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Keywords = layered gallium selenide/sulfide crystals

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13 pages, 5355 KB  
Article
Growth and Liquid-Phase Exfoliation of GaSe1−xSx Crystals
by Madi Aitzhanov, Nazim Guseinov, Renata Nemkayeva, Yerulan Sagidolda, Zhandos Tolepov, Oleg Prikhodko and Yerzhan Mukhametkarimov
Materials 2022, 15(20), 7080; https://doi.org/10.3390/ma15207080 - 12 Oct 2022
Cited by 8 | Viewed by 2629
Abstract
In recent years, interest in the liquid-phase exfoliation (LPE) of layered crystals has been growing due to the efficiency and scalability of the method, as well as the wide range of practical applications of the obtained dispersions based on two-dimensional flakes. In this [...] Read more.
In recent years, interest in the liquid-phase exfoliation (LPE) of layered crystals has been growing due to the efficiency and scalability of the method, as well as the wide range of practical applications of the obtained dispersions based on two-dimensional flakes. In this paper, we present a comparative study of as-grown and liquid-phase exfoliated GaSe1−xSx flakes. Bulk GaSe1−xSx crystals with x ~ 0, 0.25, 0.5, 0.75, 1 were synthesized by melting stoichiometric amounts of gallium, selenium, and sulfur particles in evacuated ampoules. X-ray diffraction analysis showed that the crystal structure does not change considerably after LPE, while the analysis of the Raman spectra revealed that, after liquid-phase processing in IPA, an additional peak associated with amorphous selenium is observed in selenium-rich GaSeS compounds. Nevertheless, the direct and indirect transition energies determined from the Kubelka-Munk function for LPE crystals correlate with the band gap of the as-grown bulk GaSeS crystals. This finding is also confirmed by comparison with the data on the positions of the photoluminescence peak. Full article
(This article belongs to the Topic Advances and Applications of 2D Materials, 2nd Volume)
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