1. Point field emitters based on rod-like ZnO nanocrystals
- Author
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L N Demianets, N A Kiselev, and V V Artemov
- Subjects
History ,Materials science ,business.industry ,chemistry.chemical_element ,Nanotechnology ,Tungsten ,Rod ,Computer Science Applications ,Education ,Radius of curvature (optics) ,law.invention ,Field electron emission ,Nanocrystal ,chemistry ,law ,Optoelectronics ,business ,Micromanipulator ,Anisotropy ,Pyrolysis - Abstract
New semiconducting anisotropic materials for field emitters, such as ZnO, are of interest from practical and scientific standpoints. Usually, rod-like nanocrystals have a length of few hundred microns and a radius of curvature less than hundred nm. In the present work, rod-like nanocrystals ZnO with high aspect ratio are investigated. They are obtained by high-temperature pyrolysis of Zn compounds. FIB Quanta 200 3D is used for preparation, structure characterization and field emission experiments. With the help of a Kleindiek micromanipulator, the most suitable crystal rods are transferred to the tungsten needle tip and fixed using tungsten gaseous injection system (GIS). As a result, ZnO point emitters are formed with a tip radius of curvature less than 50 nm. Emission characteristics revealed a field amplification coefficient (β) of about 1500 for an anode-cathode distance of 50 μm.
- Published
- 2011
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