Highly concentrated and stabilizer-free transition-metal dichalcogenide dispersions in low-boiling point solvent for flexible electronics

Abstract

Liquid-phase exfoliation of TMDCs was studied in a low-boiling point solvent, and the highest concentration of dispersions without surfactants was achieved.

Sonochemical edge functionalisation of molybdenum disulfide

“…Hansen matching (smaller interaction radius) and higher viscosity 41 . Chemical characterisation (XPS) and microscopy (HRTEM and AFM micrographs) in that work 40 does not indicate the presence of molybdenum oxides. It is observed that the zeta potential for nanosheets exfoliated in acetone is significantly higher than for those reported in 2-butanone.…”

“…Hansen parameters for 2-butanone 7 , a linear ketone containing one extra carbon than acetone, are 16.0, 9.0 and 5.1 MPa 1/2 , for dispersive, polar and hydrogen bonding components, respectively. Highly concentrated dispersions of TMDs in 2-butanone using bath sonication was obtained by Lobo et al 40 . A similar degree of exfoliation was obtained by them, as indicated by peak separation of the in-plane and out-of-plane Raman modes for MoS2 (24.2 cm -1 for acetone and 24.9 cm -1 for 2-butanone).…”

Exfoliation in a low boiling point solvent and electrochemical applications of MoO3

“…It has been theoretically reported that apart from the matching of HSP values, factors such as the structure of the solvent, its bulkiness and its re-orientation on the exfoliated nanosheets are other critical parameters to be considered for efficient exfoliation [15,16]. These theoretical studies were also supplemented with experimental observations where it was demonstrated that the simple addition of a -CH 2 group to a solvent drastically changes the efficiency of the LPE process [17][18][19]. It is also reported that the exfoliation efficiency of layered materials may differ depending on the bulk precursor.…”

Advances in Liquid‐Phase and Intercalation Exfoliations of Transition Metal Dichalcogenides to Produce 2D Framework

“…[183,184] Many researchers focused on using additives and surfactants in water and low-boiling solvents to stabilize nanosheets. [185][186][187][188] As long as it is able to match the surface tensions of both the liquid phase and the nanosheet faces within the solid-liquid interface to promote colloidal dispersion, the surfactant type does not appear to be excessively important. [181,189] Growth of surfactant aided exfoliation has to gain lots of attention as a broad exploration of an assortment of surfactants which serves as additives for the stabilization or equilibrium of nanosheets.…”