Functionalization of Liquid-Exfoliated Two-Dimensional 2H-MoS sub(2)

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...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2015-02, Vol.54 (9), p.2638-2642
Main Authors: Backes, Claudia, Berner, Nina C, Chen, Xin, Lafargue, Paul, LaPlace, Pierre, Freeley, Mark, Duesberg, Georg S, Coleman, Jonathan N, McDonald, Aidan R
Format: Article
Language:English
Subjects:
Atomic beam spectroscopy
Diffusion
Molybdenum disulfide
Photoelectron spectroscopy
Semiconductors
Sulfur
Two dimensional
X-ray photoelectron spectroscopy
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Summary: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 MoS sub(2). We found that the reaction of liquid-exfoliated 2DMoS sub(2), with M(OAc) sub(2) salts (M=Ni, Cu, Zn; OAc=acetate) yielded functionalized MoS sub(2)-M(OAc) sub(2) materials. Importantly, this method furnished the 2H-polytype of MoS sub(2) 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 MoS sub(2) surface sulfur atoms to the M(OAc) sub(2) salt. Interestingly, functionalization of 2H-MoS sub(2) allows for its dispersion/processing in more conventional laboratory solvents. Surface modification: Functionalization of liquid-exfoliated, defect-free, layered 2H-MoS sub(2) was achieved through coordination of metal carboxylate salts by basal-plane sulfur atoms. The surface-coordinated metal center acts as an anchor for ligating organic functionalities. X-ray photoelectron spectroscopy (XPS) provides strong evidence for the coordination of MoS sub(2) surface sulfur atoms to the M(OAc) sub(2) salt (see picture).
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201409412