Raman and X-ray photoelectron spectroscopy investigation of the effect of gamma-ray irradiation on MoS2

Burcu Ozden; Min P. Khanal; Juhong Park; Sunil Uprety; Vahid Mirkhani; Kosala Yapabandara; Kyunghyuk Kim; Marcelo Kuroda; Michael J. Bozack; Wonbong Choi; Minseo Park

doi:10.1049/mnl.2016.0712

Raman and X-ray photoelectron spectroscopy investigation of the effect of gamma-ray irradiation on MoS₂

Burcu Ozden, Min P. Khanal, Juhong Park, Sunil Uprety, Vahid Mirkhani, Kosala Yapabandara, Kyunghyuk Kim, Marcelo Kuroda, Michael J. Bozack, Wonbong Choi, Minseo Park

Division of Engineering and Science (Abington)

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

The effect of gamma-ray (γ-ray) irradiation on the material characteristics of nanometre scale films of molybdenum disulphide (MoS₂) has been investigated. 3.2, 4.5, and 5.2 nm thick MoS₂ films (measured by atomic force microscopy) were grown on Si by using a two-step synthesis method (sputtering of Mo, followed by sulphurisation). The samples were subsequently exposed to γ-ray irradiation (dose of 120 MRad). Dramatic chemical changes in the MoS₂ films after irradiation were characterised by micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and optical microscopy. Micro-Raman spectroscopy showed the disappearance of the E2 1g and A1g modes after irradiation. XPS revealed that the MoS₂ crystal structure was converted to molybdenum oxide (MoOx). It is hypothesised that S vacancies are formed due to the γ-ray irradiation, which subsequently transforms MoS₂ to MoO_x.

Original language	English (US)
Pages (from-to)	271-274
Number of pages	4
Journal	Micro and Nano Letters
Volume	12
Issue number	4
DOIs	https://doi.org/10.1049/mnl.2016.0712
State	Published - Apr 1 2017

All Science Journal Classification (ASJC) codes

Bioengineering
Biomedical Engineering
General Materials Science
Condensed Matter Physics

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title = "Raman and X-ray photoelectron spectroscopy investigation of the effect of gamma-ray irradiation on MoS2",

abstract = "The effect of gamma-ray (γ-ray) irradiation on the material characteristics of nanometre scale films of molybdenum disulphide (MoS2) has been investigated. 3.2, 4.5, and 5.2 nm thick MoS2 films (measured by atomic force microscopy) were grown on Si by using a two-step synthesis method (sputtering of Mo, followed by sulphurisation). The samples were subsequently exposed to γ-ray irradiation (dose of 120 MRad). Dramatic chemical changes in the MoS2 films after irradiation were characterised by micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and optical microscopy. Micro-Raman spectroscopy showed the disappearance of the E2 1g and A1g modes after irradiation. XPS revealed that the MoS2 crystal structure was converted to molybdenum oxide (MoOx). It is hypothesised that S vacancies are formed due to the γ-ray irradiation, which subsequently transforms MoS2 to MoOx.",

author = "Burcu Ozden and Khanal, {Min P.} and Juhong Park and Sunil Uprety and Vahid Mirkhani and Kosala Yapabandara and Kyunghyuk Kim and Marcelo Kuroda and Bozack, {Michael J.} and Wonbong Choi and Minseo Park",

note = "Publisher Copyright: {\textcopyright} 2016 The Institution of Engineering and Technology.",

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doi = "10.1049/mnl.2016.0712",

language = "English (US)",

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T1 - Raman and X-ray photoelectron spectroscopy investigation of the effect of gamma-ray irradiation on MoS2

AU - Ozden, Burcu

AU - Khanal, Min P.

AU - Park, Juhong

AU - Uprety, Sunil

AU - Mirkhani, Vahid

AU - Yapabandara, Kosala

AU - Kim, Kyunghyuk

AU - Kuroda, Marcelo

AU - Bozack, Michael J.

AU - Choi, Wonbong

AU - Park, Minseo

PY - 2017/4/1

Y1 - 2017/4/1

N2 - The effect of gamma-ray (γ-ray) irradiation on the material characteristics of nanometre scale films of molybdenum disulphide (MoS2) has been investigated. 3.2, 4.5, and 5.2 nm thick MoS2 films (measured by atomic force microscopy) were grown on Si by using a two-step synthesis method (sputtering of Mo, followed by sulphurisation). The samples were subsequently exposed to γ-ray irradiation (dose of 120 MRad). Dramatic chemical changes in the MoS2 films after irradiation were characterised by micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and optical microscopy. Micro-Raman spectroscopy showed the disappearance of the E2 1g and A1g modes after irradiation. XPS revealed that the MoS2 crystal structure was converted to molybdenum oxide (MoOx). It is hypothesised that S vacancies are formed due to the γ-ray irradiation, which subsequently transforms MoS2 to MoOx.

AB - The effect of gamma-ray (γ-ray) irradiation on the material characteristics of nanometre scale films of molybdenum disulphide (MoS2) has been investigated. 3.2, 4.5, and 5.2 nm thick MoS2 films (measured by atomic force microscopy) were grown on Si by using a two-step synthesis method (sputtering of Mo, followed by sulphurisation). The samples were subsequently exposed to γ-ray irradiation (dose of 120 MRad). Dramatic chemical changes in the MoS2 films after irradiation were characterised by micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and optical microscopy. Micro-Raman spectroscopy showed the disappearance of the E2 1g and A1g modes after irradiation. XPS revealed that the MoS2 crystal structure was converted to molybdenum oxide (MoOx). It is hypothesised that S vacancies are formed due to the γ-ray irradiation, which subsequently transforms MoS2 to MoOx.

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Raman and X-ray photoelectron spectroscopy investigation of the effect of gamma-ray irradiation on MoS₂

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