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Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS 2.

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Title: Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS 2.
Authors: Sarcan, Fahrettin1,2 (AUTHOR) alex.armstrong@york.ac.uk, Armstrong, Alex J.1 (AUTHOR) keith.mckenna@york.ac.uk, Bostan, Yusuf K.2,3 (AUTHOR) esraakus2021@gmail.com, Kus, Esra2 (AUTHOR) ayseerol@istanbul.edu.tr, McKenna, Keith P.1 (AUTHOR), Erol, Ayse2 (AUTHOR), Wang, Yue1 (AUTHOR) fahrettin.sarcan@istanbul.edu.tr
Source: Nanomaterials (2079-4991). Dec2023, Vol. 13 Issue 23, p3034. 11p.
Subjects: Radiation sterilization, Optical properties, Surface cleaning, Density functional theory, Electron density, Molybdenum disulfide
Abstract: Ultraviolet-ozone (UV-O3) treatment is a simple but effective technique for surface cleaning, surface sterilization, doping, and oxidation, and is applicable to a wide range of materials. In this study, we investigated how UV-O3 treatment affects the optical and electrical properties of molybdenum disulfide (MoS2), with and without the presence of a dielectric substrate. We performed detailed photoluminescence (PL) measurements on 1–7 layers of MoS2 with up to 8 min of UV-O3 exposure. Density functional theory (DFT) calculations were carried out to provide insight into oxygen-MoS2 interaction mechanisms. Our results showed that the influence of UV-O3 treatment on PL depends on whether the substrate is present, as well as the number of layers. Additionally, 4 min of UV-O3 treatment was found to be optimal to produce p-type MoS2, while maintaining above 80% of the PL intensity and the emission wavelength, compared to pristine flakes (intrinsically n-type). UV-O3 treatment for more than 6 min not only caused a reduction in the electron density but also deteriorated the hole-dominated transport. It is revealed that the substrate plays a critical role in the manipulation of the electrical and optical properties of MoS2, which should be considered in future device fabrication and applications. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS 2.
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  Data: <searchLink fieldCode="AR" term="%22Sarcan%2C+Fahrettin%22">Sarcan, Fahrettin</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> alex.armstrong@york.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Armstrong%2C+Alex+J%2E%22">Armstrong, Alex J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> keith.mckenna@york.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Bostan%2C+Yusuf+K%2E%22">Bostan, Yusuf K.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<i> esraakus2021@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Kus%2C+Esra%22">Kus, Esra</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> ayseerol@istanbul.edu.tr</i><br /><searchLink fieldCode="AR" term="%22McKenna%2C+Keith+P%2E%22">McKenna, Keith P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Erol%2C+Ayse%22">Erol, Ayse</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Yue%22">Wang, Yue</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> fahrettin.sarcan@istanbul.edu.tr</i>
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Dec2023, Vol. 13 Issue 23, p3034. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Radiation+sterilization%22">Radiation sterilization</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+properties%22">Optical properties</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+cleaning%22">Surface cleaning</searchLink><br /><searchLink fieldCode="DE" term="%22Density+functional+theory%22">Density functional theory</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+density%22">Electron density</searchLink><br /><searchLink fieldCode="DE" term="%22Molybdenum+disulfide%22">Molybdenum disulfide</searchLink>
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  Label: Abstract
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  Data: Ultraviolet-ozone (UV-O3) treatment is a simple but effective technique for surface cleaning, surface sterilization, doping, and oxidation, and is applicable to a wide range of materials. In this study, we investigated how UV-O3 treatment affects the optical and electrical properties of molybdenum disulfide (MoS2), with and without the presence of a dielectric substrate. We performed detailed photoluminescence (PL) measurements on 1–7 layers of MoS2 with up to 8 min of UV-O3 exposure. Density functional theory (DFT) calculations were carried out to provide insight into oxygen-MoS2 interaction mechanisms. Our results showed that the influence of UV-O3 treatment on PL depends on whether the substrate is present, as well as the number of layers. Additionally, 4 min of UV-O3 treatment was found to be optimal to produce p-type MoS2, while maintaining above 80% of the PL intensity and the emission wavelength, compared to pristine flakes (intrinsically n-type). UV-O3 treatment for more than 6 min not only caused a reduction in the electron density but also deteriorated the hole-dominated transport. It is revealed that the substrate plays a critical role in the manipulation of the electrical and optical properties of MoS2, which should be considered in future device fabrication and applications. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano13233034
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        Text: English
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        Type: general
      – SubjectFull: Optical properties
        Type: general
      – SubjectFull: Surface cleaning
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      – SubjectFull: Density functional theory
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      – SubjectFull: Electron density
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      – SubjectFull: Molybdenum disulfide
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      – TitleFull: Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS 2.
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            – D: 01
              M: 12
              Text: Dec2023
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              Y: 2023
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