Modification of the optoelectronic properties of two-dimensional MoS2 crystals by ultraviolet-ozone treatment

Yang, Hae In; Park, Seonyoung; Choi, Woong

doi:10.1016/j.apsusc.2018.02.256

Cited by 24 publications

(26 citation statements)

References 25 publications

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“…Its existence was reported in polycrystalline multilayer MoS 2 thin films after O 2 plasma treatment [28]. However, it was not observed in other polycrystalline multilayer MoS 2 thin films [26, 29] or single crystals [9, 16, 30] after O 2 plasma or UV-O 3 treatment. While this inconsistency may be related to dose- and time-dependence of MoS 2 oxidation [30], more systematic investigation is needed to clarify this in the future.…”

Section: Resultsmentioning

confidence: 99%

“…To overcome these difficulties, surface functionalization of TMDs by O 2 plasma [7, 8] or ultraviolet-ozone (UV-O 3 ) [9–11] has been suggested. While these methods can functionalize the surface of MoS 2 by surface oxidation, they can simultaneously influence the structure and properties of monolayer MoS 2 [12–16]. For example, oxidation by O 2 plasma or UV-O 3 treatment altered the Raman vibration modes and photoluminescence (PL) emission of monolayer MoS 2 [12, 16].…”

Section: Introductionmentioning

confidence: 99%

“…While these methods can functionalize the surface of MoS 2 by surface oxidation, they can simultaneously influence the structure and properties of monolayer MoS 2 [12–16]. For example, oxidation by O 2 plasma or UV-O 3 treatment altered the Raman vibration modes and photoluminescence (PL) emission of monolayer MoS 2 [12, 16]. However, as most studies were based on micrometer-scale monolayer MoS 2 flakes obtained by mechanical exfoliation from bulk single crystals, little has been known on their interaction with large-area monolayer MoS 2 thin films, which are typically polycrystalline.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ultraviolet-Ozone Treatment on MoS2 Monolayers: Comparison of Chemical-Vapor-Deposited Polycrystalline Thin Films and Mechanically Exfoliated Single Crystal Flakes

2019

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We report the different oxidation behavior between polycrystalline chemical-vapor-deposited and mechanically exfoliated single crystal MoS 2 monolayers by ultraviolet-ozone treatment. As ultraviolet-ozone treatment time increased from 0 to 5 min, photoluminescence emission and Raman modes of both MoS 2 disappeared, suggesting structural degradation by oxidation. Analysis with optical absorbance and X-ray photoelectron spectroscopy suggested the formation of MoO 3 in both MoS 2 after ultraviolet-ozone treatment. In addition, ultraviolet-ozone treatment possibly led to the formation of oxygen vacancies, molybdenum oxysulfide, or molybdenum sulfates in chemical-vapor-deposited MoS 2 . The measurement of electrical resistance after ultraviolet-ozone treatment suggested the transformation of chemical-vapor-deposited MoS 2 into doped MoO 3 and of mechanically exfoliated MoS 2 into negligibly doped MoO 3 . These results demonstrate that the crystallinity of monolayer MoS 2 can strongly influence the effect of ultraviolet-ozone treatment, providing important implications on the device integration of MoS 2 and other two-dimensional semiconductors. Electronic supplementary material The online version of this article (10.1186/s11671-019-3119-3) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Ultraviolet-Ozone Treatment on MoS2 Monolayers: Comparison of Chemical-Vapor-Deposited Polycrystalline Thin Films and Mechanically Exfoliated Single Crystal Flakes

2019

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“…In the case of the O 1s spectra shown in Figure S8b, the peak of O 1s in MoS 2 is located at 532.3 eV under 1 min of UV/Ozone exposure, indicating the adsorbed oxygen on the MoS 2 surface. 43,44 Figure 5c shows the evolution of Raman spectra of MoS 2 aging under UV/Ozone exposure for 1, 5, 10, 15, and 30 min. The peak intensities of 1 E 2g and A 1g decrease with the increase in exposure time (Figure 5c).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Impact of the Surface and Microstructure on the Lubricative Properties of MoS₂ Aging under Different Environments

