Chemical Vapor Sensing with Monolayer MoS2

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...

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Bibliographic Details
Published in:Nano letters 2013-02, Vol.13 (2), p.668-673
Main Authors: Perkins, F. K, Friedman, A. L, Cobas, E, Campbell, P. M, Jernigan, G. G, Jonker, B. T
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Electronics
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Materials science
Molecular electronics, nanoelectronics
Nanoscale materials and structures: fabrication and characterization
Nanotubes
Physics
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
Specific materials
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Summary: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.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl3043079