Aitzhanov Madi, Guseinov Nazim, Nemkayeva Renata, Sagidolda Yerulan, Tolepov Zhandos, Prikhodko Oleg, Mukhametkarimov Yerzhan
National Nanotechnological Laboratory, al-Farabi Kazakh National University, 71 Al-Farabi Ave., Almaty 050040, Kazakhstan.
Materials (Basel). 2022 Oct 12;15(20):7080. doi: 10.3390/ma15207080.
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 GaSeS flakes. Bulk GaSeS 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.
近年来，由于层状晶体液相剥离（LPE）方法的高效性和可扩展性，以及基于二维薄片的所得分散体的广泛实际应用，人们对其的兴趣不断增加。在本文中，我们对生长态和液相剥离的GaSeS薄片进行了比较研究。通过在抽空的安瓿中熔化化学计量的镓、硒和硫颗粒，合成了x~0、0.25、0.5、0.75、1的块状GaSeS晶体。X射线衍射分析表明，LPE后晶体结构变化不大，而拉曼光谱分析表明，在异丙醇中进行液相处理后，在富硒的GaSeS化合物中观察到一个与非晶硒相关的额外峰。然而，由Kubelka-Munk函数确定的LPE晶体的直接和间接跃迁能量与生长态块状GaSeS晶体的带隙相关。通过与光致发光峰位置的数据进行比较，这一发现也得到了证实。
