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GaSe nanosheet solutions with controlled dimensions were obtained through exfoliation followed by ultrasonic-assisted fragmentation, using water and acetone as dispersion media. Optical microscopy analysis revealed an efficient size-based separation of GaSe particles via centrifugation. AFM measurements showed that nanosheet sizes range from 50 to 130 nm. The photoluminescence spectrum of a GaSe single crystal exhibits a narrow line at 1.998 eV, characteristic of band-to-band transitions. In GaSe nanosheet solutions, this line shifts to higher energies, reaching 2.05 eV. Additionally, an extra line is observed around 2.4 eV in both solutions. The first transition is attributed to nanosheets of approximately 130 nm, while the 2.4 eV peak is associated with a reduction in nanosheet size to 60 nm.
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Cristea et al. (2025) studied this question.
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