MoS₂ Quantum Dot-Interspersed Exfoliated MoS₂ Nanosheets

Abstract

We report the synthesis of heterodimensional nanostructures of MoS2 quantum dots interspersed in few-layered sheets of MoS2, using a liquid exfoliation technique in organic solvents. This unique hybrid morphology results from the optimized experimental conditions involving bath sonication followed by ultrasound probe sonication. We show that such heterodimensional hybrid materials could easily be extracted from the solvent as precipitates when post-treated with less polar volatile solvents such as chloroform. Such tailored MoS2 nanostructures, when directly used as electrodes for hydrogen evolution reaction, showed excellent electrocatalytic activity with low overpotential. Hence, we believe this could lead to large-scale synthesis of liquid-exfoliated layered nanostructures for their potential applications.

Facile Sonication Synthesis of WS2 Quantum Dots for Photoelectrochemical Performance

“…Zhang et al presented a combination of grinding and sonication techniques to prepare TMDC QDs from their bulk crystals [14]. Similar exfoliation in aqueous solution instead of organic solvents has also been reported [15]. However, defect-free WS2 has been difficult to obtain, and imperfections including sulfur vacancy defects and oxidized impurities may strongly affect the transport properties of the materials [16,17].…”

Ionic strength induced electrodeposition of two-dimensional layered MoS 2 nanosheets

“…On the contrary, blue-shift in A 1g peak may result from the strain experienced during the PAA-MoS 2 formation and/or stacking-induced electrodeposition process, which probably causes the surface reconstruction where weak interlayer interaction in MoS 2 can affect the intralayer bonding as well as lattice dynamics [32,33]. Moreover, it has been also shown that the frequency difference ( ) of two characteristic Raman modes increases with the thickness, which can be used to identify the MoS 2 layer number [8,32,[34][35][36]. In this context, the measured [32,36].…”

Fluorination‐Enhanced Ambient Stability and Electronic Tolerance of Black Phosphorus Quantum Dots

“…QDs derived from 2D materials, including graphene,2 graphic‐C 3 N 4 ,3 MoS 2 ,4 and phosphorene,5 display several advantages, such as photostability and low toxicity in par with the conventional organic fluorophores and semiconductor QDs 6. Given their novel optical and electronic properties, 2D material‐derived QDs have widespread applications in bioimaging,7 photodynamic therapy,8 photo‐/electrocatalysis,9 photodetection,10 and sensing 11.…”