Structural changes in bulk MoS2 as a consequence of 1.5 MeV proton micro beam irradiation

• Published in: Indian journal of physics 2023-12, Vol.97 (14), p.4155-4159
• Main Authors: Kumar, Ram, Singh, Sheshamani, Paul, Barnita, Kelkar, Aditya H., Shukla, Neeraj
• Format: Article
• Language: English
• Subjects: Astrophysics and Astroparticles; Defects; Density; Flakes (defects); Fluence; Irradiation; Microbeams; Molybdenum disulfide; Multilayers; Original Paper; Physics; Physics and Astronomy; Proton beams; Vibration mode; X-ray diffraction
• ISSN: 0973-1458; 0974-9845
• DOI: 10.1007/s12648-023-02738-4

This article provides an overview of the structural changes in bulk MoS 2 flakes, post irradiation with 1.5 MeV proton micro beam. We have irradiated multilayer MoS 2 flakes, with 1.5 MeV proton micro beam in the fluence range 15–2135 pC/µm 2 . The fluence has been varied at constant flux and energy in the quest of the optimized defect density. The impact of micro beam irradiation on the sample, has been assessed by Raman measurement. We have observed significant changes in the E 2g 1 and A 1g Raman vibrational modes of MoS 2 flakes post irradiation. The X-ray diffraction (XRD) studies demonstrate that there are systematic and significant structural changes in the MoS 2 flakes, due to 1.5 MeV proton micro beam irradiation. The XRD findings reveals that the formation of double phase takes place, with 706 pC/µm 2 of proton micro beam fluence at 1.5 MeV and beyond. Theoretical simulation to assess the defect density have been performed using stopping range of ions in matter software.