Field Electron Emission Characteristics of Tungsten–Polyethylene Composite Material As a Source of Electron Emission

0568406 - ÚPT 2024 RIV JO eng J - Journal Article
Abu-Najm, N. A. - Shatnawi, M. T. M. - Allaham, Mohammad M. - Mousa, M. S.
Field Electron Emission Characteristics of Tungsten–Polyethylene Composite Material As a Source of Electron Emission.
Jordan Journal of Physics. Roč. 15, č. 5 (2022), s. 537-545. ISSN 1994-7607. E-ISSN 1994-7615
Institutional support: RVO:68081731
Keywords : Composite emitter * Field electron emitter * Field electron microscope * Polyethylene dielectric layer * Scanning electron microscope
OECD category: Particles and field physics
Impact factor: 0.7, year: 2022
Method of publishing: Open access
https://journals.yu.edu.jo/jjp/JJPIssues/Vol15No5pdf2022/11.html

This work provides an experimental study on the effects of polyethylene coating on the field electron emission characteristics of clean (uncoated) tungsten tips. Several tungsten tips, with different apex radii, have been prepared, coated with different thicknesses of polyethylene layers and then examined using a standard field electron emission microscope. Various field electron emission characteristics have been measured under high-vacuum conditions. These include current-voltage characteristics, Fowler-Nordheim plots, scanning electron micrographs and spatial current distributions (electron-emission images). Based on this work, it is proved that coating tungsten tips with polyethylene layers has caused dramatic improvements on the tip emission properties. In particular, coating the tips improves the current-voltage characteristics, which is reflected in lowering the extraction voltage, getting more stable emission currents, expressing the current-voltage characteristics using Fowler-Nordheim plots and finally, the spatial distributions of the emitted electrons for the coated tips are more stable and uniform.
Permanent Link: https://hdl.handle.net/11104/0339717