Physisorption-Based Charge Transfer in Two-Dimensional SnS2 for Selective and Reversible NO2 Gas Sensing
Physisorption-Based Charge Transfer in Two-Dimensional SnS2 for Selective and Reversible NO2 Gas Sensing
复制标题
用于选择性和可逆 NO2 气体传感的二维 SnS2 中基于物理吸附的电荷转移
DOI：
10.1021/acsnano.5b04343
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发表时间：
2015-10-01
期刊：
影响因子：
17.1
通讯作者：
Kalantar-zadeh, Kourosh
中科院分区：
文献类型：
--
作者：
Ou, Jian Zhen;Ge, Wanyin;Kalantar-zadeh, Kourosh
二氧化氮(NO2)是一种气体，在某些工业、农业和医疗保健部门发挥着重要作用。然而，在低检测下限下，尤其是在存在其他干扰气体的情况下，NO2的检测仍然面临着巨大的挑战。当前气敏技术的NO2选择性与它们的灵敏度和可逆性以及制造和操作成本之间存在显著的权衡。在这项工作中，我们展示了一种基于物理吸附的NO2气体分子和二维二硫化锡(SnS2)片之间的电荷转移的经济传感平台，从而在选择性和可逆NO2传感方面取得了重要进展。该器件在低于160℃的工作温度下对NO2表现出高的灵敏度和优越的选择性，远低于选择性差得多的化学吸附和离子导电NO2传感器。同时，该传感器具有良好的可逆性，这是其他2D材料中很少观察到的。这种令人印象深刻的特征源于二维SnS2的平面形貌以及这种材料独特的物理亲和力和有利的电子能带位置，这有助于在十亿分之一的水平上促进NO2的物理吸附和电荷转移。基于二维SnS2的传感器为低成本和选择性的NO2气体传感提供了真正的解决方案。
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 degrees 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.