Fabrication of transition metal dichalcogenides quantum dots based on femtosecond laser ablation

Abstract As heavy metal-free quantum dots, transition metal dichalcogenides (TMDs) and boron nitride (BN) quantum dots (QDs) have aroused great interest due to features such as good thermal conductivity, chemical stability, and unique optical properties. Although TMDs have been synthesized using different methods, most of these methods require time-consuming or complex steps, limiting the applications of TMDs. We propose a fast and simple method for the synthesis of high-quality molybdenum disulfide (MoS 2 ) QDs and tungsten disulfide (WS 2 ) QDs based on femtosecond laser ablation and sonication-assisted liquid exfoliation. The prepared MoS 2 QDs and WS 2 QDs were characterized by transmission electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The resulting products…