用DFT和NAP-XPS分析的WS2气体传感器的探测机制
Tomoya Minezaki1, Peter Krüger1, Fatima Ezahra Annanouch2
1Department of Materials Science, Graduate School of Science and Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba-shi 263-8522, Chiba, Japan.
Sensors (Basel, Switzerland)
|July 11, 2023
概括
纳米结构的二硫化物 (WS2) 显示出对气传感器的前景. 这项研究揭示了通过室温的物理吸收和更高温度的化学吸收相互作用,解释了传感器电阻的变化.
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.
- 纳米技术纳米技术
背景情况:
- 纳米结构的二硫化 (WS2) 是化学阻力气体传感器的关键材料.
- WS2表现出室温气反应,使其成为传感应用的吸引力.
研究的目的:
- 阐明纳米结构WS2的探测机制.
- 用先进的光谱和计算方法研究与WS2表面的相互作用.
主要方法:
- 近环境压力X射线光电子光谱 (NAP-XPS) 用于分析表面相互作用.
- 密度函数理论 (DFT) 计算以建模吸附和电子性能.
主要成果:
- NAP-XPS表示WS2在室温下对的物理吸收和150°C以上的化学吸收.
- DFT揭示了在无缺陷的WS2上物理吸附气,但在硫缺陷时化学结合.
- 在硫缺陷处的吸附会诱导显著的电荷转移,并改变隙状态.
结论:
- 该研究阐明了WS2上的双重吸附机制.
- 这些发现解释了在与WS2相互作用时气体传感器阻力观察到的增加.
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