Data from: Physisorption-based charge transfer in two-dimensional SnS2 for selective and reversible NO2 gas sensing

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Nitrogen dioxide (NO2) is a gas species that plays an important role in certain industrial, farming, and healthcare sectors. However, there are still significant challenges for NO2 sensing at low detection limits, especially in the presence of other interfering gases. The NO2 selectivity of current gas-sensing technologies is significantly traded-off with their sensitivity and reversibility as well as fabrication and operating costs. In this work, we present an important progress for selective and reversible NO2 sensing by demonstrating an economical sensing platform based on the charge transfer between physisorbed NO2 gas molecules and two-dimensional (2D) tin disulfide (SnS2) flakes at low operating temperatures. The device shows high sensitivity and superior selectivity to NO2 at operating temperatures of less than 160 °C, which are well below those of chemisorptive and ion conductive NO2 sensors with much poorer selectivity. At the same time, excellent reversibility of the sensor is demonstrated, which has rarely been observed in other 2D material counterparts. Such impressive features originate from the planar morphology of 2D SnS2 as well as unique physical affinity and favorable electronic band positions of this material that facilitate the NO2 physisorption and charge transfer at parts per billion levels. The 2D SnS2-based sensor provides a real solution for low-cost and selective NO2 gas sensing.

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二氧化氮（Nitrogen dioxide，NO₂）是一种气体组分，在部分工业、农业及医疗领域发挥着重要作用。然而，实现低检出限的NO₂传感仍面临诸多严峻挑战，尤其是在存在其他干扰气体的场景下。当前气体传感技术的NO₂选择性，往往需要在灵敏度、可逆性以及制备与运行成本之间做出显著权衡。

本研究展示了选择性与可逆性兼备的NO₂传感领域的一项重要进展：我们开发了一种经济高效的传感平台，其基于低运行温度下物理吸附的NO₂气体分子与二维二硫化锡（tin disulfide，2D SnS₂）薄片之间的电荷转移机制。

该器件在低于160℃的运行温度下即可展现出对NO₂的高灵敏度与优异选择性，这一温度远低于化学吸附型及离子传导型NO₂传感器的运行温度，而后者的选择性往往较差。

与此同时，该传感器还展现出优异的可逆性，这一特性在其他二维材料基传感器中鲜有报道。

这些优异性能源于二维SnS₂的平面形貌，以及该材料独特的物理吸附亲和力与适宜的电子能带结构，这些特性可在十亿分之一（parts per billion，ppb）级别促进NO₂的物理吸附与电荷转移过程。

基于二维SnS₂的传感器为低成本、高选择性的NO₂气体传感提供了切实可行的解决方案。