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

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

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Author(s): Burcu Ozden ¹ ; Min P. Khanal ¹ ; Juhong Park ² ; Sunil Uprety ¹ ; Vahid Mirkhani ¹ ; Kosala Yapabandara ¹ ; Kyunghyuk Kim ¹ ; Marcelo Kuroda ¹ ; Michael J. Bozack ¹ ; Wonbong Choi ² ; Minseo Park ¹
- Affiliations: 1: Department of Physics, Auburn University, Auburn, AL 36849, USA ;
  2: Department of Materials Science and Engineering, Mechanical and Energy Engineering, University of North Texas, 1155 Union Circle #305310, Denton, TX 76203-5017, USA
Source: Volume 12, Issue 4, April 2017, p. 271 – 274
DOI: 10.1049/mnl.2016.0712 , Online ISSN 1750-0443

Received 03/11/2016, Accepted 20/12/2016, Published 01/04/2017

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 E _2g ¹ and A _1g modes after irradiation. XPS revealed that the MoS₂ crystal structure was converted to molybdenum oxide (MoO _x ). It is hypothesised that S vacancies are formed due to the γ-ray irradiation, which subsequently transforms MoS₂ to MoO _x .

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

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