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Lateral MoS2 Heterostructure for Sensing Small Gas Molecules
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2019-12-23 , DOI: 10.1021/acsaelm.9b00495
Moritz Schleicher 1 , Maria Fyta 1
Affiliation  

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, O2, 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.

中文翻译:

侧向MoS 2异质结构,用于感知小气体分子

正在基于量子力学计算评估二维(2D)二硫化钼(MoS 2)横向异质结构在检测小气体分子中的潜力。该异质结构结合了MoS 2的两个相,即嵌入在半导体MoS 2相中的金属带。在这项工作中,研究了由于气体分子的吸附而对这种2D材料的电子结构的影响。具体地,NO,NO 2,O 2,CO和CO 2在MoS 2上的吸附。研究了异质结构。总体而言,可以清楚地显示2D材料电子特征中特定于气体的峰,同时还发现了接近材料界面的气体吸附差异。“有毒”的氮氧化物分子在材料上显示出更强的吸附能力,但与“健康”的分子氧气体相比却非常有区别。异质结构的复杂性在单相材料上提供了更丰富的气体吸附特性,因此由于统计量的增加和可以施加的栅极电压窗口的增加,有望表现出更高的灵敏度。鉴于气体检测器中的响应材料,这项工作为二维MoS 2异质结构的高度相关性提供了原理证明。
更新日期:2020-01-06
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