XPS investigation of preferential sputtering of S from MoS2 and determination of MoSx stoichiometry from Mo and S peak positions

Baker, Mark; Gilmore, R.; Lenardi, Cristina; Gissler, W.

doi:10.1016/s0169-4332(99)00253-6

Cited by 383 publications

(276 citation statements)

References 21 publications

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“…3f. These binding energies are in good agreement with those reported values for MoS 2 crystal[20,21]. The atomic ratio of Mo/S is 1.0/1.91 for sample A2.…”

supporting

confidence: 91%

Synthesis of flower-like MoS2 nanosheets microspheres by hydrothermal method

Feng

Wei

Zhao

et al. 2015

J Mater Sci: Mater Electron

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In this paper, flower-like MoS 2 nanosheets microspheres were successfully synthesized by low temperature hydrothermal process using the precursors of sodium molybdate (Na 2 MoO 4 Á2H 2 O), thiourea (SC(NH 2 ) 2 ), oxalic acid (C 2 H 2 O 4 Á2H 2 O) and de-ionized water. The effects of oxalic acid concentrations and growth time on the morphology and crystallographic structure of MoS 2 nanosheets microspheres were investigated. The morphology, crystallographic structure, chemical composition of the flower-like MoS 2 nanosheets microspheres were investigated by using scanning electron microscope, X-ray diffraction, Raman spectrum, high resolution transmission electron-microscopy, and X-ray photoelectron spectroscopy, respectively. It is revealed that MoS 2 powders are composed of large, uniform flower-like microspheres, which are formed by several nanosheets gathering together perpendicular to the spherical surface. And the nanosheets are poly-crystallized hexagonal phase. The experiment results also show that the oxalic acid concentration in the precursors plays a key role on the diameter and crystalline of MoS 2 nanosheets microspheres. The formation mechanism of flower-like MoS 2 nanosheets microspheres was discussed.

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“…3f. These binding energies are in good agreement with those reported values for MoS 2 crystal[20,21]. The atomic ratio of Mo/S is 1.0/1.91 for sample A2.…”

supporting

confidence: 91%

Synthesis of flower-like MoS2 nanosheets microspheres by hydrothermal method

Feng

Wei

Zhao

et al. 2015

J Mater Sci: Mater Electron

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“…The separation energies of 3d 3/2 and 3d 5/2 was 3.10 eV, which was in good agreement with previous reports [51]. The peak at the lower binding energy of 227.12 eV corresponded to the S 2s components of molybdenite [52]. A weak peak centered at around 236.2 eV was assigned to Mo 6+ 3d 5/2 , demonstrating that the oxidation of Mo was minimal [43], which was consistent with the S 2s spectra of the molybdenite above.…”

Section: Xps Measurementsupporting

confidence: 92%

Separation of Molybdenite from Chalcopyrite in the Presence of Novel Depressant 4-Amino-3-thioxo-3,4-dihydro-1,2,4-triazin-5(2H)-one

Yin

Sun

et al. 2017

Minerals

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Abstract:In this paper, 4-amino-3-thioxo-3,4-dihydro-1,2,4-triazin-5(2H)-one (ATDT) was synthesized and introduced as a depressant for selective flotation separation of molybdenite from chalcopyrite. Its flotation performance and adsorption mechanism on minerals were first investigated by flotation, UV spectra, zeta potential, Fourier Transform Infrared Spectroscopy (FT-IR), and X-ray Photoelectron Spectroscopy Measurements (XPS). The bench scale tests indicated that ATDT exhibited stronger depressing power than chalcopyrite, and the selective index of Mo/Cu improved significantly in the presence of ATDT. The results of the UV spectra, zeta potential and FT-IR demonstrated that ATDT chemisorbed on the chalcopyrite surface. The XPS results further confirmed that ATDT might chemisorb onto the chalcopyrite surface through S and N atoms to form five-membered chelate rings and a postulated adsorption mode was presented. For molybdenite, the different measurements agreed well with each other and implied that ATDT might weakly physisorb onto a molybdenite surface.

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“…Aside from a weak carbon signal, which is generally unavoidable, no other contaminants were observed, indicating the high purity of our samples. In a previous XPS study on bulk MoS 2 , Baker et al show that the difference in binding energy between the Mo 3d 5/2 and the S 2p 3/2 peaks can be related to the stoichiometric composition of the MoS 2 [55]. All measured samples showed a E value of 67.1 eV, corresponding to a stoichiometric ratio of x = 1.9 ± 0.1.…”

Section: Resultsmentioning

confidence: 87%

Controlled synthesis of transition metal dichalcogenide thin films for electronic applications

Gatensby

McEvoy

Lee

et al. 2014

Applied Surface Science

147

126

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Please cite this article in press as: R. Gatensby, et al., Controlled synthesis of transition metal dichalcogenide thin films for electronic applications, Appl. Surf. Sci. (2014) Two dimensional transition metal dichalcogenides (TMDs) are exciting materials for future applications in nanoelectronics, nanophotonics and sensing. In particular, sulfides and selenides of molybdenum (Mo) and tungsten (W) have attracted interest as they possess a band gap, which is important for integration into electronic device structures. However, the low throughput synthesis of high quality TMD thin films has thus far hindered the development of devices, and so a scalable method is required to fully exploit their exceptional properties. Within this work a facile route to the manufacture of devices from MoS 2 and WS 2 , grown by vapour phase sulfurisation of pre-deposited metal layers, is presented. Highly homogenous TMD films are produced over large areas. Fine control over TMD film thickness, down to a few layers, is achieved by modifying the thickness of the pre-deposited metal layer. The films are characterised by Raman spectroscopy, electron microscopy and X-ray photoelectron spectroscopy. The thinnest films exhibit photoluminescence, as predicted for monolayer MoS 2 films, due to confinement in two dimensions. By using shadow mask lithography, films with well-defined geometries were produced and subsequently integrated with standard microprocessing process flows and electrically characterised. In this way, MoS 2 based sensors were produced, displaying sensitivity to NH 3 down to 400 ppb. Our device manufacture is versatile, and is adaptable for future nanoscale (opto-) electronic devices as it is reproducible, cost effective and scalable up to wafer scale.

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XPS investigation of preferential sputtering of S from MoS2 and determination of MoSx stoichiometry from Mo and S peak positions

Cited by 383 publications

References 21 publications

Synthesis of flower-like MoS2 nanosheets microspheres by hydrothermal method

Synthesis of flower-like MoS2 nanosheets microspheres by hydrothermal method

Separation of Molybdenite from Chalcopyrite in the Presence of Novel Depressant 4-Amino-3-thioxo-3,4-dihydro-1,2,4-triazin-5(2H)-one

Controlled synthesis of transition metal dichalcogenide thin films for electronic applications

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