Cluster-Type Structure of Amorphous Smooth Hydrocarbon CDx Films (x ~ 0.5) from T-10 Tokamak
Научная публикация
| Общая информация |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Переводная
|
| Журнал |
Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques
ISSN: 1027-4510
, E-ISSN: 1819-7094
|
| Вых. Данные |
Год: 2017,
Том: 11,
Номер: 6,
Страницы: 1208-1215
Страниц
: 8
DOI:
10.1134/s1027451017060349
|
| Ключевые слова |
amorphous carbon films; carbon network; fractal (self-affine) structure; neutron diffraction; small angle X-ray scattering; wide angle X-ray scattering |
| Авторы |
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
|
| Организации |
| 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.