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Direct Imaging of Dopant and Impurity Distributions in 2D MoS 2
Author(s) -
Kim SeHo,
Lim Joohyun,
Sahu Rajib,
Kasian Olga,
Stephenson Leigh T.,
Scheu Christina,
Gault Baptiste
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201907235
Subject(s) - materials science , dopant , molybdenum disulfide , impurity , doping , nanosheet , atom probe , molybdenum , nanotechnology , transition metal , sulfur , catalysis , atom (system on chip) , chemical engineering , chemical physics , optoelectronics , metallurgy , organic chemistry , chemistry , transmission electron microscopy , computer science , engineering , embedded system , physics
Molybdenum disulfide (MoS 2 ) nanosheet is a two‐dimensional (2D) material with high electron mobility and with high potential for applications in catalysis and electronics. MoS 2 nanosheets are synthesized using a one‐pot wet‐chemical synthesis route with and without Re doping. Atom probe tomography reveals that 3.8 at% Re is homogeneously distributed within the Re‐doped sheets. Other impurities are also found integrated within the material: light elements including C, N, O, and Na, locally enriched up to 0.1 at%, as well as heavy elements such as V and W. Analysis of the nondoped sample reveals that the W and V likely originate from the Mo precursor. It is shown how wet‐chemical synthesis results in an uncontrolled integration of species from the solution that can affect the material's activity. The results of this work are expected to contribute to an improved understanding of the relationships linking composition to properties of 2D transition‐metal dichalcogenide materials.