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0222U003482,
0121U109987
,
Physical bases of technologies of creation of electron-emitting surfaces with low work of an exit and negative electronic affinity
Horiachko Andrii M., Доктор фізико-математичних наук
03-04-2022
Taras Shevchenko National University of Kyiv
Object of research - Nanoscale systems of Gd and Ce oxides on Si and Mo surfaces. Objective - Development of the physical basis of the technology of preparation of cathode surfaces with applied layers of oxides of rare earth metals, which have a low yield, high quantum yield, and a high coefficient of secondary electronic emission. Research methods - Experimental methods: Auger and photoelectron spectroscopy, slow electron diffraction, scanning probe microscopy. Theoretical methods: numerical calculations based on the first principles using freely available program codes. The physical bases of the technology of manufacturing electron-emitting surfaces by self-assembly in an electric field of nanoscale relief in the form of nanovisters or nanofibers from a material with a large width of the forbidden zones on a silicon or molybdenum substrate, including series and gadolinium oxides. An analytical model for calculating the electron emission current from the obtained surfaces is proposed and estimation calculations are performed in accordance with experimentally measured structural parameters of these surfaces. They clearly demonstrate the possibilities of practical application for the creation of efficient autoelectronic cathodes. Analytical calculations of the magnitude of the electric field on the obtained nanostructured surfaces are confirmed numerical solutions of the Poisson equation for one-dimensional protrusions, which reproduced the curvature of surfaces at the vertices of experimentally created nanostructures. A prototype for experimental measurements of autoelectronic emission current from emitting surfaces was created and an experimental installation for the production of nanofibers from oxide materials by electrospinning and their application to the substrate was built.
Moiseienko Vladyslav A.
Osypenko Yuliya А.
Slobodianiuk Denys V.
Strikha Maksym V.
Fedorchenko Mykola І.
2022-04-03
Updated: 2025-12-08
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