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Oxidation and phase transition in covalently functionalized MoS2

Narine Moses Badlyan Orcid Logo, Nina Pettinger Orcid Logo, Niklas Enderlein Orcid Logo, Roland Gillen Orcid Logo, Xin Chen Orcid Logo, Wanzheng Zhang, Kathrin C. Knirsch, Andreas Hirsch Orcid Logo, Janina Maultzsch Orcid Logo

Physical Review B, Volume: 106, Issue: 10

Swansea University Author: Roland Gillen Orcid Logo

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DOI (Published version): 10.1103/physrevb.106.104103

Abstract

We present a Raman study of MoS2 powders and MoS2 individual layers covalently functionalized with organic molecules. In MoS2 powders, the defect-induced “LA” Raman mode shows evidence for successful functionalization. Increasing temperature induces oxidation of both functionalized and nonfunctional...

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Published in: Physical Review B
ISSN: 2469-9950 2469-9969
Published: American Physical Society (APS) 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa66649
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Abstract: We present a Raman study of MoS2 powders and MoS2 individual layers covalently functionalized with organic molecules. In MoS2 powders, the defect-induced “LA” Raman mode shows evidence for successful functionalization. Increasing temperature induces oxidation of both functionalized and nonfunctionalized MoS2 into MoO3. In contrast, mechanically exfoliated individual MoS2 layers do not transfer into MoO3 under the same conditions. Instead, the Raman spectra show that the procedure of covalent functionalization leads to a partial transition from the 2H into the 1T' crystallographic phase in few-layer MoS2. We support the identification of the 1T' phase by DFT calculations of the corresponding vibrational modes in the mono- and bilayer 1T'-MoS2.
College: Faculty of Science and Engineering
Funders: This work was partly funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)– Project No. 447264071– through the SFB 953 “Synthetic Carbon Allotropes”– B13 and A1 and has received funding from the European Union’s Horizon 2020 research and innovation programme Graphene Flagship under Grant Agreement No. 881603.
Issue: 10

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