Cao

Lang

et al. 2021

Langmuir

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Molybdenum disulfide (MoS2) with a hydrophobic property and layered structure possesses an excellent lubricative property and has been widely used as a lubricant in various areas, including satellites, aircraft, and new energy vehicles. Aging is a ubiquitous phenomenon in MoS2 and plays a key role in its tribological application for shortening its service life. The effect of the surface and microstructure on the lubricative properties of MoS2 aging under different environments, including deionized water (DI water), ultraviolet/ozone (UV/Ozone), and high-temperature, was investigated. First, the lubrication of MoS2 transiently degrades because of physical adsorption and recovers after mechanical removal. The lubrication of MoS2 also degrades slightly when its surface becomes hydrophilic, thereby enhancing the adhesion energy due to atomic oxygen interaction under UV/Ozone exposure. Second, the lubrication of MoS2 degrades irreversibly because of the formation of stripes with the destroyed structures under accelerated aging. The lubrication of MoS2 further degrades with the formation of small triangular pits under high-temperature annealing. Finally, the lubrication of MoS2 deteriorates due to the destroyed structure and complete oxidation. The severe aging of MoS2 is accompanied with large triangular pits due to anisotropic oxidation etching of MoS2. The lubrication failure of MoS2 was determined on the basis of structural defect formation and surface property degradation induced by the extent of oxygen diffusion. The enhanced out-of-plane deformation due to the reduced out-of-plane stiffness and the increased energy barriers of defects are fundamentally responsible for the lubrication degradation of MoS2 at the atomic scale. These findings can provide new insights into the atomic-scale mechanism underlying the lubrication failure of MoS2 and pave the way for the realization of MoS2-based lubrication application under various environments.

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“…During cleaning, surface organic compounds decompose to volatile substances by ultraviolet lights and by strong oxidation of ozone. The technique has been employed to irradiate 2D MoS 2 mono-layers [163,164] and few-layers [109,[165][166][167].…”

Section: Hybrid Irradiation: Uv-ozone Treatmentsmentioning

confidence: 99%

Recent Progress on Irradiation-Induced Defect Engineering of Two-Dimensional 2H-MoS2 Few Layers

et al. 2019

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Atom-thick two-dimensional materials usually possess unique properties compared to their bulk counterparts. Their properties are significantly affected by defects, which could be uncontrollably introduced by irradiation. The effects of electromagnetic irradiation and particle irradiation on 2H MoS 2 two-dimensional nanolayers are reviewed in this paper, covering heavy ions, protons, electrons, gamma rays, X-rays, ultraviolet light, terahertz, and infrared irradiation. Various defects in MoS 2 layers were created by the defect engineering. Here we focus on their influence on the structural, electronic, catalytic, and magnetic performance of the 2D materials. Additionally, irradiation-induced doping is discussed and involved.

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Modification of the optoelectronic properties of two-dimensional MoS2 crystals by ultraviolet-ozone treatment

Cited by 24 publications

References 25 publications

Effect of Ultraviolet-Ozone Treatment on MoS2 Monolayers: Comparison of Chemical-Vapor-Deposited Polycrystalline Thin Films and Mechanically Exfoliated Single Crystal Flakes

Effect of Ultraviolet-Ozone Treatment on MoS2 Monolayers: Comparison of Chemical-Vapor-Deposited Polycrystalline Thin Films and Mechanically Exfoliated Single Crystal Flakes

Impact of the Surface and Microstructure on the Lubricative Properties of MoS₂ Aging under Different Environments

Recent Progress on Irradiation-Induced Defect Engineering of Two-Dimensional 2H-MoS2 Few Layers

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Modification of the optoelectronic properties of two-dimensional MoS2 crystals by ultraviolet-ozone treatment

Cited by 24 publications

References 25 publications

Effect of Ultraviolet-Ozone Treatment on MoS2 Monolayers: Comparison of Chemical-Vapor-Deposited Polycrystalline Thin Films and Mechanically Exfoliated Single Crystal Flakes

Effect of Ultraviolet-Ozone Treatment on MoS2 Monolayers: Comparison of Chemical-Vapor-Deposited Polycrystalline Thin Films and Mechanically Exfoliated Single Crystal Flakes

Impact of the Surface and Microstructure on the Lubricative Properties of MoS2 Aging under Different Environments

Recent Progress on Irradiation-Induced Defect Engineering of Two-Dimensional 2H-MoS2 Few Layers

Contact Info

Product

Resources

About

Impact of the Surface and Microstructure on the Lubricative Properties of MoS₂ Aging under Different Environments