title: Functionalization of liquid-exfoliated two-dimensional 2H-MoS2.
abstract: Layered two-dimensional (2D) inorganic transition-metal dichalchogenides (TMDs) have attracted great interest as a result of their potential application in optoelectronics, catalysis, and medicine. However, methods to functionalize and process such 2D TMDs remain scarce. We have established a facile route towards functionalized layered MoS2 . We found that the reaction of liquid-exfoliated 2D MoS2 , with M(OAc)2 salts (M=Ni, Cu, Zn; OAc=acetate) yielded functionalized MoS2 -M(OAc)2 materials. Importantly, this method furnished the 2H-polytype of MoS2 which is a semiconductor. X-ray photoelectron spectroscopy (XPS), diffuse reflectance infrared Fourier transform spectroscopy (DRIFT-IR), and thermogravimetric analysis (TGA) provide strong evidence for the coordination of MoS2 surface sulfur atoms to the M(OAc)2 salt. Interestingly, functionalization of 2H-MoS2 allows for its dispersion/processing in more conventional laboratory solvents.
authors.affiliation: CRANN/AMBER Nanoscience Institute, Trinity College Dublin (TCD), College Green, Dublin 2 (Ireland); School of Physics, TCD.
authors.forename: Claudia
authors.initials: C
authors.lastname: Backes
authors.forename: Nina C
authors.initials: NC
authors.lastname: Berner
authors.forename: Xin
authors.initials: X
authors.lastname: Chen
authors.forename: Paul
authors.initials: P
authors.lastname: Lafargue
authors.forename: Pierre
authors.initials: P
authors.lastname: LaPlace
authors.forename: Mark
authors.initials: M
authors.lastname: Freeley
authors.forename: Georg S
authors.initials: GS
authors.lastname: Duesberg
authors.forename: Jonathan N
authors.initials: JN
authors.lastname: Coleman
authors.forename: Aidan R
authors.initials: AR
authors.lastname: McDonald
mesh_terms: D000085:Acetates / Q000737:chemistry; D003903:Deuterium / Q000737:chemistry*; D004220:Disulfides / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry; D008982:Molybdenum / Q000737:chemistry*
chemical_list: D000085:Acetates; D004220:Disulfides; D019216:Metals, Heavy; D008982:Molybdenum; D003903:Deuterium; C082964:molybdenum disulfide
keywords: 2D materials; carboxylate ligands; liquid exfoliation; surface functionalization; transition-metal dichalcogenides