Journal
MATERIALS RESEARCH EXPRESS
Volume 1, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/1/4/045050
Keywords
ring field emission pattern; ZnO nanowire; initial velocity; adsorbate
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Funding
- National Natural Science Foundation of China [60925001]
- National Key Basic Research Program of China [2010CB327703, 2013CB933601]
- Fundamental Research Funds for Central Universities
- Science and Technology Department of Guangdong Province
- Science & Technology and Information Department of Guangzhou City
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A ring-shaped pattern was observed in the field emission from ZnO nanowires. These ring patterns are different from those previously reported from metallic or carbon nanotube emitters, which occur under high current density. The influences of the applied field and anode to emitter distance on the ring-shaped pattern have been investigated. On the basis of the experiment results, an edge emission model induced by the field desorption has been proposed. Furthermore, it is found that an initial velocity is essential to obtain the desired pattern size. The initial velocity of emitting electron is estimated by using field induced hot electron emission model. Simulation results from the model are consistent with the experimental results.
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