Premium
Molecular Nanowire Bonding to Epitaxial Single‐Layer MoS 2 by an On‐Surface Ullmann Coupling Reaction
Author(s) -
RodríguezFernández Jonathan,
Haastrup Mark J.,
Schmidt Søren B.,
Grønborg Signe S.,
Mammen Mathias H. R.,
Lauritsen Jeppe V.
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201906892
Subject(s) - materials science , scanning tunneling microscope , nanowire , epitaxy , nanotechnology , molecule , layer (electronics) , heterojunction , optoelectronics , chemistry , organic chemistry
Lateral heterostructures consisting of 2D transition metal dichalcogenides (TMDCs) directly interfaced with molecular networks or nanowires can be used to construct new hybrid materials with interesting electronic and spintronic properties. However, chemical methods for selective and controllable bond formation between 2D materials and organic molecular networks need to be developed. As a demonstration of a self‐assembled organic nanowire‐TMDC system, a method to link and interconnect epitaxial single‐layer MoS 2 flakes with organic molecules is demonstrated. Whereas pristine epitaxial single‐layer MoS 2 has no affinity for molecular attachment, it is found that single‐layer MoS 2 will selectively bind the organic molecule 2,8‐dibromodibenzothiophene (DBDBT) in a surface‐assisted Ullmann coupling reaction when the MoS 2 has been activated by pre‐exposing it to hydrogen. Atom‐resolved scanning tunneling microscopy (STM) imaging is used to analyze the bonding of the nanowires, and thereby it is revealed that selective bonding takes place on a specific S atom at the corner site between the two types of zig‐zag edges available in a hexagonal single layer MoS 2 sheet. The method reported here successfully combining synthesis of epitaxial TMDCs and Ullmann coupling reactions on surfaces may open up new synthesis routes for 2D organic‐TMDC hybrid materials.