Comparative Analysis of the Effect of Polystyrene Coating on the Field Emission Characteristic of Tungsten and Carbon Fiber Emitters : Comparative Analysis of the Effect of Polystyrene Coating on the Field Emission Characteristic of Tungsten and Carbon Fiber Emitters

Marwan Mousa; Ildiko Tulbure; Moneeb T. M. Shatnawi; Saleh H. Fawaeer; Alexandr Knápek; Vlasta Sedláková; M-Ali H. Al-Akhras; Mo’tasem Alabth; Mohmmad M. Allaham; Ammar Al Soud; Samer I. Daradkeh; Kipkurui Ronoh; Wala’ M. Al-Qaisi; Dinara Sobola

Authors

Marwan Mousa Prof. Dr.
Ildiko Tulbure University “1 Decembrie 1918”, Alba Iulia 510009, Romania.
Moneeb T. M. Shatnawi Department of Physics, The University of Jordan, Amman 11942, Jordan.
Saleh H. Fawaeer Central European Institute of Technology, Brno University of Technology, Purkyňova123, Brno 612 00, Czech Republic.
Alexandr Knápek Institute of Scientific Instruments of Czech Academy of Sciences, Královopolská 147, Brno 612 00, Czech Republic.
Vlasta Sedláková Department of Physics, Faculty of Electrical Engineering and Communications, Brno University of Technology, Technická 2848/8, Brno 616 00, Czech Republic.
M-Ali H. Al-Akhras Department of Physics, Jordan University of Science and Technology, Irbid 22110, Jordan.
Mo’tasem Alabth Department of Physics, The University of Jordan, Amman 11942, Jordan.
Mohmmad M. Allaham Institute of Scientific Instruments of Czech Academy of Sciences, Královopolská 147, Brno 612 00, Czech Republic.
Ammar Al Soud Central European Institute of Technology, Brno University of Technology, Purkyňova123, Brno 612 00, Czech Republic.
Samer I. Daradkeh Central European Institute of Technology, Brno University of Technology, Purkyňova123, Brno 612 00, Czech Republic.
Kipkurui Ronoh Central European Institute of Technology, Brno University of Technology, Purkyňova123, Brno 612 00, Czech Republic.
Wala’ M. Al-Qaisi Central European Institute of Technology, Brno University of Technology, Purkyňova123, Brno 612 00, Czech Republic.
Dinara Sobola Central European Institute of Technology, Brno University of Technology, Purkyňova123, Brno 612 00, Czech Republic.

Keywords:

Carbon Fibre Emitter; Dielectric Polystyrene Coating; Field Electron Emission; Murphy- Good Plot; Tungsten Emitter.

Abstract

Achieving high initial emission currents at relatively low operating voltages is essential for field electron emission sources utilized in equipment reliant on focused electron beams. Coating these emitters with a dielectric layer has the potential to enlarge their effective emission region, thereby increasing the initial emission current value while simultaneously reducing the operating voltage. This study aims to demonstrate the agreements and differences in the effect of a dielectric polystyrene coating layer on field electron emission characteristic between two studies involving polystyrene-coated field emission emitters. The study provides a brief analysis of the field electron emission characteristic obtained from carbon fiber and tungsten emitters, both prepared using electrochemical etching techniques and covering by a polystyrene coat. Both studies are thoroughly reviewed and contextualized, emphasizing the advantageous attributes of this emitter type. The focus of the study lies in the current-voltage characteristic, Murphy-Good analysis plot, and field electron emission image obtained from both emitters, discussing the coating effect on their field emissivity. The investigation into the emission characteristics of coated tungsten indicates a significant improvement over coated carbon fiber emitters, with performance enhanced several times.

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Comparative Analysis of the Effect of Polystyrene Coating on the Field Emission Characteristic of Tungsten and Carbon Fiber Emitters