectronic devices.
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Document Type: Research Article
Publication date: 2006-12-01
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