Physisorption-Based Charge Transfer in Two-Dimensional SnS2 for Selective and Reversible NO2 Gas Sensing

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• 作者：Jian Zhen Ou ; Wanyin Ge ; Benjamin Carey ; Torben Daeneke ; Asaf Rotbart ; Wei Shan ; Yichao Wang ; Zhengqian Fu ; Adam F. Chrimes ; Wojtek Wlodarski ; Salvy P. Russo ; Yong Xiang Li ; Kourosh Kalantar-zadeh
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：October 27, 2015
• 年：2015
• 卷：9
• 期：10
• 页码：10313-10323
• 全文大小：730K
• ISSN：1936-086X

文摘

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 掳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.