| Autor: |
Ekimov EA; Institute for High Pressure Physics, Russian Academy of Sciences, Kaluzhskoe Shosse, 14, Troitsk, 108840 Moscow, Russia., Krivobok VS; P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect, 53, 119991 Moscow, Russia., Kondrin MV; Institute for High Pressure Physics, Russian Academy of Sciences, Kaluzhskoe Shosse, 14, Troitsk, 108840 Moscow, Russia., Litvinov DA; P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect, 53, 119991 Moscow, Russia., Grigoreva LN; P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect, 53, 119991 Moscow, Russia.; Faculty of Physics, Lomonosov Moscow State University, Leninskiye Gory 1, 119991 Moscow, Russia., Koroleva AV; Faculty of Physics, Lomonosov Moscow State University, Leninskiye Gory 1, 119991 Moscow, Russia., Zazymkina DA; P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect, 53, 119991 Moscow, Russia., Khmelnitskii RA; P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect, 53, 119991 Moscow, Russia., Aminev DF; P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect, 53, 119991 Moscow, Russia., Nikolaev SN; P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect, 53, 119991 Moscow, Russia. |
| Abstrakt: |
The development of new strategies for the mass synthesis of SiC nanocrystals with high structure perfection and narrow particle size distribution remains in demand for high-tech applications. In this work, the size-controllable synthesis of the SiC 3C polytype, free of sp 2 carbon, with high structure quality nanocrystals, was realized for the first time by the pyrolysis of organosilane C 12 H 36 Si 6 at 8 GPa and temperatures up to 2000 °C. It is shown that the average particle size can be monotonically changed from ~2 nm to ~500 nm by increasing the synthesis temperature from 800 °C to 1400 °C. At higher temperatures, further enlargement of the crystals is impeded, which is consistent with the recrystallization mechanism driven by a decrease in the surface energy of the particles. The optical properties investigated by IR transmission spectroscopy, Raman scattering, and low-temperature photoluminescence provided information about the concentration and distribution of carriers in nanoparticles, as well as the dominant type of internal point defects. It is shown that changing the growth modes in combination with heat treatment enables control over not only the average crystal size, but also the LO phonon-plasmon coupled modes in the crystals, which is of interest for applications related to IR photonics. |
