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Updated: Jun 29, 2025

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关于WS₂,WSe₂和WTe₂单层氧化易感性的第一原则研究

Ashima Rawat¹, Lokanath Patra², Ravindra Pandey¹

¹Department of Physics, Michigan Technological University, Houghton, MI, 49931, USA. arawat2@mtu.edu.

|March 26, 2024

概括

像WS2,WSe2和WTe2这样的二维过渡金属二化物单层显示出出色的环境稳定性. 它们抵御氧气分子和原子氧的氧化,确保它们适用于电子和能源设备.

科学领域:

材料科学材料科学材料科学
表面科学是一门学科.
计算化学的计算化学

背景情况:

双维 (2D) 过渡金属二二原化单层对于先进的电子,光子和储能应用至关重要.
它们的环境稳定性,特别是对抗氧气暴露,对于设备的寿命和性能至关重要.

研究的目的:

调查WS2,WSe2和WTe2单层对各种形式的氧气暴露的敏感性.
了解吸附机制以及氧化后由此产生的结构和电子变化.

主要方法:

用密度函数理论计算对范德瓦尔斯相互作用进行了校正.
模拟分析了单层上原子氧,O2和O3分子的吸附.
过渡路径计算确定了氧化过程中的能量障碍.

主要成果:

O2和O3分子的物理吸收弱,保持单层结构和电子特性.
原子氧化学吸收器具有显著的电荷转移.
氧气接近的高能量屏障解释了光诱导的氧化.
WS2 的氧化改变了其电子结构,减少了带间隙.

结论:

WS2,WSe2和WTe2单层对氧气暴露具有显著的弹性.
这些二维材料在含有氧气的环境中是稳定的,支持它们在实际设备中的使用.

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相关概念视频

Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.