Cluster-Type Structure of Amorphous Smooth Hydrocarbon CDx Films (x ~ 0.5) from T-10 Tokamak | Sciact - CRIS-system of Boreskov Institute of Catalysis

Cluster-Type Structure of Amorphous Smooth Hydrocarbon CDx Films (x ~ 0.5) from T-10 Tokamak Full article

Journal

Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques
ISSN: 1027-4510 , E-ISSN: 1819-7094

Output data

Year: 2017, Volume: 11, Number: 6, Pages: 1208-1215 Pages count : 8 DOI: 10.1134/s1027451017060349

Tags

amorphous carbon films; carbon network; fractal (self-affine) structure; neutron diffraction; small angle X-ray scattering; wide angle X-ray scattering

Authors

Svechnikov N.Yu. ¹ , Stankevich V.G. ¹ , Kolbasov B.N. ¹ , Zubavichus Y.V. ¹ , Veligzhanin A.A. ¹ , Somenkov V.A. ¹ , Sukhanov L.P. ^1,2 , Lebedev A.M. ¹ , Menshikov K.A. ¹

Affiliations

1	National Research Centre Kurchatov Institute
2	Moscow Institute of Physics and Technology

Structure of smooth hydrocarbon CDx films with a high deuterium ratio x ~ 0.5 redeposited from T-10 tokamak D-plasma discharges (NRC Kurchatov Institute, Moscow) has been studied. For the first time, small and wide angle X-ray scattering technique using synchrotron radiation and neutron diffraction have been employed. A fractal structure of CDx films is found to consist of mass-fractals with rough border, surface fractals (with rough surface), plane scatterers and linear chains forming a branched and highly cross-linked 3D carbon network. The found fractals, including sp2 clusters, are of typical size ~1.60 nm. They include a C13 fragment consisting of three interconnected aromatic rings forming a minimal fractal sp2 aggregate 9 × C13. These graphene-like sp2 clusters are interconnected and form a 3D lattice which can be alternatively interpreted as a highly defective graphene layer with a large concentration of vacancies. The unsaturated chemical bonds are filled with D, H atoms, linear sp2 C=C, C=O, and sp3 structural elements like C-C, C-H(D), C-D2,3, C-O, O-H, COOH, CxD(H)y found earlier from the infrared spectra of CDx films, which are binding linear elements of a carbon network. The amorphous structure of CDx films has been confirmed by the results of earlier fractal structure modeling, as well as by researches with X-ray photoelectron spectroscopy which allow finding a definite similarity with the electron structure of their model analogues — polymeric a-C:H and a-C:D films with a disordered carbon network consisting of atoms in sp3 + sp2 states.

Svechnikov N.Y. , Stankevich V.G. , Kolbasov B.N. , Zubavichus Y.V. , Veligzhanin A.A. , Somenkov V.A. , Sukhanov L.P. , Lebedev A.M. , Menshikov K.A.
Cluster-Type Structure of Amorphous Smooth Hydrocarbon CDx Films (x ~ 0.5) from T-10 Tokamak
Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques. 2017. V.11. N6. P.1208-1215. DOI: 10.1134/s1027451017060349 WOS Scopus РИНЦ

Свечников Н.Ю. , Станкевич В.Г. , Колбасов Б.Н. , Зубавичус Я.В. , Велигжанин А.А. , Соменков В.А. , Суханов Л.П. , Лебедев А.М. , Меньшиков К.А.
Кластерная структура аморфных гладких углеводородных пленок CDx (x ~ 0.5) из токамака Т-10
Поверхность. Рентгеновские, синхротронные и нейтронные исследования. 2017. Т.12. С.3-11. DOI: 10.7868/S0207352817120010 РИНЦ

Submitted:	Mar 20, 2017
Published print:	Nov 1, 2017
Published online:	Feb 27, 2018

Web of science	WOS:000426350300014
Scopus	2-s2.0-85042674051
Elibrary	35543214
AN	2018:351758