Gamma rays impact on 2D-MoS2 in water solution

Two-dimensional transition metal dichalcogenides, particularly MoS<sub>2</sub>, are interesting materials for many applications in aerospace research, radiation therapy and bioscience more in general. Since in many of these applications MoS<sub>2</sub>-based nanomaterials can be placed in an aqueous environment while exposed to ionizing radiation, both experimental and theoretical studies of their behaviour under these conditions is particularly interesting. Here, we study the effects of tiny imparted doses of 511 keV photons to MoS<sub>2</sub> nanoflakes in water solution. To the best of our knowledge, this is the first study in which ionizing radiation on 2D-MoS<sub>2</sub> occurs in water. Interestingly, we find that, in addition to the direct interaction between high-energy photons and nanoflakes, reactive chemical species, generated by γ-photons induced radiolysis of water, come into play a relevant role. A radiation transport Monte Carlo simulation allowed determining the elements driving the morphological and spectroscopical changes of 2D-MoS<sub>2</sub>, experimentally monitored by SEM microscopy, DLS, Raman and UV-vis spectroscopy, AFM, and X-ray photoelectron techniques. Our study demonstrates that radiolysis products affect the Molybdenum oxidation state, which is massively changed from the stable + 4 and + 6 states into the rarer and more unstable + 5. These findings will be relevant for radiation-based therapies and diagnostics in patients that are assuming drugs or contrast agents containing 2D-MoS<sub>2</sub> and for aerospace biomedical applications of 2DMs investigating their actions into living organisms on space station or satellites.

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Publication Details

Journal
Scientific Reports
Published
2024-09-27
DOI
https://doi.org/10.1038/s41598-024-69410-7
Citations
3
Primary Topic
2D Materials and Applications
Type
article
Field-Weighted Citation Impact
0.35
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Gamma rays impact on 2D-MoS2 in water solution

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Gamma rays impact on 2D-MoS2 in water solution

Manjot Singh, Manuela Rossi, Mohammadhassan Valadan, Giulia Rusciano, Davide Bianco, Paolo A. Netti, Mariarosaria Panico, Chiara Feoli, Antonio Sasso, Maria Rosaria Del Sorbo, Stefania Clemente, Angela Capaccio, C. Altucci, Edmondo Battista, Carmela Nappi, Jasneet Kaur, Alberto Cuocolo, Jaber Adam
article en
3 citations

Abstract

Two-dimensional transition metal dichalcogenides, particularly MoS<sub>2</sub>, are interesting materials for many applications in aerospace research, radiation therapy and bioscience more in general. Since in many of these applications MoS<sub>2</sub>-based nanomaterials can be placed in an aqueous environment while exposed to ionizing radiation, both experimental and theoretical studies of their behaviour under these conditions is particularly interesting. Here, we study the effects of tiny imparted doses of 511 keV photons to MoS<sub>2</sub> nanoflakes in water solution. To the best of our knowledge, this is the first study in which ionizing radiation on 2D-MoS<sub>2</sub> occurs in water. Interestingly, we find that, in addition to the direct interaction between high-energy photons and nanoflakes, reactive chemical species, generated by γ-photons induced radiolysis of water, come into play a relevant role. A radiation transport Monte Carlo simulation allowed determining the elements driving the morphological and spectroscopical changes of 2D-MoS<sub>2</sub>, experimentally monitored by SEM microscopy, DLS, Raman and UV-vis spectroscopy, AFM, and X-ray photoelectron techniques. Our study demonstrates that radiolysis products affect the Molybdenum oxidation state, which is massively changed from the stable + 4 and + 6 states into the rarer and more unstable + 5. These findings will be relevant for radiation-based therapies and diagnostics in patients that are assuming drugs or contrast agents containing 2D-MoS<sub>2</sub> and for aerospace biomedical applications of 2DMs investigating their actions into living organisms on space station or satellites.

Scientific ReportsVol. 14(1)
Istituto Nazionale di Fisica Nucleare (IT), University of Campania "Luigi Vanvitelli" (IT), Italian Aerospace Research Centre (IT), University of Chieti-Pescara (IT), Center for Advanced Biomaterials for Healthcare (IT), Superconducting and other Innovative Materials and Devices Institute (IT), Institute of Biosciences and Bioresources (IT), Federico II University Hospital (IT), National Cancer Institute (MY), Institute of Biostructure and Bioimaging (IT), Institute of Intelligent Systems for Automation (IT), University of Naples Federico II (IT)
Openalex Percentile: Top 44%
2D Materials and Applications
0.35
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