Programmable set-up for electrochemical preparation of STM tips and ultra-sharp field emission cathodes
| Autor: | Dinara Sobola, Jiří Sýkora, Alexandr Knápek, Jana Chlumská |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
chemistry.chemical_element Nanotechnology 02 engineering and technology Tungsten 01 natural sciences law.invention law Etching (microfabrication) 0103 physical sciences Surface layer Electrical and Electronic Engineering 010302 applied physics business.industry 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics Cathode Surfaces Coatings and Films Electronic Optical and Magnetic Materials Field electron emission Low-energy electron microscopy chemistry Optoelectronics Crystallite 0210 nano-technology business Single crystal |
| Zdroj: | Microelectronic Engineering. 173:42-47 |
| ISSN: | 0167-9317 |
| DOI: | 10.1016/j.mee.2017.04.002 |
| Popis: | This paper describes a newly designed set-up which is intended for automated preparation both for STM tips and for ultra-sharp field emission cathodes made of polycrystalline and single crystal tungsten in laboratory conditions. The newly designed set-up incorporates electrochemical etching of a wire in the surface layer of an electrolyte and also the so called drop-off method which consists of two steps and requires more precise wire and current setting. Additionally, the method was extended for polycrystalline wires of tungsten using a special cut-off algorithm, which deals with variable etching speed for various crystallographic orientation of the current grain. Produced tips are examined using scanning low energy electron microscopy as for the surface and by the occurrence of electron field-emission as for the geometry based on the Fowler-Nordheim analysis. STM performance of the produced tip is discussed and examined as well. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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