Publication result detail

Spectroscopic study for the role of polymer binding agent in the quasi-harmonic field emission behavior of polymer graphite field emission cathodes

ALLAHAM, M.; DARADKEH, S.; KOŠELOVÁ, Z.; DALLAEV, R.; SOBOLA, D.; KNÁPEK, A.

Original Title

Spectroscopic study for the role of polymer binding agent in the quasi-harmonic field emission behavior of polymer graphite field emission cathodes

English Title

Spectroscopic study for the role of polymer binding agent in the quasi-harmonic field emission behavior of polymer graphite field emission cathodes

Type

WoS Article

Original Abstract

Graphite-based microcathodes have shown significant performance when operated as cold field emission electron sources. Specifically mentioned, cathodes that have been prepared from highly ordered pyrolytic graphite and polymer graphite pencil leads. Such cathodes are characterized by low operating voltages, a long lifetime, a cheap fabrication price, and a stable emission current. Recently, it was shown that polymer graphite cold field emission cathodes have a unique quasi-harmonic field emission behavior, where the process included emission of pulses of electrons with relatively higher emission current values. However, this behavior has not been reported for other graphite-based materials. In this paper, we study the effects of the polymer binding agent on the charge carriers' flow through the surface of polymer graphite using Raman-current spectroscopy. The results from polymer graphite were then compared to cathodes prepared from colloidal graphite conductive paint when deposited on a glass substrate. The results showed that the I(D)/I(G) ratio of polymer graphite had a fluctuating behavior, which was not the case for colloidal graphite, which had a more stable structure.

English abstract

Graphite-based microcathodes have shown significant performance when operated as cold field emission electron sources. Specifically mentioned, cathodes that have been prepared from highly ordered pyrolytic graphite and polymer graphite pencil leads. Such cathodes are characterized by low operating voltages, a long lifetime, a cheap fabrication price, and a stable emission current. Recently, it was shown that polymer graphite cold field emission cathodes have a unique quasi-harmonic field emission behavior, where the process included emission of pulses of electrons with relatively higher emission current values. However, this behavior has not been reported for other graphite-based materials. In this paper, we study the effects of the polymer binding agent on the charge carriers' flow through the surface of polymer graphite using Raman-current spectroscopy. The results from polymer graphite were then compared to cathodes prepared from colloidal graphite conductive paint when deposited on a glass substrate. The results showed that the I(D)/I(G) ratio of polymer graphite had a fluctuating behavior, which was not the case for colloidal graphite, which had a more stable structure.

Keywords

polymer graphite; colloidal graphite; current-Raman spectroscopy; quasi-harmonic field emission; Raman spectroscopy

Key words in English

polymer graphite; colloidal graphite; current-Raman spectroscopy; quasi-harmonic field emission; Raman spectroscopy

Authors

ALLAHAM, M.; DARADKEH, S.; KOŠELOVÁ, Z.; DALLAEV, R.; SOBOLA, D.; KNÁPEK, A.

Released

17.02.2025

Publisher

IOP Publishing Ltd

Location

BRISTOL

ISBN

0031-8949

Periodical

Physica Scripta

Volume

100

Number

3

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

10

Pages count

10

URL

https://doi.org/10.1088/1402-4896/adb704

Full text in the Digital Library

http://hdl.handle.net/11012/250741

BibTex

@article{BUT197494,
  author="Mohammad Mahmoud Mohammad {Allaham} and Samer Issa Abdel Razzaq {Daradkeh} and Zuzana {Košelová} and Rashid {Dallaev} and Dinara {Sobola} and Alexandr {Knápek}",
  title="Spectroscopic study for the role of polymer binding agent in the quasi-harmonic field emission behavior of polymer graphite field emission cathodes",
  journal="Physica Scripta",
  year="2025",
  volume="100",
  number="3",
  pages="1--10",
  doi="10.1088/1402-4896/adb704",
  issn="0031-8949",
  url="https://doi.org/10.1088/1402-4896/adb704"
}

Documents

Allaham_2025_Phys._Scr._100_035977