Morphological effects on the field emission characteristics of zinc oxide nanotetrapods films |
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| Authors: | Chen Hong-sheng Qi Jun-jie Zhang Yue Liao Qing-liang and Huang Yun-hua |
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| Institution: | (1) Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing, 100083, China;(2) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China |
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| Abstract: | The direct growth of a tetrapod-like ZnO nanostructure has been accomplished by using a thermal oxidation method without any
catalysts. Studies on the field emission properties of the ordered ZnO nanotetrapods films found that the shape of the ZnO
nanotetrapods has considerable effect on their field emission properties, especially the turn-on field and the emission current
density. Compared with the rod-like legs ZnO nanotetrapods, the nanotetrapods with acicular legs have a lower turn-on field
of 2.7 V/μm at a current density of 10 μA/cm2, a high field enhancement factor of 1830, and an available stability. More importantly, the emission current density reached
1 mA/cm2 at a field of 4.8 V/μm without showing saturation. The results could be valuable for using the ZnO nanostructure as a cold-cathode
field-emission material.
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| Keywords: | field emission nanomaterials zinc oxide semiconductors stability analysis |
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