| Autor: |
Eremin, S. A., Kudryashova, N. O., Leontiev, I. A., Yashnov, Y. M. |
| Zdroj: |
Inorganic Materials: Applied Research; Apr2022, Vol. 13 Issue 2, p455-459, 5p |
| Abstrakt: |
New hybrid carbon-hydrocarbon structure was found and studied after pumping a gas mixture of methane and hydrogen through a synthetic diamond powder sample with a size of 314–400 μm. The experiment was performed with a microwave plasma-chemical system for the deposition of polycrystalline diamond films. The power of the microwave generator was 3.5 kW, the consumption of hydrogen was 400 mL/min, the consumption of methane was 20 mL/min, and the pressure in the reactor chamber was 63 mmHg. The diamond powder was placed into molybdenum cups inserted into a copper holder placed on a water-cooled copper table. The gas mixture was pumped at a pressure drop of 13 mmHg. The unidirectional filament formations, some of which ended as spherical ones, were found in the space between diamond particles of the surface layer. Such a structure called "dandelion" is a composition of filamentous (with a length of 100–500 μm and a diameter of 2 μm) and spherical formations (with average diameter of 18 μm). Raman spectroscopy was used to find the features of these formations. The filamentous formation is single-crystal graphite. The surface of the spherical formation is spindle-shaped structures of nanocrystalline graphite 2 μm in length and 200 nm in thickness and nanodiamond grains with trans-polyacetylene chains [C2H2]n. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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