在环境X射线辐射下,在WS2和WSe2中的剂量解析氧气被动化和空隙形成
Jiaran Li1, Wenfa Chen1, Xiaoyue Wu1
1Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, State Key Laboratory of Mechanics and Control of Mechanical Structures, and Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
ACS applied materials & interfaces
|December 2, 2025
概括
二化物 (WQ2) 中的缺陷化学影响了在X射线暴露下的光学特性. 氧气被动化通过减轻辐射损伤来增强排放,为改善设备稳定性提供了一种策略.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术纳米技术
背景情况:
- 缺陷化学显著影响像WQ2 (Q = S, Se) 这样的二维过渡金属二甲基化物 (TMD) 的光学反应.
- 环境氧气和电离辐射对TMD光学性能的联合影响尚不清楚.
研究的目的:
- 在空气中的X射线照射下,研究单层和双层WQ2的剂量解析光学演变.
- 阐明缺陷化学和氧气替代在辐射耐受性和光学辐射中的作用.
主要方法:
- 拉曼光谱和光发光 (PL) 光谱被用来跟踪WQ2的变化.
- 在空气中进行X射线照射,并监测累积剂量变化.
- 原子力显微镜 (AFM) 评估了地形变化.
- 使用第一原则计算来合理化实验观测.
主要成果:
- 观察到光学属性的非单调演变:在低剂量时蓝移和强度增加,随后在较高剂量时红移和减弱.
- 过渡剂量取决于石化物 (Se或S) 和层厚度 (单层或双层).
- 氧气替代被发现可以使缺陷被动化,增强排放并缩小带隙,而没有显著的地形变化.
结论:
- 原子薄的WQ2对X射线辐射具有化学依赖性和厚度依赖性耐受性.
- 氧气在抑制缺陷,增强光学辐射和防止不可逆转的辐射损伤方面发挥着至关重要的作用.
- 结合实验和理论方法,提供了一种通过氧辅助被动化来改善TMD中的光学辐射的策略.
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