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

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.