Two dimensional (2D) materials are the ideal choice for highly efficient, lightweight, low power consumption nanoelectronics in space science applications. Therefore, investigation of radiation hardness of 2D-materials is of great interest. Herein, we report the effect of gamma irradiation on chemical vapor deposition (CVD) synthesized crystalline monolayer (1 L) molybdenum disulfide (MoS₂) flakes on the sapphire substrate at various doses, viz., 1–1000 kGy. We estimated that the temperature of MoS₂ increases by 1.3 C per kGy of gamma-ray dose. It was observed that up to 130 kGy (∼195 C), gamma exposure has no significant impact on the morphology and chemical properties of MoS₂. However, X-ray photoelectron spectroscopy (XPS) shows that from 275 kGy (∼385 C), MoS₂ starts converting into MoO_x. Raman spectroscopy shows that at low gamma doses, the crystallinity of MoS₂ increases while at higher doses, a traceable amount of MoS₂ starts converting into amorphous MoS₃. Our findings show that both E¹ _2g and A_1g Raman mode of MoS₂ blue shift as gamma dose increases owing to the combined effect of sulfur vacancies creation and strain caused by thermal expansion of MoS₂.

二维 (2D) 材料是空间科学应用中高效、轻量、低功耗纳米电子学的理想选择。因此，研究二维材料的辐射硬度具有重要意义。在此，我们报告了伽马辐射对不同剂量（即 1–1000 kGy ）的化学气相沉积 (CVD) 合成晶体单层 (1 L) 二硫化钼 (MoS ₂ ) 薄片在蓝宝石衬底上的影响。我们估计 MoS ₂的温度每 kGy 伽马射线剂量增加 1.3 C。据观察，高达 130 kGy (∼195 C)，伽马暴露对 MoS ₂的形态和化学性质没有显着影响. 然而，X 射线光电子能谱 (XPS) 表明，从 275 kGy (∼385 C)开始，MoS ₂开始转化为 MoO _x。拉曼光谱显示，在低伽马剂量下，MoS ₂的结晶度增加，而在较高剂量下，可追踪量的 MoS ₂开始转化为无定形 MoS ₃。我们的研究结果表明，由于硫空位的产生和由 MoS _{2 的}热膨胀引起的应变的综合影响，MoS _{2 的}E ¹ _2g和 A _1g拉曼模式随着伽马剂量的增加而发生蓝移。