Lateral MoS2 Heterostructure for Sensing Small Gas Molecules
Lateral MoS2 Heterostructure for Sensing Small Gas Molecules
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DOI：
10.1021/acsaelm.9b00495
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发表时间：
2020-01-01
影响因子：
4.7
通讯作者：
Fyta, Maria
中科院分区：
文献类型：
--
作者：
Schleicher, Moritz;Fyta, Maria
二维（2D）二硫化钼（MoS 2）的横向异质结构在传感小气体分子的潜力正在评估的基础上的量子力学计算。这种异质结构结合了两个相的MoS 2，即嵌入半导体MoS 2相内的金属带。在这项工作中，由于气体分子的吸附对这种二维材料的电子结构的影响进行了研究。具体而言，NO，NO2，O-2，CO，和CO2上的二硫化钼异质结构的吸附进行了研究。总体而言，可以清楚地揭示2D材料的电子特征中的气体特异性峰，同时也发现了靠近材料界面的气体吸附的差异。“有毒”的氮氧化物分子在材料上表现出更强的吸附性，但可以很好地与“健康”的分子氧气区分开来。异质结构的复杂性提供了比单相材料更丰富的气体吸附特性，并且因此预期由于增加的统计和可以施加的栅极电压的更宽窗口而显示出增强的灵敏度。这项工作提供了一个证明的高度相关性的2D二硫化钼异质结构的气体探测器中的响应材料的原则。
The potential of a two-dimensional (2D) molybdenum disulfide (MoS2) lateral heterostructure in sensing small gas molecules is being assessed on the basis of quantum mechanical calculations. This heterostructure combines two phases of MoS2, namely, a metallic ribbon embedded within the semiconducting MoS2 phase. In this work the influence on the electronic structure of this 2D material due to the adsorption of gas molecules is investigated. Specifically, the adsorption of NO, NO2, O-2, CO, and CO2 on the MoS2 heterostructure is studied. Overall, gas-specific peaks in the electronic features of the 2D material could be clearly revealed, while differences were also found for a gas adsorption close to the interfaces of the material. The "poisonous" nitrogen oxide molecules showed a stronger adsorption on the material but could very well be distinguished over the "healthy" molecular oxygen gas. The complexity of the heterostructure provides more rich gas adsorption characteristics over the single-phase material and is thereby expected to show an enhanced sensitivity due to the increased statistics and the wider window of gate voltages that can be applied. This work provides a proof of principles on the high relevance of the 2D MoS2 heterostructure in view of response materials in gas detectors.