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Engineering 2D Materials from Single-Layer NbS2

delete2024-11-25
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OA
AI
T
Timo Knispel
D
Daniela Mohrenstecher
C
Carsten Speckmann
A
Affan Safeer
C
Camiel van Efferen
V
Virgínia Boix
G
Grueneis, Alexander
W
Wouter Jolie
A
Alexei Preobrajenski
J
Jan Knudsen
N
Nicolae Atodiresei
T
Thomas Michely
J
J. Fischer *
DOI：10.1002/smll.202408044delete
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Abstract

Abstract

En 中文
Starting from a single layer of NbS2 grown on graphene by molecular beam epitaxy, the single unit cell thick 2D materials Nb5/3S3-2D and Nb2S3-2D are created using two different pathways. Either annealing under sulfur-deficient conditions at progressively higher temperatures or deposition of increasing amounts of Nb at elevated temperature result in phase-pure Nb5/3S3-2D followed by Nb2S3-2D. The materials are characterized by scanning tunneling microscopy, scanning tunneling spectroscopy, and X-ray photoemission spectroscopy. The experimental assessment combined with systematic density functional theory calculations reveals their structure. The 2D materials are covalently bound without any van der Waals gap. Their stacking sequence and structure are at variance with expectations based on corresponding bulk materials highlighting the importance of surface and interface effects in structure formation.
Keywords:
covalent transformation
molecular beam-epitaxy
niobium disulfide
single layer

Journal

Small cover
Small
IF:
12.1
Papers:
3.0W
Citations:
16.4W

Organization

U
University of Cologne
Scholars:
3.0W
Papers: 2.1W
Citations: 2.4W
L
lund university
Scholars:
4.1W
Papers: 3.9W
Citations: 54
H
Helmholtz Association
Scholars:
13.2W
Papers: 10.7W
Citations: 145
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