A novel salt-assisted liquid-phase ultrasound exfoliation method in the preparation of GaSe nanosheets via Lambert-Beer obtaining rational design

Abstract

In this study, a novel Salt-assisted Liquid-phase ultrasound exfoliation (LPUE) method was proposed for the large-scale and high-efficiency preparation of GaSe nanosheets in Isopropyl alcohol (IPA). The LPUE can significantly improve the exfoliation efficiency and concentration with the assistance of salts including Sodium chloride (Nacl), Hexaammonium heptamolybdate tetrahydrate ((NH4)6Mo7O24·4H2O) and Calcium acetate (Ca(CH3COO)2·H2O). Remarkably, the Lambert-Beer law is applied for the first time in this study to obtain the concentration of GaSe by ultraviolet–visible (UV–Vis). The characterizations show that the nanoflake has been successfully exfoliated, with ∼95% of GaSe nanosheets containing 1–5 layers and 90% of the as-made GaSe nanosheets larger than 0.5 μm. The proposed LPUE method via Lambert-Beer law for precisely rational design has great potential for mass-producing GaSe nanosheets with a wide range of applications.