Formation of Silicon Nanocrystals under Friction

It is found using triboluminescence (TL) that nanocrystals of silicon (ncSi) with linear dimensions of about 4 nm are formed from a single crystal of silicon (Si) under friction. The time dependence of the intensity of TL signals is investigated. It consists of many superimposed signals. An analysis...

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Bibliographic Details
Published in:Physics of the solid state 2020-07, Vol.62 (7), p.1210-1213
Main Authors: Vettegren’, V. I., Mamalimov, R. I., Shcherbakov, I. P., Kulik, V. B.
Format: Article
Language:English
Subjects:
Friction
Mechanical Properties
Microcracks
Nanocrystals
Photoluminescence
Physics
Physics and Astronomy
Physics of Strength
Plasticity
Powders
Raman spectroscopy
Silicon
Single crystals
Solid State Physics
Spectrum analysis
Time dependence
Triboluminescence
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Summary:It is found using triboluminescence (TL) that nanocrystals of silicon (ncSi) with linear dimensions of about 4 nm are formed from a single crystal of silicon (Si) under friction. The time dependence of the intensity of TL signals is investigated. It consists of many superimposed signals. An analysis of their dynamics shows that nanocrystals are located on the microcrack faces formed during fracture. At the same time, a powder flies out of the friction region. Using the photoluminescence (PL) and Raman spectroscopy methods, the size of silicon nanocrystals in the powder was determined. It is about 2.2 nm. Probably, microcracks grow further in the time interval between friction and recording the Raman and PL spectra (several hours), which leads to an approximately twofold decrease in the size of nanocrystals.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783420070276