title: Physisorption-Based Charge Transfer in Two-Dimensional SnS2 for Selective and Reversible NO2 Gas Sensing.
abstract: 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.
authors.affiliation: School of Electrical and Computer Engineering, RMIT University , Melbourne, VIC 3000, Australia.
authors.forename: Jian Zhen
authors.initials: JZ
authors.lastname: Ou
authors.affiliation: The Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences , 200050 Shanghai, P.R. China.
authors.forename: Wanyin
authors.initials: W
authors.lastname: Ge
authors.affiliation: School of Electrical and Computer Engineering, RMIT University , Melbourne, VIC 3000, Australia.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Carey
authors.affiliation: School of Electrical and Computer Engineering, RMIT University , Melbourne, VIC 3000, Australia.
authors.forename: Torben
authors.initials: T
authors.lastname: Daeneke
authors.affiliation: School of Electrical and Computer Engineering, RMIT University , Melbourne, VIC 3000, Australia.
authors.forename: Asaf
authors.initials: A
authors.lastname: Rotbart
authors.affiliation: The Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences , 200050 Shanghai, P.R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Shan
authors.affiliation: School of Electrical and Computer Engineering, RMIT University , Melbourne, VIC 3000, Australia.
authors.forename: Yichao
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Physical Science and Technology, ShanghaiTech University , 200031 Shanghai, P.R. China.
authors.forename: Zhengqian
authors.initials: Z
authors.lastname: Fu
authors.affiliation: School of Electrical and Computer Engineering, RMIT University , Melbourne, VIC 3000, Australia.
authors.forename: Adam F
authors.initials: AF
authors.lastname: Chrimes
authors.affiliation: School of Electrical and Computer Engineering, RMIT University , Melbourne, VIC 3000, Australia.
authors.forename: Wojtek
authors.initials: W
authors.lastname: Wlodarski
authors.affiliation: School of Applied Sciences, RMIT University , Melbourne, VIC 3000 Australia.
authors.forename: Salvy P
authors.initials: SP
authors.lastname: Russo
authors.affiliation: School of Electrical and Computer Engineering, RMIT University , Melbourne, VIC 3000, Australia.|The Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences , 200050 Shanghai, P.R. China.|School of Physical Science and Technology, ShanghaiTech University , 200031 Shanghai, P.R. China.
authors.forename: Yong Xiang
authors.initials: YX
authors.lastname: Li
authors.affiliation: School of Electrical and Computer Engineering, RMIT University , Melbourne, VIC 3000, Australia.
authors.forename: Kourosh
authors.initials: K
authors.lastname: Kalantar-Zadeh
keywords: SnS2; gas sensor; nanosheet; physisorption; post-transition metal dichalcogenide; two-dimensional materials