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

Research output: Contribution to journalArticlepeer-review

20 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 MoOx.

Original languageEnglish (US)
Pages (from-to)271-274
Number of pages4
JournalMicro and Nano Letters
Volume12
Issue number4
DOIs
StatePublished - Apr 1 2017

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Biomedical Engineering
  • General Materials Science
  • Condensed Matter Physics

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