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Gamma rays impact on 2D-MoS2 in water solution.

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  • 1Department of Advanced Biomedical Sciences, University of Naples, Federico II, Naples, Italy.

Scientific Reports
|September 27, 2024
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This study reveals that ionizing radiation in water alters molybdenum disulfide (MoS2) nanoflakes, changing molybdenum

Keywords:
68Ga irradiation2D NSsBinding energyDeconvolutionLPEPositron annihilation

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Area of Science:

  • Materials Science
  • Radiation Chemistry
  • Nanotechnology

Background:

  • Two-dimensional transition metal dichalcogenides like molybdenum disulfide (MoS2) have potential applications in aerospace, radiation therapy, and biosciences.
  • Understanding MoS2 behavior in aqueous environments under ionizing radiation is crucial for these applications.

Purpose of the Study:

  • To investigate the effects of low-dose 511 keV photon irradiation on MoS2 nanoflakes in an aqueous solution.
  • To determine the role of water radiolysis products in the observed changes to MoS2.

Main Methods:

  • Experimental monitoring using SEM microscopy, DLS, Raman and UV-vis spectroscopy, AFM, and X-ray photoelectron spectroscopy.
  • Radiation transport Monte Carlo simulations to model photon interactions and radiolysis.
  • Irradiation of MoS2 nanoflakes in water with 511 keV photons.

Main Results:

  • Ionizing radiation induces morphological and spectroscopical changes in MoS2 nanoflakes.
  • Radiolysis of water generates reactive species that significantly impact MoS2.
  • The molybdenum oxidation state shifts from stable +4 and +6 to unstable +5.

Conclusions:

  • Water radiolysis plays a critical role in the radiation-induced alterations of MoS2 nanoflakes.
  • The observed changes in oxidation state have implications for the use of MoS2 in medical and aerospace applications.
  • Findings are relevant for radiation therapies, diagnostics, and biomedical research in space environments.