Chemical Vapor Sensing with Monolayer MoS2

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• 作者：F. K. Perkins ; A. L. Friedman ; E. Cobas ; P. M. Campbell ; G. G. Jernigan ; B. T. Jonker
• 刊名：Nano Letters
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：13
• 期：2
• 页码：668-673
• 全文大小：404K
• 年卷期：v.13,no.2(February 13, 2013)
• ISSN：1530-6992

文摘

Two-dimensional materials such as graphene show great potential for future nanoscale electronic devices. The high surface-to-volume ratio is a natural asset for applications such as chemical sensing, where perturbations to the surface resulting in charge redistribution are readily manifested in the transport characteristics. Here we show that single monolayer MoS₂ functions effectively as a chemical sensor, exhibiting highly selective reactivity to a range of analytes and providing sensitive transduction of transient surface physisorption events to the conductance of the monolayer channel. We find strong response upon exposure to triethylamine, a decomposition product of the V-series nerve gas agents. We discuss these results in the context of analyte/sensor interaction in which the analyte serves as either an electron donor or acceptor, producing a temporary charge perturbation of the sensor material. We find highly selective response to electron donors and little response to electron acceptors, consistent with the weak n-type character of our MoS₂. The MoS₂ sensor exhibits a much higher selectivity than carbon nanotube-based sensors.
<h4>Keywords: h4> Chemical sensor; MoS₂; molybdenum disulfide; two-dimensional materials; vapor sensing