Type

Journal Article

Authors

Claudia Backes
Jonathan N Coleman
Andreas Hirsch
Frank Hauke
Valeria Nicolosi
Georg S Duesberg
Stefano Sanvito
Marcus Halik
Philipp Vecera
Irena Abramovic
and 8 others

Subjects

Chemistry

Topics
salts surface properties covalent bonds basal molybdenum lithium intercalation functionalization two dimensional dft calculations transition metal diazonium

Basal-Plane Functionalization of Chemically Exfoliated Molybdenum Disulfide by Diazonium Salts. (2015)

Abstract Although transition metal dichalcogenides such as MoS2 have been recognized as highly potent two-dimensional nanomaterials, general methods to chemically functionalize them are scarce. Herein, we demonstrate a functionalization route that results in organic groups bonded to the MoS2 surface via covalent C-S bonds. This is based on lithium intercalation, chemical exfoliation and subsequent quenching of the negative charges residing on the MoS2 by electrophiles such as diazonium salts. Typical degrees of functionalization are 10-20 atom % and are potentially tunable by the choice of intercalation conditions. Significantly, no further defects are introduced, and annealing at 350 °C restores the pristine 2H-MoS2. We show that, unlike both chemically exfoliated and pristine MoS2, the functionalized MoS2 is very well dispersible in anisole, confirming a significant modification of the surface properties by functionalization. DFT calculations show that the grafting of the functional group to the sulfur atoms of (charged) MoS2 is energetically favorable and that S-C bonds are formed.
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Full list of authors on original publication

Claudia Backes, Jonathan N Coleman, Andreas Hirsch, Frank Hauke, Valeria Nicolosi, Georg S Duesberg, Stefano Sanvito, Marcus Halik, Philipp Vecera, Irena Abramovic and 8 others

Experts in our system

1
Claudia Backes
Trinity College Dublin
Total Publications: 20
 
2
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
3
Frank Hauke
Trinity College Dublin
Total Publications: 4
 
4
Valeria Nicolosi
Trinity College Dublin
Total Publications: 67
 
5
Georg Duesberg
Trinity College Dublin
Total Publications: 116
 
6
Stefano Sanvito
Trinity College Dublin
Total Publications: 182