The effect of the interaction of barium atoms on the surface of the rhenium field emitter on the work function
D.P. Bernatskii, V.G. Pavlov
Ioffe Institute
DOI: 10.26456/pcascnn/2022.14.031
Original article
Abstract: Modification of the emission surface on a nanometer scale during adsorption of barium atoms on the surface of a rhenium field emitter was investigated using field electron and desorption microscopy. Field electronic images of the emitter surface reflecting the localization of barium atoms on the emitter surface, representing the quasi-spherical surface of a rhenium single crystal, were obtained. The influence of the temperature of the emitter with adsorbed barium on the change in the emitter work function is shown. Deposition at room temperature leads to the appearance of a dependence of the work function on the concentration of adsorbate with a minimum in the area of optimal coating. Annealing of the emitter at T = 600 K after deposition of each portion of barium causes the minimum to disappear. After reaching the minimum value (optimal coverage with adsorbed atoms), the work function remains constant with an increase in the number of adsorbed barium atoms on the surface of the emitter. A sharp change in the localization of barium atoms due to a phase transition with the formation of islands in the region of the rhenium face was detected on the field electronic image. The change in the nature of the dependence of the work function is associated with a phase transition in the barium film with the formation of barium islands. The concentration of barium in the islet is constant and corresponds to the optimal coating.
Keywords: field emitters, field electron and desorption microscope, adsorption, rhenium, barium
- Dmitrii P. Bernatskii – Ph.D., Senior Researcher, Ioffe Institute
- Victor G. Pavlov – Dr. Sc., Senior Researcher, Ioffe Institute
Reference:
Bernatskii, D.P. The effect of the interaction of barium atoms on the surface of the rhenium field emitter on the work function / D.P. Bernatskii, V.G. Pavlov // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2022. — I. 14. — P. 31-38. DOI: 10.26456/pcascnn/2022.14.031. (In Russian).
Full article (in Russian): download PDF file
References:
1. Sominskii G.G., Tumareva T.A., Taradaev E.P. et al. Annular multi-tip field emitters with metal–fullerene protective coatings, Technical Physics, 2019, vol. 64, issue 2, pp. 270-273. DOI: 10.1134/S106378421902021X.
2. Williams D.B., Carter C.B. Electron sources,Transmission electron microscopy. A textbook for materials science, 2nd ed., Boston, Springer, 2009, pp. 73-89. DOI: 10.1007/978-0-387-76501-3_5.
3. Tumareva T.A., Sominskii G.G. Operation of activated-fullerene-coated field emitters in technical vacuum, Technical Physics, 2013, vol. 58, issue 7, pp. 1048-1051. DOI: 10.1134/S1063784213070232.
4. Baturin A.S., Nikolski K.N., Knyazev A.I., Tchesov R.G., Sheshin E.P. Doping of graphite by an alkaline-earth metal to reduce the work function, Technical Physics, 2004, vol. 49, issue 3, pp. 342-344. DOI: 10.1134/1.1688422.
5. Müller E.W., Tsong T.T. Field ion microscopy, field ionization and field evaporation, Progress in Surface Science, 1974, vol. 4, pp. 1-139. DOI: 10.1016/S0079-6816(74)80005-5.
6. Bernatskii D.P., Pavlov V.G. Investigation of a solid surface using continuous-mode field-desorption microscopy, Bulletin of the Russian Academy of Sciences: Physics, 2009, vol. 73, issue 5, pp. 673-675. DOI: DOI: 10.3103/S1062873809050438.
7. Suchorski Y. Field ion and field desorption microscopy: principles and applications, Surface science tools for nanomaterials characterization, ed. by C.S.S.R. Kumar. Berlin, Heidelberg, Springer-Verlag, 2015, pp. 227-272. DOI: 10.1007/978-3-662-44551-8_7.
8. Field-ion microscopy: based upon a short lecture course, ed. by J.J. Hren, S. Ranganathan. New York, Springer US, 1968. xiv, 244 p. DOI: 10.1007/978-1-4899-6513-4.
9. Beach Th., Vanselow R. Adsorption studies of aluminum oxide on rhenium by means of field emission microscopy, Applied physics, 1974, vol.4, issue 3, pp. 265-270. DOI: 10.1007/BF00884238.
10. Braun O.M., Medvedev V.K. Interaction between particles adsorbed on metal surfaces, Soviet Physics Uspekhi, 1989, vol. 32, issue 4, pp. 328-348. DOI: 10.1070/PU1989v032n04ABEH002700.
11. Rut’kov E.V., Gall’ N.R. The determining influence of the perimeter of graphene islands on phase equilibria in graphene–metal system containing dissolved carbon, Physics of the Solid State, 2020, vol. 62, issue 3, pp. 580-585. DOI: 10.1134/S1063783420030191.
12. Bernatskii D.P., Pavlov V.G. Polevaya desorbtsiya tseziya s nanostrukturirovannoj poverkhnosti reniya [Field desorption of cesium atoms from nanostructured rhenium surface], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2017, issue 9, pp.89-93. DOI: 10.26456/pcascnn/2017.9.089. (In Russian).