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Моделирование структуры одномерного кристалла CoI2 во внутреннем канале ОСНТстатья
- Авторы: Кумсков А.С., Жигалина В.Г., Закалюкин Р.М., Васильев А.Л., Елисеев А.А., Крестинин А.В.
- Журнал: Наукоемкие технологии
- Том: 12
- Номер: 7
- Год издания: 2011
- Издательство: Издательство "Радиотехника"
- Местоположение издательства: Москва
- Первая страница: 21
- Последняя страница: 24
- Аннотация: Методом просвечивающей электронной микроскопии была исследована структура нанокомпозита, состоящего из квазиодномерного кристалла CoI, выращенного во внутреннем канале одностенной углеродной нанотрубки (ОСНТ). Согласно предлагаемым моделям и расчетным изображениям на их основе, кристаллографическое направление в трехмерном кристалле совпадает с осью канала ОСНТ. Основной контраст на изображениях нанокомпозита дают атомы йода.2Nanoсomposites one-dimensional crystal in single-walled carbon nanotube (1Dcrystal@SWNT) are of both theoretical and applied interest. Crystallization occurs in the space limited by channel walls diameter of 1,0 - 1,2 nm. Therefore the crystal can be considered as quasi one-dimensional, and its structure can differ from 3D crystal structure. Structural investigations of quasi one-dimensional crystal CoI2@SWNT allowed to reveal a difference between anionic iodide sub lattice in nanocomposite and anionic sub lattice of a corresponding massive material, and also to identify positions of statistically distributed cobalt atoms. SWNT were obtained by catalytic electroarc synthesis using graphite cores in diameter 0,8 sm and Y/Ni powder as a catalyst. Filling was occurred by a capillary method ex-situ. The obtained 1DCoI2@SWNT nanocomposite was investigated by HREM method with microscope Titan 80 - 300 at accelerating voltage 80 kV. Calculated nanocomposite images considered nanotube structure and were made for tubes with (17,0) indexes. The atomic nanocomposite model was suggested. It was based on three-dimensional trigonal CoI2 structure with lattice parameters а = 0,397 nm, с = 0,666 nm. A crystallographic direction coincided with a SWNT channel axis. Lengthening of one-dimensional crystal in a direction on 12 - 16 % in comparison with 3D structure was observed. According to the offered model iodine formed the packing similar to close-packed hexagonal, cobalt anions could be located in octahedral and tetrahedral voids. The calculated images of 1DCoI2@SWNT nanocomposite structure, well corresponding to TEM images, were obtained.
- Добавил в систему: Елисеев Андрей Анатольевич