Synthesis of Nanoscale Fullerene C60 Filaments in the Volume of an Evaporating Drop of a Molecular Solution and Preparation of Thin Nanostructured Coatings on Their Basis
| Autor: | Urol Kudratovich Makhmanov, S. A. Bakhramov, A. M. Kokhkharov |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Fullerene Silicon Renewable Energy Sustainability and the Environment Drop (liquid) Nucleation chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Organic semiconductor Nanocrystal chemistry Chemical engineering Whisker 0103 physical sciences Nano 0210 nano-technology |
| Zdroj: | Applied Solar Energy. 55:309-314 |
| ISSN: | 1934-9424 0003-701X |
| Popis: | The features of nucleation and the mechanisms of further growth of nano- and microsized filamentary crystals (so-called whiskers) of fullerene in the volume of an isolated evaporating drop of a C60 molecular solution in ortho-xylene on a smooth surface of silicon and glass substrates have been studied for the first time. The morphological features and the exact dimensional characteristics of nanostructured mC60 fullerene filamentary crystals (where m is the number of spherical C60 macromolecules in the synthesized whisker) that are promising for the creation of nano- and micro-dimensional photoelectric converters in solar energy were determined by high-resolution scanning electron microscopy. When a drop of a molecular solution of C60 in ortho-xylene is transferred onto the surface of an optically smooth glass substrate, filamentary crystalline structures (nanowhiskers) with sizes of ∼250–700 nm in length and ∼50 nm wide were synthesized in the process of natural thermal evaporation of an organic solvent at room temperature (T ≈ 25°С). In this case, the surface of the resulting mC60 nanowhiskers is molecularly smooth, and the roughness does not exceed ∼5 nm. It has been found that at a temperature of silicon substrate T ≈ 35°С, not only the nucleation and growth of crystalline structures of filamentary nanocrystals in a volume of evaporating drop of C60 solution are accelerated, but there is also a significant (more than two orders of magnitude) increase in the final geometric dimensions of the synthesized whiskers. The ratio of the length (L ≈ 80 μm) to width (D ≈ 7.0 μm) of the filamentary crystals is approximately 11 : 1. A nanostructured organic semiconductor coating with a thickness of 10 μm, consisting of closely spaced mC60 filamentary crystals and a molecular layer of fullerene C60 on the smooth surface of a plane silicon substrate has been obtained for the first time. |
| Databáze: | OpenAIRE |
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