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. 2023 May 3;8(19):16579-16586.
doi: 10.1021/acsomega.2c06794. eCollection 2023 May 16.

Stabilization of the Nano-Sized 1T Phase through Rhenium Doping in the Metal-Organic CVD MoS2 Films

Roman I Romanov  1 , Ivan V Zabrosaev  1 , Maxim G Kozodaev  1 , Dmitry I Yakubovsky  2 , Mikhail K Tatmyshevskiy  2 , Aleksey A Timofeev  3 , Natalia V Doroshina  2 , Sergey M Novikov  2 , Valentyn S Volkov  2 , Andrey M Markeev  1
Affiliations

Stabilization of the Nano-Sized 1T Phase through Rhenium Doping in the Metal-Organic CVD MoS2 Films

Roman I Romanov et al. ACS Omega. .

Abstract

Heterogeneous nanostructures composed of metastable tetragonal 1T-MoS2 and stable hexagonal 2H-MoS2 phases are highly promising for a wide range of applications, including catalysis and ion batteries, due to the high electrical conductivity and catalytic activity of the 1T phase. However, a controllable synthesis of stabilized 1T-MoS2 films over the wafer-scale area is challenging. In this work, a metal-organic chemical vapor deposition process allowing us to obtain ultrathin MoS2 films containing both 1T and 2H phases and control their ratio through rhenium doping was suggested. As a result, Mo1-xRexS2 films with a 1T-MoS2 fraction up to ≈30% were obtained, which were relatively stable under normal conditions for a long time. X-ray photoelectron spectroscopy and Raman spectroscopy also indicated that the 1T-MoS2 phase fraction increased with rhenium concentration increase saturating at Re concentrations above 5 at. %. Also, its concentration was found to significantly affect the film resistivity. Thus, the resistivity of the film containing approximately 30% of the 1T phase was about 130 times lower than that of the film without the 1T phase.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
AFM image of Mo2.5-4 (a) and Mo2.5-4-Re (b) films.
Figure 2
Figure 2
Plan-view high-resolution TEM images of the Mo2.1-4 film.
Figure 3
Figure 3
XPS core-level Mo3d spectra of grown Mo 1–xRexS2 films: Mo1.5-6 (a), Mo1.5-6-Re (b), Mo2.5-4-Re (c), and Mo4.1-2-Re (d).
Figure 4
Figure 4
XPS core-level S2p spectra of grown Mo 1–xRexS2 films: Mo1.5-6 (a), Mo1.5-6-Re (b), Mo2.5-4-Re (c), and Mo4.1-2-Re (d).
Figure 5
Figure 5
XPS core-level Re4f spectra of grown Mo 1–xRexS2 films: Mo1.5-6 (a), Mo1.5-6-Re (b), Mo2.5-4-Re (c), and Mo4.1-2-Re (d).
Figure 6
Figure 6
Raman spectra of MoS2 (a) and Mo 1–xRexS2 (b).
Figure 7
Figure 7
Photoluminescence spectra of Mo1.5-6, Mo2.5-4, and Mo1.5-6-Re films.
Figure 8
Figure 8
Resistivity dependence on the I(E1g)/I(A1g) Raman peak ratio, corresponding to the 1T phase fraction.
See this image and copyright information in PMC

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