Observations on the effect of coating Nano-Tip Apex with a thin layer of dielectric material on both electron and Ion Emission Mechanisms

0536984 - ÚPT 2021 MA eng A - Abstract
Al Soud, A. - Boll, T. - Knápek, Alexandr - Mousa, M. S.
Observations on the effect of coating Nano-Tip Apex with a thin layer of dielectric material on both electron and Ion Emission Mechanisms.
Fifth edition of International Symposium on Dielectric Materials and Applications. ISyDMA’5 Virtual Edition. Semlalia: Semlalia Cadi Ayyad University, 2020. s. 135.
[International Symposium on Dielectric Materials and Applications. ISyDMA’5 /5./. 15.04.2020-17.04.2020, Semlalia]
Institutional support: RVO:68081731
Keywords : field electron emission * field ion emission * epoxylite resin
OECD category: Coating and films

This paper analyses the differences that occurred on field electron emission and ion emission after coating some tungsten tips with a thin layer of dielectric material. Additionally, the mechanism of emission of electrons through channels forming in the dielectric material is described. For the purposes of analysis, the emitters were prepared by coating a tungsten tip with a layer of Epoxylite® resin. A high-resolution scanning electron microscope (HRSEM) was used to scan the tip profile and measure the coating thickness. Field electron microscope (FEM) and Field ion microscope (FIM) have been used to study both: the emission-current distribution and the emission-ions distribution from the composite emitters. Two forms of emission patterns have been observed: a multi-spot pattern, from the clean emitters with irregularity in the substrate, and a bright single- spot pattern, from coated emitters with a high substrate.
Permanent Link: http://hdl.handle.net/11104/0314738