Analysis of the relationship between the distribution of a dielectric layer on a nano-tip apex and the distribution of emitted electrons

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A.M. AL-QUDAH, M.S. MOUSA

Abstract. This paper analyses the relationship between the distribution of a dielectric layer on the apex of a metal field electron emitter and the distribution of electron emission. Emitters were prepared by coating a tungsten emitter with a layer of epoxylite resin (Clark Electromedical Instruments Epoxylite resin). A high-resolution scanning electron microscope was used to monitor the emitter profile and measure the coating thickness. Field electron microscope studies of the emission current distribution from these composite emitters have been carried out. The study found a correlation between the thickness distribution of the dielectric layer on the emitter apex and the distribution of electron emission. When the thickness distribution of the dielectric layer on the emitter apex is uniform and smooth, the distribution of electron emission takes the form of a bright single emission spot. When the thickness distribution of the dielectric layer is irregular, the electron emission image exhibits several emission spots.

Keywords
Electron Emission, Nano-Tip Apex, SEM Images, Dielectric Layer

Published online 12/10/2016, 3 pages
Copyright © 2016 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: A.M. AL-QUDAH, M.S. MOUSA, ‘Analysis of the relationship between the distribution of a dielectric layer on a nano-tip apex and the distribution of emitted electrons’, Materials Research Proceedings, Vol. 1, pp 183-185, 2016
DOI: http://dx.doi.org/10.21741/9781945291197-46

The article was published as article 46 of the book Dielectric Materials and Applications

References
[1] Mousa, M.S. (1996), Electron Emission from carbon fiber tips, Appl. Surf. Sci. 94/95, 129-135. http://dx.doi.org/10.1016/0169-4332(95)00521-8
[2] Forbes, R. G., Deane, J. H., Hamid, N., Sim, H. S. (2004), Extraction of emission area from Fowler-Nordheim plots. Journal of Vacuum Science and Technology B. 22, 1222-1226. http://dx.doi.org/10.1116/1.1691410
[3] Fischer, A., Mousa, M. S., and Forbes, R. G. (2013), Influence of barrier form on Fowler-Nordheim plot analysis. J. Vac. Sci. Technol. B 31, 032201. http://dx.doi.org/10.1116/1.4795822
[4] Young, R.D. (1955), Theoretical total -energy distribution of field emitted electrons, Phys. Rev. 113, 110-114. http://dx.doi.org/10.1103/PhysRev.113.110
[5] Latham, R.V., High Voltage and Vacuum Insulation: The Physical Basis (London: Academic, 1981).
[6] Marrese, C.M. (2000), A review of field emission cathode technologies for electric propulsion systems and instruments, IEEE Aerospace Conference Proceedings, 4 85-98. http://dx.doi.org/10.1109/aero.2000.878369
[7] Marulanda, J.M. (Ed.), (Carbon Nanotubes InTech. 2010), pp. 311–340. ISBN: 978-953- 307-054-4.
[8] Mousa, M. S., Fischer A. and Mussa, K. O. (2012), Metallic and composite micropoint cathodes: Aging effect and electronic and spatial characteristics. Jordan J. Phys. 1, 21-26.
[9] Al-Qudah, A. M., Mousa, M. S., Fischer, A. (2015), Effect of insulating layer on the field electron emission performance of nano-apex metallic emitters. IOP Conf. Series: Materials Science and Engineering, 92, 012021. http://dx.doi.org/10.1088/1757-899x/92/1/012021
[10] Latham, R.V. and Salim, M.A. (1987) A microfocus cathode ray tube using an externally stabilised carbon- fiber field-emitting source, J. Phys. E. (Sci. Instr.), 20, 1083.